SG_3.1-3.6_TopicQuestions_T.pdf - AP Chemistry Scoring...

This preview shows page 1 - 4 out of 15 pages.

AP Chemistry Scoring Guide 3.1-3.6 Topic Questions Copyright © 2020. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s participation in the program is prohibited. Page 1 of 15 1. The diagram above is a molecular model of a gaseous diatomic element that is just above its boiling point. Intermolecular forces between the gas molecules will cause them to condense into the liquid phase if the temperature is lowered. Which of the following best describes how the model is limited in its depiction of the phenomenon? A It does not show how hydrogen bonds are constantly forming, breaking, and reforming, which results in a net force of attraction between the molecules. B It does not show how the interactions between ions and the induced molecular dipoles result in a net force of attraction between the molecules. C It does not show how the interacting permanent dipoles of the molecules result in a net force of attraction between the molecules. D It does not show how the temporary fluctuating dipoles of the molecular electron clouds result in a net force of attraction between the molecules.
AP Chemistry Scoring Guide 3.1-3.6 Topic Questions Copyright © 2020. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s participation in the program is prohibited. Page 2 of 15 2. Substance Normal boiling point The electron cloud of is smaller than that of , however, has a much higher boiling point than has. Which of the following explains how the dispersion-force model of intermolecular attraction does not account for the unusually high boiling point of ? A is soluble in water, whereas is insoluble in water. B The molecule has a greater mass than the molecule has. C Liquid has weak dispersion force attractions between its molecules, whereas liquid has strong ionic interactions between and ions. D Liquid has weak dispersion force attractions between its molecules, whereas liquid has both weak dispersion force attractions and hydrogen bonding interactions between its molecules. 3. Four different liquid compounds in flasks at are represented above. The table below identifies the compounds. Flask C shows the most particles in the vapor phase. Which of the following is not shown in the model but best helps to explain why flask C must contain pentane? Name Chemical Formula Boiling Point Pentane 36 Hexane 69 Heptane 98 Octane 126
AP Chemistry Scoring Guide 3.1-3.6 Topic Questions Copyright © 2020. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s participation in the program is prohibited. Page 3 of 15 A The random motion of the particles within the liquids B The relative speeds of the vapor particles in each flask C The strength of the intermolecular forces between the particles in the liquids D

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture