Identify The Intermolecular Forces Present In Water And Dichloromethane

Hydrogen bonding is the second strongest intermolecular force, followed by dipole-dipole interactions. For the three pairs of compounds in the second column,. Principle(s) Investigated: Surface Tension, Cohesion, Adhesion, van der Walls forces, dipole-dipole forces, hydrogen bonding, hydrophobic materials, surfactants, emulsifiers, spheres Standards:. 2 Intermolecular Forces • Intermolecular forces are weaker than bonds, but have profound effects on the properties of liquids • Polar liquids have a higher boiling point and higher heat of vaporization than non-polar liquids. Identify the correct intermolecular force for each of the following descriptions. a) 2-propanone and ethyl ethanoate (ethyl acetate) b) pentane and octane. The intermolecular forces that are present in caffeine are London dispersion forces and Dipole-dipole forces. None of the above. The strongest intermolecular force in water is a special dipole bond called the hydrogen bond. Identify a chemical bond as ionic, covalent or metallic in a compound. The intermolecular forces of water are based on the covalent bonds in the water molecules. Chapter 1 Dipole Moments, Molecular Polarity and Intermolecular Forces. Compound H Intermolecular Forces Dispersion Force Dipole-Dipole Force ydrogen bonding Cl 2 + HBr - + NH 3 - - + -CH 3. • Water is high because of additional H-bonds Heat of Fusion • Energy is needed to melt substances: this is an endothermic process. Dispersion forces are found in all substances. Here are the questions: Identify and discuss two different structural features that would account for solubility in methylene chloride (hint: think intermolecular forces). For example, only 16 kJ/mol is required to overcome the intermolecular attractions between HCl molecules in liquid HCl in order to vaporize it. indicate how the intermolecular forces arise and which is most important. The intermolecular forces depend on the following interactions: Dipole-dipole interactions: Dipole -dipole interactions are the attractive forces among the polar molecules. Identify the most significant intermolecular force in each substance. Molecules that can hydrogen bond, such as ethylene glycol, have a much lower equilibrium vapor. Practice Test Questions 9. The more kinetic energy, the weaker the intermolecular forces. C) Energy is given off when the attraction between two molecules is broken. (d) In terms of intermolecular forces, explain why dichloromethane has a higher vapor pressure than carbon. In order of decreasing strength, the types of intermolecular bonds in covalent substances are: Hydrogen bonds Dipole-dipole attractions Dipole-induced dipole attractions London dispersion forces You start at the top and work down. If we compare the boiling points of methane (CH 4 ) -161ºC, ammonia (NH 3 ) -33ºC, water (H 2 O) 100ºC and hydrogen fluoride (HF) 19ºC, we see a greater variation for these similar sized molecules than expected from the data presented. The intermolecular forces of water are based on the covalent bonds in the water molecules. Note that the diagram on the left only shows intermolecular forces. Covalent compounds exhibit van der Waals intermolecular forces that form bonds of various strengths with other covalent compounds. Justify your answer in terms of the intermolecular forces present in each compound. If given a set of molecules, you should first identify the type of intermolecular interaction present in each molecule. ; Intermolecular forces are weaker than intramolecular forces. Extra Practice Problems 1. Intermolecular attractive forces, collectively referred to as van der Waals forces, are responsible for the behavior of liquids and solids and are electrostatic in nature. Organic Chemistry (CHEM 545). Intermolecular Forces Proceedings of the Fourteenth Jerusalem Symposium on Quantum Chemistry and Biochemistry Held in Jerusalem, Israel, April 13–16, 1981. 2 Intermolecular Forces. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. 450) In which of the following substances is hydrogen bonding likely to play an important role in determining physical properties: methane (CH 4), hydrazine (H 2NNH 2), methyl fluoride (CH. Another helium nearby, then, would have a dipole induced in it, as the electrons on the left side of helium atom 2 repel the electrons in the cloud on helium atom 1. Pre Test – Big Idea 2 {chap 8,9,10}. Although such induced moments vary in magnitude, in principle, an electric. Chemistry 101 ANSWER KEY 1 REVIEW QUESTIONS Chapter 11 1. they will surround the more electronegative atom in the bond). The boiling point of H 2 S is 213 K. Let us help you simplify your studying. Substance Dispersion Forces Dipole-Dipole Forces Hydrogen Bonding Br2 PCl3 BF3 C2H5OH Compare and contrast intermolecular forces and intramolecular forces. List all types of IMFs that would occur in each of the following (you should have a good. As a result, CH2C12 has a greater solubility. Names_____ Chemistry Group Work: Intermolecular Forces For questions 1-5: a) Draw the 3-D Lewis structures, showing any polar bonds with + and - symbols in the appropriate location. Effects of Intermolecular Forces: The strength of intermolecular forces present in a substance is related to the boiling point and melting point of the substance. An alcohol molecule can be compared to a water molecule. The way to recognize when hydrogen bonding is present as opposed to just dipole-dipole is to see what the hydrogen is bonded to. Question 3 Describe the intermolecular forces present in each of the following solutions: a. b answer because of the fact of hydrogen bonding between the patial + charge of hydrogen and partial adverse charge of oxygen. The ion-solvent interactions are the intermolecular interactions that intervene between a solute ionic and a solvent (polar or non-polar). Your answer should include: a description of all the intermolecular forces present for each compound; the relative strengths of the intermolecular forces present. e) methanol and ethanoic acid. Intermolecular Forces, Liquids, and Solids. C) Energy is given off when the attraction between two molecules is broken. This dipole-dipole bonding is showing the positive hydrogen bonding with the negative from the oxygen. Separately consider the two atoms highlighted with an arrow in the molecule shown below. properly in your explanations. ( $\mathbf{d}$ ) All other factors being the same, dispersion forces between linear molecules are greater than those between molecules whose shapes are nearly spherical. MSJChem – Topic 4 – Intermolecular forces Intermolecular forces 1) Arrange the following in terms of increasing strength: Hydrogen bonding London dispersion forces Dipole-dipole forces 2) Identify the strongest type of intermolecular forces in the following molecules: a) Cl 2 f) CH 3 Cl b) HCl g) H 2 O c) HF h) CH 3 OH d) CH 4 i) C 2 H 6 e. Solutions to Problem Assignment 6 (Intermolecular Forces) 1. Intermolecular forces. Dispersion Forces • Weakest intermolecular forces • Present in all molecules • Electrons are not always evenly distributed around atoms or molecules –Temporary dipoles • Dispersion forces increase with the number of electrons atoms and molecules • Although individual LD forces are small, in large molecules the effect can be large. London dispersion forces are present in all molecules and are directly proportional to molecular size. and which are nonpolar. Water has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces. Ideal mixtures and intermolecular forces. Identify the intermolecular forces present in water and dichloromethane. According to my thoughts, among the 4 IMFs I know: London dispersion. Rank the lattice energy (ionic bond strength) for the following formulas, 1 being strongest:. a) London-dispersion forces Xe in nonpolar, and methanol is an organic compound with low polarity. 02/08/2008. OK, let's review the kinds of intermolecular forces you can have: 1. Due Wednesday, Jan. List the following from lowest to highest boiling point: water. CH 3OH and C 6H 6 c. Read and learn for free about the following article: Intramolecular and intermolecular forces If you're seeing this message, it means we're having trouble loading external resources on our website. Intermolecular Forces, Liquids, and Solids - 1 - Chapter 11. Dipole:dipole forces depend on size of molecular dipoles; energy range 5-25 kJ mol -1. Intermolecular Forces 4 types of intermolecular forces: ion-dipole forces (mostly in solutions of ionic compound dissolved in polar solvent) and van der Waal’s forces which include dipole-dipole forces, London dispersion forces and hydrogen bonding understand when the different forces are present and their relative strengths flow chart for determining which types of intermolecular forces are present in substances Liquids. The first force, London dispersion, is also the weakest. A force present in all substances with electrons is the dispersion force An intermolecular force caused by the instantaneous position of an electron in a molecule. Intermolecular Forces, Liquids, and Solids. 9°C F 2 −188. The most significant intermolecular force for this substance would be dispersion forces. List all types of IMFs that would occur in each of the following (you should have a good. The vapour pressure of methylcyclohexane and toluene are 4. For the best answers, search on this site https://shorturl. ; Intermolecular forces are weaker than intramolecular forces. KCl: Ionic attractions because the hydrated K+ and Cl- ions exhibit coulombic forces of attraction. a Students know atoms combine to form molecules by sharing electrons to form covalent or metallic bonds or by exchanging electrons to form ionic bonds. Intermolecular Forces 2012. Identify the strongest intermolecular force present in pure samples of the following substances: SO 2 (like water, SO 2 is a bent molecule) H 2 O CH 2 Cl 2. Summary of Intermolecular Forces Figure 10. They are London dispersion, dipole-dipole and the hydrogen bond. 2 Intermolecular Forces • Intermolecular forces are much weaker than ionic or covalent bonds (e. If a substance has one type of intermolecular bond, it has all the other forces. (c) In terms of the total attractive forces for a given substance, dipole-dipole interactions, when present, are always greater than dispersion forces. 7°C H 2S −60. small amounts of water. Chapter 11 Homework 11. C12H26 (oil) H2O (water) Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. The molecular weight of each compound is shown. Lower viscosity, faster flow. Interpretation: Identify the intermolecular forces that must be overcome to perform the following statement of melt ice. !Identify the type of intermolecular force (London dispersion force, weak/strong dipole-dipole force, or hydrogen bond) pointed to in each interaction. 4a: Identify the intermolecular forces present in hydrogen iodide in the liquid state, HI(l). A force present in all substances with electrons is the dispersion force An intermolecular force caused by the instantaneous position of an electron in a molecule. Explain the relation between the intermolecular forces present within a. answer in terms of the intermolecular forces present in each compound. 10) What type of intermolecular force causes the dissolution of NaCl in water? C) ion-dipole force: 11) Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. Indicate which intermolecular forces are present in the following substances by checking the. Intermolecular Forces, Liquids & Solids 3 • Dipole-induced dipole—the force of attraction between a polar molecule and a nonpolar molecule. Boiling point generally increases with molecular weight due to increased strength of dispersion forces. Let us look at the following examples to get a better understanding of it. • Melting or boiling = broken intermolecular forces. CH 3NH 2 16. Give complete explanations. What forces (dipole-dipole, hydrogen bonds, or dispersion forces) are present in each sample?. A) strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other. Summary of Chemistry Textbook: Section 2. Read and learn for free about the following article: Intramolecular and intermolecular forces If you're seeing this message, it means we're having trouble loading external resources on our website. University. A) Cl2: 12) Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force. For each compound listed below, identify the intermolecular forces present. C12H26 (oil) H2O (water) Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. The intermolecular forces of the remaining substances depend on molecular weight, polarity, and hydrogen bonding. Solids do in fact have vapor pressures, but the ionic structure of this salt makes it very low. This quiz involves the forces of attraction between particles, and the connection to macroscopic physical properties, like physical state and solubility. the intermolecular forces present in methanol are hydrogen bond between the oxygen and hydrogen part of the molecule and van der waals forces between the carbon and hydrogen part of the molecule. The three types of van der Waals forces include: 1) dispersion (weak), 2) dipole-dipole (medium), and 3) hydrogen (strong). Intermolecular forces Molecules cohere even though their ability to form chemical bonds has been satisfied. Solvent Observations After Mixing Soluble?. • They are the forces that give water it's surface tension. 18, boils at 125°C as compared to water, which boils at 100°C. The molecular interactions, thus, are dipole - dipole. Intermolecular Forces: Applying What You Know. 124-IIIF n-octanol and water a) Identify the predominant type of intermolecular force for each compound based on its structure and complete the table on the Discussion page. Intermolecular forces. 7 Advanced Materials. Non-polar bonds, or more specifically, temporary dipole-dipole bonds. 33) which is immiscible with water, it is widely used as a solvent, a paint stripper, and for the removal of caffeine from coffee and tea. Identify the types of intermolecular forces experienced by specific molecules based on their structures; Explain the relation between the intermolecular forces present within a substance and the temperatures associated with changes in its physical state; Distinguish between adhesive and cohesive forces. MSJChem – Topic 4 – Intermolecular forces Intermolecular forces 1) Arrange the following in terms of increasing strength: Hydrogen bonding London dispersion forces Dipole-dipole forces 2) Identify the strongest type of intermolecular forces in the following molecules: a) Cl 2 f) CH 3 Cl b) HCl g) H 2 O c) HF h) CH 3 OH d) CH 4 i) C 2 H 6 e. To understand this process at the molecular level, we must apply the three steps we previously discussed. Zumdahl #16. b) The intermolecular forces of attractions within a sample of NaF are mainly dipole-dipoles. i) liquid methane. 1331 - CHAPTER 11 QUESTIONS IGNORE QUESTIONS 3, 10, 37 onwards Intermolecular Forces 1. Need to identify all the intermolecular forces involved in a solution of bromine water e. , 16 kJ/mol versus 431 kJ/mol for HCl). 2 Quantitative Aspects of Phase Changes 12. !Hydrogen bond. Intermolecular Forces: Applying What You Know. Be familiar with the range of intermolecular forces, especially hydrogen bonding, ion-dipole forces and dispersion forces. Intermolecular attractive forces are small relative to the bonding forces (intramolecular) between atoms. • They are the forces that break when going from a solid to a liquid or a liquid to a gas. Dispersion forces are caused by the motion of electrons, and it causes temporary poles. 2016 AP Chemistry - Intermolecular Forces. In nature, there may be one or more than one intermolecular forces that may act on a molecule. Determine the kinds of intermolecular forces that are present in each element or compound: a. In a liquid, the molecules are very close to one another and are constantly moving and colliding. The three types of van der Waals forces include: 1) dispersion (weak), 2) dipole-dipole (medium), and 3) hydrogen (strong). indicate how the intermolecular forces arise and which is most important. F = k q1 q2 r2 E = k q1 q2 r Because Energy = Force x Distance +-k depends on medium (kair = 9. the partial positive side of another molecule. The covalent bonds (interatomic forces) are between. If given a set of molecules, you should first identify the type of intermolecular interaction present in each molecule. doc Intermolecular Forces Intermolecular forces are the forces of attraction between molecules which cause liquids and solids to form. This lab supports students’ understanding of Intermolecular Forces; Molecular Structure. Boiling point generally increases with molecular weight due to increased strength of dispersion forces. Explain the following phenomena in terms of intermolecular forces at the particle level: The surface tension of water is greater than that of acetone. Ion-dipole bonds (ionic species to covalent molecules). Titanium tetrachloride is the inorganic compound with the formula TiCl 4. In process 1, hydrogen bonds (or dipole-dipole interactions) in liquid water are overcome to produce distinct water molecules in the vapor phase. 7 which means there are ionic forces of attraction present not dipole-dipoles. Chapter 11 Liquids, solids, and intermolecular forces. Use your understanding of intermolecular forces to explain why but-2-en-l-ol has a higher boiling temperature than I -bromobut-2-ene. Types of intermolecular forces. Hydrogen bonding is the main effectual intermolecular rigidity interior of NH2CH3 as not basically does it hydrogen bond interior of it self yet additionally helps Nitrogen to have a lone pair with helps with London-Dispersion Forces. The strength of these forces increases with the magnitude of the dipole of the polar molecule and with the polarizibility of the nonpolar molecule. That's because it is a stronger type of intermolecular force than the alternatives of ionic bonding (there are no ions) and hydrogen bonding (the only stronger intermolecular force) are not. Example: Identify the types of intermolecular forces that are present in each of the following substances and select the substance in each pair that has the highest boiling point: A) C 4 H 10 or C 8 H 18 B) CH 3 OCH 3 or NH 2 NH 2 C) CH 3 CH 2 OH or CH 3 CH 2 SH. Check your textbook for a complete list, try a few questions on the subject and then come back with specific questions if you have any. 4a: Identify the intermolecular forces present in hydrogen iodide in the liquid state, HI(l). Hydrogen bonding occurs when the partially negative oxygen end of one of the molecules is attracted to the partially positive hydrogen end of another molecule. Ion-dipole forces 2. Dispersion forces are present in all atoms and molecules; energy range from 0. H 2 S is a gas at room temperature while water is a liquid! No FON, no Hydrogen. Again, because of the similarity in intermolecular interactions, the solid is able to dissolve into the solvent forming a homogeneous solution. Explain the following phenomena in terms of intermolecular forces at the particle level: The surface tension of water is greater than that of acetone. According to the theory of _____ dissolves _____ compounds with the same intermolecular force or polarity will dissolve into each other. The positive end of one molecule is attracted to the negative end of the adjacent molecule. Chemistry Grades 9-12. Molecules attract each other, and the force of attraction increases rapidly as the intermolecular distance decreases. Hydrogen bonds are the strongest of all intermolecular forces. The three types of van der Waals forces include: 1) dispersion (weak), 2) dipole-dipole (medium), and 3) hydrogen (strong). 40℃, d = 1. They have to be overcome to decompose a substance. Molecules cohere even though their ability to form chemical bonds has been satisfied. Intermolecular Forces, Liquids & Solids 3 • Dipole-induced dipole—the force of attraction between a polar molecule and a nonpolar molecule. For the following intermolecular forces: a. Effects of Intermolecular Forces: The strength of intermolecular forces present in a substance is related to the boiling point and melting point of the substance. (sometimes called the London dispersion force , after the physicist Fritz London, who first described this force in the early 1900s). But of course, it's not an actual intramolecular force. they will surround the more electronegative atom in the bond). Recognize that the greater the intermolecular forces, the higher the boiling point and lower the vapor pressure. Intermolecular Forces. part of the overall molecule, so dispersion forces are assumed to be the main intermolecular interactions. interacts with water via dipolefinduced dipole forces or LDFs, which would be weaker. 8: Intermolecular and covalent bonds (interatomic forces) in water. 2 Intermolecular Forces • Intermolecular forces are weaker than bonds, but have profound effects on the properties of liquids • Polar liquids have a higher boiling point and higher heat of vaporization than non-polar liquids. Identify the main type of intermolecular force between molecules of the type shown above. These charged ends can attract other water molecules. smaller ion will bond more closely to water's dipole, allowing for a stronger …. they will surround the more electronegative atom in the bond). Specific Learning Outcomes » compare the properties of liquids and solids with those of gases » apply the kinetic molecular theory to describe liquids and solids » describe the various intermolecular forces and factors that affect their strengths » identify the types of intermolecular forces that. dipole-dipole - this when different atoms in the same compound have electronegativities that are pretty different, causing a permanent shift in how the electrons are distributed (i. A student adds 2 ml, of H20 and 2 ml, of C6H14 to a test tube. Dipole-Dipole Force, London Dispersion forces, and hydrogen bonding forces. Driving factor for intermolecular forces is Coulomb’s law!!!! Positive and negative charges attract!!!. Explain the relation between the intermolecular forces present within a. They are responsible for the chemical properties of matter. The type of molecule/ion determines the type of intermolecular force. However, a dominant intermolecular force may be sufficient to describe or rank physical properties such as melting point, boiling point, vapor pressure, and enthalpy of vaporization. London dispersion forces, dipole dipole, and hydrogen bonding are all present between glucose molecules. If it is a cis isomer, then the strongest attraction will be dipole-dipole, but if it is a trans isomer, then there will be no dipole, and it will. The intermolecular forces of the remaining substances depend on molecular weight, polarity, and hydrogen bonding. The intermolecular forces in iodine (solid at room temperature) are considerably strong compared to the other halogens. Water = H-O-H Alcohol = R-O-H. • Remember that IMFs are additive! This is why we only mention the strongest type of force present, and assume all weaker ones are also present. (Choose one). Sample Exercise 11. , 16 kJ/mol versus 431 kJ/mol for HCl). The most significant intermolecular force for this substance would be dispersion forces. 4 Properties of the Liquid State 12. David Geelan. Intermolecular (or interparticle ) forces are weak interactions between particles. ( $\mathbf{d}$ ) All other factors being the same, dispersion forces between linear molecules are greater than those between molecules whose shapes are nearly spherical. Then, identify the strongest intermolecular force present in pure samples of the following substances: SO 2 H 2 O CH 2 Cl 2 dipole-dipole forces hydrogen bonds dipole-dipole forces. Intermolecular forces are weak relative to intramolecular forces - the forces which hold a molecule together. Hydrogen bonding is the main effectual intermolecular rigidity interior of NH2CH3 as not basically does it hydrogen bond interior of it self yet additionally helps Nitrogen to have a lone pair with helps with London-Dispersion Forces. Humans have about 24,000 different proteins w hich catalyze chemical reactions, recognize foreign molecules and pathogens, allow. Explain 15. ; Intermolecular forces are weaker than intramolecular forces. OK, let's review the kinds of intermolecular forces you can have: 1. Remember, the prefix inter means between. And what we want to think about is what happens when you try to essentially dissolve these salts in water. Note that the diagram on the left only shows intermolecular forces. Intermolecular Forces, Liquids, and Solids. Dispersion Forces • Weakest intermolecular forces • Present in all molecules • Electrons are not always evenly distributed around atoms or molecules –Temporary dipoles • Dispersion forces increase with the number of electrons atoms and molecules • Although individual LD forces are small, in large molecules the effect can be large. Intermolecular Forces 2012. Dichloromethane is a member of the class of chloromethanes that is methane in which two of the hydrogens have been replaced by chlorine. Solvent Observations After Mixing Soluble?. They have to be overcome to decompose a substance. Melting point, boiling point, crystal lattice, miscibility, solubility, etc. 1331 - CHAPTER 11 QUESTIONS IGNORE QUESTIONS 3, 10, 37 onwards Intermolecular Forces 1. C12H26 (oil) H2O (water) Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Weak attraction between instantaneous dipoles. Compound H Intermolecular Forces Dispersion Force Dipole-Dipole Force ydrogen bonding Cl 2 + HBr – + NH 3 – – + –CH 3. Then, using your results, any other relevant observations, and the predictions you made of the liquids’ behaviors, you will try to identify which liquid is which. Water has higher molar heat of vaporization than hexane. London dispersion forces, dipole dipole, and hydrogen bonding are all present between glucose molecules. Rank the lattice energy (ionic bond strength) for the following formulas, 1 being strongest:. Sodium chloride (NaCl) dissolves when water molecules continuously attack the NaCl crystal, pulling away the individual sodium (Na +) and chloride (Cl –) ions. Intermolecular Forces: The forces of attraction/repulsion between molecules. Give an example of each and describe what characteristic that example has that results in each type of intermolecular force. Ion-dipole forces 2. Intermolecular Forces of Attraction are forces of attraction between unlike charges, partially positive and negative dipoles, that occur between two molecules. F = k q1 q2 r2 E = k q1 q2 r Because Energy = Force x Distance +-k depends on medium (kair = 9. London Dispersion Forces These forces are present in all molecules, whether they are polar or nonpolar. C 3 H 8; CH 3 OH; H 2 S; Solution. Compound H Intermolecular Forces Dispersion Force Dipole-Dipole Force ydrogen bonding Cl 2 + HBr - + NH 3 - - + -CH 3. • They are the forces that break when going from a solid to a liquid or a liquid to a gas. Ion-dipole forces are the forces responsible for the solvation of ionic compounds in aqueous solutions, and are the strongest of the intermolecular foces. Hello I have a few problems with figuring out intermolecular forces between interactions of caffeine and water/ caffeine and methylene chloride (DCM) for my lab. Identify the strongest intermolecular force operating in the condensed phases of the following substances. As the intermolecular forces increase (↑), the boiling point increases (↑). Note that we will use the popular phrase "intermolecular attraction" to refer to attractive forces between the particles of a substance, regardless of whether these. dipole-dipole forces hydrogen bonds dipole-dipole forces. These forces are collectively known as Van der Waals forces. The stronger the intermolecular forces in a substance (A) the higher the boiling point. D) London forces and dipole-dipole interactions E) none of these 3. For the best answers, search on this site https://shorturl. The relative strength of the intermolecular force A drawing (diagram/ model) of the force B. Although such induced moments vary in magnitude, in principle, an electric. Identify the IMFA present in water, ethanol and kerosene. Substance B is brittle, does not conduct electricity as a solid but does when molten, and has a melting point of 2072 °C. 450) In which of the following substances is hydrogen bonding likely to play an important role in determining Identify the intermolecular forces present in the following substances, and. 450) In which of the following substances is hydrogen bonding likely to play an important role in determining physical properties: methane (CH 4), hydrazine (H 2NNH 2), methyl fluoride (CH. dipole-dipole - this when different atoms in the same compound have electronegativities that are pretty different, causing a permanent shift in how the electrons are distributed (i. For molecules to be held together by London Dispersion Forces, it must be possible to INDUCE an electric dipole moment in the molecule with an electric field. Dispersion forces are found in all substances. London Dispersion Forces. The energy required to break molecules apart is much smaller than a typical bond-energy, but intermolecular forces play important roles in determining the properties of a substances. Part (c) asked students to examine the Lewis electron-dot diagrams of dichloromethane and carbon tetrachloride and to use intermolecular forces to explain why dichloromethane is more soluble than carbon tetrachloride. Identify the most significant intermolecular force in each substance. Rank the lattice energy (ionic bond strength) for the following formulas, 1 being strongest:. •Force between polar molecules. Intermolecular Forces: Applying What You Know. The attractive forces must be greater than the repulsive forces, leading to micelle formation. Based on the solubility data you obtained in Part C , predict what intermolecular forces might be present in your unknown. This lab supports students' understanding of Intermolecular Forces; Molecular Structure. The most significant intermolecular force for this substance would be dispersion forces. dipole-dipole - this when different atoms in the same compound have electronegativities that are pretty different, causing a permanent shift in how the electrons are distributed (i. London dispersion forces are present in all molecules and are directly proportional to molecular size. 124-IIIF n-octanol and water a) Identify the predominant type of intermolecular force for each compound based on its structure and complete the table on the Discussion page. 33) which is immiscible with water, it is widely used as a solvent, a paint stripper, and for the removal of caffeine from coffee and tea. Which statement about London dispersion forces is incorrect? They result from asymmetric distribution of electrons. Intermolecular forces are much weaker than the intramolecular forces that hold the molecules together, but they are still strong enough to influence the properties of a substance. In part (d) students explained why. Water has lower viscosity than hexane. OBJECTIVE (S): Students will be able to: 1. With the exception of ionic compounds, the words polar and nonpolar only pertain to MOLECULAR substances and the difference between them dictates the strength and type of IMF. • They are the attraction that holds water into its liquid and solid shape. Identify the most significant intermolecular force in each substance. TERMINOLOGIES Intermolecular forces of attraction- •a force of attraction between molecules Dipole-dipole- •Stronger than London dispersion. This molecule has an H atom bonded to an O atom, so it will experience hydrogen bonding. 2 Intermolecular Forces • Intermolecular forces are weaker than bonds, but have profound effects on the properties of liquids • Polar liquids have a higher boiling point and higher heat of vaporization than non-polar liquids. They are present in polar molecules. University of South Florida. The first is London Dispersion. Intermolecular Forces Acting on Water Water is a polar molecule, with two +δ hydrogen atoms that are covalently attached to a -δ oxygen atom. Explain, in terms of intermolecular forces, why water and octane are not miscible. In a liquid, the molecules are very close to one another and are constantly moving and colliding. • They are the attraction that holds water into its liquid and solid shape. Molecules cohere even though their ability to form chemical bonds has been satisfied. Substance B is brittle, does not conduct electricity as a solid but does when molten, and has a melting point of 2072 °C. Hint: Think about what intermolecular forces should be present to have a boiling point that is this high AND what covalent bonds are necessary in the molecule for it to have these intermolecular forces. Which of the following that can form hydrogen bonds with water molecules? A. C 3 H 8; CH 3 OH; H 2 S; Solution. Stronger intermolecular forces usually correlate with higher boiling points. For example, the covalent bond, involving sharing electron. Multiple-Choice 1) The predominant intermolecular force in (CH3)2NH is: A) London-dispersion forces B) ion-dipole attractions C) hydrogen bonding D) dipole-dipole attractions 2) London. Water is a great example of hydrogen bonding. 5 The Uniqueness of Water 12. The strongest intermolecular force. b) The intermolecular forces of attractions within a sample of NaF are mainly dipole-dipoles. The blade do not exert enough force to pierce the surface of water, so it floats over the surface of water. The picture on the right of the hydrogen bonding is a great illustration of how an ether does not have hydrogen bonding with other ethers. For CH 4, C 2 H 6 and C 3 H 8: a. Problem SP9. b) dipole-dipole and London-dispersion forces. CH 3OH I 2. You may find it useful to draw Lewis structures to find your answer. That's because it is a stronger type of intermolecular force than the alternatives of ionic bonding (there are no ions) and hydrogen bonding (the only stronger intermolecular force) are not. Identify the most significant intermolecular force in each substance. Covalent compounds exhibit van der Waals intermolecular forces that form bonds of various strengths with other covalent compounds. The strongest intermolecular force. An experiment is performed to compare the solubilities of 12(s) in different solvents, water and hexane (C6H14). London dispersion forces. Intermolecular (or interparticle ) forces are weak interactions between particles. In an alcohol molecule, the hydroxyl oxygen and the two atoms bonded to it are all in the same plane and have a bond angle of approximately 104 o. For example, the covalent bond, involving sharing electron. Chapter 10 Intermolecular Forces 7 The Phases of Water 8 Phase Changes • A solid can be converted into a liquid by heating, and to a gas by heating or reducing the pressure: Propane (C 3 H 8) is stored in tanks at pressures above 2. A) hydrogen bonds B) London dispersion forces C) intermolecular forces D) intramolecular forces E) dispersion forces 4. Surface tension of. dipole-dipole forces dipole-dipole forces London dispersion forces 2. Define each type of intermolecular force below. Ion-induced dipole forces 3. Then, identify the strongest intermolecular force present in pure samples of the following substances: SO 2 H 2 O CH 2 Cl 2 dipole-dipole forces hydrogen bonds dipole-dipole forces. Example: Identify the types of intermolecular forces that are present in each of the following substances and select the substance in each pair that has the highest boiling point: A) C 4 H 10 or C 8 H 18 B) CH 3 OCH 3 or NH 2 NH 2 C) CH 3 CH 2 OH or CH 3 CH 2 SH. In an alcohol molecule, the hydroxyl oxygen and the two atoms bonded to it are all in the same plane and have a bond angle of approximately 104 o. In contrast, intramolecular forces act within molecules. The forces of attraction between neutral molecules owing to dipole moments or induced dipole moments are called van der Waals forces. PART 1: INTERMOLECULAR FORCES IN LIQUIDS AND GASES. All intermolecular forces are van der Waals forces; that is, they are not true bonds in the sense of sharing or transferring electrons, but are weaker attractive forces. Determine the kinds of intermolecular forces that are present in each of the following elements or compounds: a. The type of molecule/ion determines the type of intermolecular force. Hydrogen bonding forces occurs in a particularly special group of polar compounds. A liquid with weak intermolecular forces will have a relatively large amount of vapor (gas phase) present above its surface. CH 2 Cl 2: Intermolecular forces will depend on the isomer present. For nonpolar species, London dispersion forces are their only intermolecular forces. Draw Lewis Structures for various compounds, predict the molecular geometry and determine if it is polar or nonpolar. In process 1, hydrogen bonds (or dipole-dipole interactions) in liquid water are overcome to produce distinct water molecules in the vapor phase. How do intermolecular forces relate to the physical properties of substances? You will examine several physical properties of three liquids: water, ethanol, and cyclohexane. According to the theory of _____ dissolves _____ compounds with the same intermolecular force or polarity will dissolve into each other. Identify the most significant intermolecular force in each substance. Which statement about London dispersion forces is incorrect? They result from asymmetric distribution of electrons. Solids do in fact have vapor pressures, but the ionic structure of this salt makes it very low. 1 Intermolecular Forces and Solubility Activity Sheet V1. It is important to consider the solvent as a reaction. For CH 4, C 2 H 6 and C 3 H 8: a. 2018 _____ To satisfy the minimum requirements for this course, you should be able to: 1. Describe how they work on the submicroscopic level and give an example of a substance that has these forces present. Species Present Strongest Type. with the aid of distruption of intermolecular forces that exist in water upon freezing. For each compound listed below, identify the intermolecular forces present. London Dispersion force. hydrogen bonding C. the intermolecular forces present in methanol are hydrogen bond between the oxygen and hydrogen part of the molecule and van der waals forces between the carbon and hydrogen part of the molecule. Intermolecular Forces Worksheet Answers 1)Using your knowledge of molecular structure, identify the main intermolecular force in the following compounds. Choose from: dispersion, dipole-dipole, and/or hydrogen bonding (The answer may have one, two, or all three of the choices - but I already tried all three and it was wrong). H 2 O is a polar molecule, with hydrogen bonded to an electronegative atom, oxygen. CH 3NH 2 16. Substance Dispersion Forces Dipole-Dipole Forces Hydrogen Bonding Br2 PCl3 BF3 C2H5OH Compare and contrast intermolecular forces and intramolecular forces. Determine the kinds of intermolecular forces that are present in each element or compound: a. So the bonds within the molecules (intramolecular forces) must be stronger. 'Like dissolves like' rule: substances with a given polarity (intermolecular force) tend. Effects of Intermolecular Forces: The strength of intermolecular forces present in a substance is related to the boiling point and melting point of the substance. OK, let's review the kinds of intermolecular forces you can have: 1. Intermolecular Forces, Ionic bond strength, Phase Diagrams, Heating Curves. EXAMPLE: Identify the intermolecular forces present in both the solute and the solvent, and predict whether a solution will form between the two. London Dispersion forces D. Molecules cohere even though their ability to form chemical bonds has been satisfied. Ions of opposite charge, such as in a crystal of NaCl, are attracted to each other because of electrostatic forces. they will surround the more electronegative atom in the bond). Water moves through a xylem tube which is an incredibly small space for substances to pass through. HO CH3 CH3 CH3 CH3 CH3 O OH trans-Oleic Acid cholesterol cis-Oleic Acid Figure 3. Intermolecular Forces Proceedings of the Fourteenth Jerusalem Symposium on Quantum Chemistry and Biochemistry Held in Jerusalem, Israel, April 13–16, 1981. Answer the following questions using principles of molecular structure and intermolecular forces. (a) XeF2 (b) SO2 (c) NO2+ (d) SO2𝐶𝐶𝐶𝐶2. Hexane has a lower boiling point than water. Summary of Chemistry Textbook: Section 2. Intermolecular Forces, Liquids, and Solids. University. OK, let's review the kinds of intermolecular forces you can have: 1. Intermolecular forces can have a profound effect on the physical characteristics of a chemical species. Ions of opposite charge, such as in a crystal of NaCl, are attracted to each other because of electrostatic forces. C12H26 (oil) H2O (water) Identify the types of intermolecular forces found for each of the liquids and relate these to the shape of the drop as seen from the side. Indicate which intermolecular forces are present in the following substances by checking the appropriate boxes. (c) The shapes of the molecules of hydrogen sulfide and water are similar, yet Explain. a) London-dispersion forces Xe in nonpolar, and methanol is an organic compound with low polarity. dipole-dipole interactions hydrogen bonding dispersion forces. Although C–H bonds are polar, they are only minimally polar. Intermolecular Forces, Liquids & Solids 3 • Dipole-induced dipole—the force of attraction between a polar molecule and a nonpolar molecule. 2 points are earned for a rationale that references the types of IMFs between each compound and water. ; Intermolecular forces are weaker than intramolecular forces. Here are the formulas for the energy of each interaction. Identify the intermolecular forces present in water and dichloromethane. CH4 ii) a mixture of water and methanol (CH3OH) iii) a solution of bromine in water in each mixturem. This affects many of the measurable physical properties of substances: If molecules stick together more, they'll be tougher to break apart. 2 Intermolecular Forces • Intermolecular forces are much weaker than ionic or covalent bonds (e. Everyone has learned that there are three states of matter - solids, liquids, and gases. ions in aqueous solution! As intermolecular forces increase:! • Vapor pressure decreases, it is more difficult for molecules to leave the liquid !. Intermolecular forces attract molecules to each other, making them less likely to flow. Identify the type of intramolecular force for each compound. Since it is polar, CH3OCH3 also has dipole-dipole forces. This molecule has an H atom bonded to an O atom, so it will experience hydrogen bonding. Evaporation and Intermolecular Attractions OBJECTIVES: • Explore the relationship between intermolecular forces and rate of evaporation • Relate intermolecular forces to molecular structure DISCUSSION: Evaporation is an endothermic process: molecules can break free of a liquid-phase system by taking in heat from the surroundings. Polarity, Intermolecular Forces, Kinetic Molecular Theory and Gases. process is related to the strength of the forces holding the molecules in the liquid phase. Experiment 2: Intermolecular Forces Performed: 9/12/2011 Submitted: 9/20/2011 Chemistry 1046L PART I: Purpose: The purpose of partI in this experiment is to identify a variety of unknown substances’ properties using observations of the temperature changes that occur during evaporation. DNA–DNA forces in a DNA condensate are pairwise. 5 The Uniqueness of Water 12. Temperature also affects viscosity. MULTIPLE CHOICE. For the rest of the semester we will be discussing small molecules that are held together by covalent bonds, or ionic bonds. Intermolecular forces attract molecules to each other, making them less likely to flow. University of South Florida. Your answer should include: a description of all the intermolecular forces present for each compound; the relative strengths of the intermolecular forces present. Intermolecular forces make one molecule or ion attract another. Identify the types of the intermolecular forces present in each of the following substance, and select the substance in each pair that had the higher boiling point: (a) C6H14 or C8H18, (b)C3H8 or CH3OCH3, (c) HOOH or HSSH, (d) NH2NH2 or CH3CH3. The intermolecular forces that are present in caffeine are London dispersion forces and Dipole-dipole forces. Describe the types of intermolecular forces possible between atoms or molecules in condensed phases (dispersion forces, dipole-dipole attractions, and hydrogen bonding) Identify the types of intermolecular forces experienced by specific molecules based on their structures. Ion-dipole forces 2. The forces of attraction between neutral molecules owing to dipole moments or induced dipole moments are called van der Waals forces. Polarity of Molecules For a molecule to be polar, it must have polar bonds, and have an unsymmetrical shape Polarity affects the intermolecular forces of attraction and therefore affects boiling points and solubilities as well as the always present induced dipole. and which are nonpolar. Intramolecular Forces: The forces of attraction/repulsion within a molecule. 5 The Uniqueness of Water 12. Explain the following phenomena in terms of intermolecular forces at the particle level: The surface tension of water is greater than that of acetone. Exists in all polar molecules. Explain, in terms of intermolecular forces, why water and octane are not miscible. Chloroform vapor is a anesthetic: James Young Simpson was the first to use chloroform as an anesthetic during childbirth in 1846 (presumably, not on himself!), and it was widely used in surgery in the 19th and early 20th centuries. The only force present in non polar substances and noble gasses. Answer: There are five types of Intermolecular forces 1. Slide 1 Intermolecular Forces Love & Hate in the Molecular Realm The boiling point of water is 373 K. dipole-dipole interactions hydrogen bonding dispersion forces. If a substance has one type of intermolecular bond, it has all the other forces. But when the blade was placed on the surface of the kerosene, it sink. They are responsible for the chemical properties of matter. Interpretation: Identify the intermolecular forces that must be overcome to perform the following statement of melt ice. This dipole-dipole bonding is showing the positive hydrogen bonding with the negative from the oxygen. 7 atm, which turns it into a liquid. • Energy is released upon freezing: this is an exothermic process • The amount of heat transferred (cal or J) per unit mass (grams) is the heat of fusion for a substance. e) methanol and ethanoic acid. The equilibrium vapor pressure does, however, depend very strongly on the temperature and the intermolecular forces present, as shown for several substances in Figure 11. The three types of van der Waals forces include: 1) dispersion (weak), 2) dipole-dipole (medium), and 3) hydrogen (strong). (d) In terms of intermolecular forces, explain why dichloromethane has a higher vapor pressure than carbon. Determine the kinds of intermolecular forces that are present in each element or compound: a. The chemical structure of each chemical is in the table below. The water molecules effectively "squeeze" out the non-polar iodine. Compound H Intermolecular Forces Dispersion Force Dipole-Dipole Force ydrogen bonding Cl 2 + HBr - + NH 3 - - + -CH 3. Weak attraction between instantaneous dipoles. Non-polar bonds, or more specifically, temporary dipole-dipole bonds. !Multiple choice: The electrons pointed to in this water molecule are part of a: a. Head groups can repel each other through steric factors, or ion -ion repulsion from like-charged head groups. • This type of intermolecular force is stronger than typical dipole-dipole interactions. Give complete explanations. The bonds between hydrogen and oxygen within a water molecule can be characterized as _____. Sample Exercise 11. MULTIPLE CHOICE. Steam will assume both the shape and volume of its container and is extremely compressible. • Calculate heat associated with state and temperature changes • Predict intermolecular properties from molecular structure • Predict physical properties of molecules from intermolecular forces. (a) Identify the intermolecular forces present in the following substances and (b) select the substance with the highest boiling point: CH 3 CH 3, CH 3 OH, CH 3 CH 2 OH. Favourite answer. A dense, non-flammible colourless liquid at room temperature (b. In the following description, the term particle will be used to refer to an atom, molecule, or ion. Identify the intermolecular forces present in water and dichloromethane. Identify the most significant intermolecular force in each substance. Identify the intermolecular forces present in the following substances based on the shape of the compound and. Intramolecular. 28 Identify the type or types of intermolecular forces present in each substance and then select the substance in each pair that has the higher boiling point: (a) propane C 3 H 8 or n-butane C 4 H 10, (b) diethyl ether CH 3 CH 2 OCH 2 CH 3 or 1-butanol CH 3 CH 2 CH 2 CH 2 OH, (c) sulfur dioxide SO 2 or sulfur trioxide SO 3, (d) phosgene Cl 2. Rank the following compounds in order of decreasing vapor pressure based on intermolecular forces: a) CH4 b) isopentane C5H12 (2-methyl butane) c) CH3CH2CH2CH2OH d) CH3CH2CH2CH2CH3 you can overlap the choices if they are of the same vapor pressure -if intermolecular force increases, vapor pressure increases -intermolecular forces such as london. Concept Introduction: London dispersion force also called an induced dipole-induced dipole attraction is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. Because the atoms on either side of the covalent bond are the same, the electrons in the covalent bond are shared equally, and the bond is a nonpolar covalent bond. Intermolecular Forces Worksheet Answers 1)Using your knowledge of molecular structure, identify the main intermolecular force in the following compounds. The molecular weight of each compound is shown. org are unblocked. I'd it is due to dipole-dipole attractions. (a) XeF2 (b) SO2 (c) NO2+ (d) SO2𝐶𝐶𝐶𝐶2. ) The greater the strength of the intermolecular forces, the more likely the substance is to be found in a condensed state; i. (Select all that apply. " Stronger intermolecular forces result in higher boiling points, as it requires more energy to break through the. So the bonds within the molecules (intramolecular forces) must be stronger. Hydrogen bonding occurs when the partially negative oxygen end of one of the molecules is attracted to the partially positive hydrogen end of another molecule. Listed below are the various types of intermolecular forces. and which are nonpolar. When CsCl dissolves in water it ionizes forming hydrated Cs+ ions and Cl- ions. Multiple-Choice 1) The predominant intermolecular force in (CH3)2NH is: A) London-dispersion forces B) ion-dipole attractions C) hydrogen bonding D) dipole-dipole attractions 2) London. But when the blade was placed on the surface of the kerosene, it sink. a) London-dispersion forces Xe in nonpolar, and methanol is an organic compound with low polarity. Ion-dipole: Ion-dipole forces are the attractive forces that are present between an ion and a polar molecule. After all, if the molecules in one liquid are held tightly together by a strong intermolecular force, this liquid would be expected to behave differently than a second liquid in which the molecules are. B)use your answers to part (a) to list the solutions in order of increasing strength of interaction present in each. 1331 - CHAPTER 11 QUESTIONS IGNORE QUESTIONS 3, 10, 37 onwards Intermolecular Forces 1. However, we know that in the steam, it is still water (H 2 O). All factors that enhance intermolecular forces (force type, shape and size) will affect viscosity. Intermolecular Force Worksheet Key 1. Determine the kinds of intermolecular forces that are present in each element or compound: a. 3 Electron Configuration; Unit 2 - Molecules. This molecule has an H atom bonded to an O atom, so it will experience hydrogen bonding. Molecules cohere even though their ability to form chemical bonds has been satisfied. The force between polar molecules is known as : dipole-dipole forces: The potential energy of molecules decrease : as they get closer to one aonther: What is the strongest type of intermolecular force present in NH2CH3? The two strands in DNA are held together by _____. Choose from: dispersion, dipole-dipole, and/or hydrogen bonding (The answer may have one, two, or all three of the choices - but I already tried all three and it was wrong). , 16 kJ/mol versus 431 kJ/mol for HCl). a) 2-propanone and ethyl ethanoate (ethyl acetate) b) pentane and octane. Identify the intermolecular forces present in water and dichloromethane. The equilibrium vapor pressure does, however, depend very strongly on the temperature and the intermolecular forces present, as shown for several substances in Figure 11. The type of intermolecular forces ( IMFs) exhibited by compounds can be used to predict whether two different compounds can be mixed to form a homogeneous solution (soluble or miscible). e) Vapor Pressure As the intermolecular forces increase (↑), the vapor pressure decreases (↓). The intermolecular forces present in CH 3 CH 2 OH are: (a) dispersion forces only, (b) dipole-dipole forces only, (c) dispersion forces and dipole-dipole forces only, (d) dispersion forces, dipole-dipole forces, and hydrogen bonding, (e) hydrogen bonding only. Increases in strength as molar mass increases. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. e) Vapor Pressure As the intermolecular forces increase (↑), the vapor pressure decreases (↓). But it is the strongest intermolecular force. So let me draw some liquid water. Rank the following compounds in order of decreasing vapor pressure based on intermolecular forces: a) CH4 b) isopentane C5H12 (2-methyl butane) c) CH3CH2CH2CH2OH d) CH3CH2CH2CH2CH3 you can overlap the choices if they are of the same vapor pressure -if intermolecular force increases, vapor pressure increases -intermolecular forces such as london. A fourth force is an Ion-Dipole Force. Due to the intermolecular forces present in between the molecules of water, the surface of water behave as a stretched membrane. The covalent bonds (interatomic forces) are between. These forces are collectively known as Van der Waals forces. If you are also interested in hydrogen bonding there is a link at the bottom of the page. Hydrogen Bonds In Water Explained - Intermolecular Forces - Duration: 10:54. b) dipole-dipole and London-dispersion forces. Water has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces. London dispersion forces exist in non-polar covalent compounds. The energy required to break molecules apart is much smaller than a typical bond-energy, but intermolecular forces play important roles in determining the properties of a substances. Solutions to Problem Assignment 6 (Intermolecular Forces) 1. Intermolecular Forces, Liquids, and Solids - 1 - Chapter 11. For the best answers, search on this site https://shorturl. Intermolecular Forces. Surface tension. Answer Save. Sodium chloride is a solid salt. I want to study the intermolecular forces (IMFs) in hydrated potassium ion, $\ce{K+ (aq)}$ in an aqueous solution of $\ce{KCl}$. Short Answer: 16. The intermolecular forces case study is a 8 page analysis of data on the melting point, boiling point, vapor pressure, volatility, and surface tension (bulk properties) of 16 different substances. This molecule has an H atom bonded to an O atom, so it will experience hydrogen bonding. !Covalent bond. Identify the types of intermolecular forces experienced by specific molecules based on their structures; Explain the relation between the intermolecular forces present within a substance and the temperatures associated with changes in its physical state; Distinguish between adhesive and cohesive forces. The last force of attraction is hydrogen bonding. London dispersion forces are present in all solutions, but are very small and the. The main types of intermolecular forces include dispersion, hydrogen bonding, and dipole-dipole. Ion-dipole forces are the forces responsible for the solvation of ionic compounds in aqueous solutions, and are the strongest of the intermolecular foces. Make observations and measurements to identify materials based on their properties. they will surround the more electronegative atom in the bond). This affects many of the measurable physical properties of substances: If molecules stick together more, they'll be tougher to break apart. If we compare the boiling points of methane (CH 4 ) -161ºC, ammonia (NH 3 ) -33ºC, water (H 2 O) 100ºC and hydrogen fluoride (HF) 19ºC, we see a greater variation for these similar sized molecules than expected from the data presented. HO CH3 CH3 CH3 CH3 CH3 O OH trans-Oleic Acid cholesterol cis-Oleic Acid Figure 3. Determine the kinds of intermolecular forces that are present in each of the following elements or compounds: a. Learning Objectives. The tendency of an electron cloud to distort in this way is called polarizability. CH 3 CH 2 CH 2 CH 2 OH: Hydrogen bonding because of the presence of the OH group. Weak attraction between instantaneous dipoles. properly in your explanations. Intramolecular.
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