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Part A Under 1 atm of pressure, carbon tetrachloride is a liquid between the temperatures of -23°C and 77 °C, while carbon tetrabromide is a liquid between the temperatures of 95 °C and 190 °C. Which of the following statements explains why CBr4 has higher melting and boiling points than CCl4? i. The attractions between CBг4 molecules are stronger than those between CCL, molecules. ii. Because it has a higher molecular weight, the average kinetic energy of the CBr, molecules at a given temperature is less than the average kinetic energy of the CCl4 molecules at the same temperature. iii. Because chlorine is more electronegative than bromine, CCL will have a larger dipole moment than CBr, and that will lead to greater repulsions between CCl4 molecules. Both i and i O Both i and iii O only i O only iii O only i

Part A Under 1 atm of pressure, carbon tetrachloride is a liquid between the temperatures of -23°C and 77 °C, while carbon tetrabromide is a liquid between the temperatures of 95 °C and 190 °C. Which of the following statements explains why CBr4 has higher melting and boiling points than CCl4? i. The attractions between CBг4 molecules are stronger than those between CCL, molecules. ii. Because it has a higher molecular weight, the average kinetic energy of the CBr, molecules at a given temperature is less than the average kinetic energy of the CCl4 molecules at the same temperature. iii. Because chlorine is more electronegative than bromine, CCL will have a larger dipole moment than CBr, and that will lead to greater repulsions between CCl4 molecules. Both i and i O Both i and iii O only i O only iii O only i

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter9: Liquids And Solids
Section: Chapter Questions
Problem 74QAP
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Part A Under 1 atm of pressure, carbon tetrachloride is a liquid between the temperatures of -23°C and 77 °C, while carbon tetrabromide is a liquid between the temperatures of 95 °C and 190 °C. Which of the following statements explains why CBr4 has higher melting and boiling points than CCl4? i. The attractions between CBг4 molecules are stronger than those between CCL, molecules. ii. Because it has a higher molecular weight, the average kinetic energy of the CBr, molecules at a given temperature is less than the average kinetic energy of the CCl4 molecules at the same temperature. iii. Because chlorine is more electronegative than bromine, CCL will have a larger dipole moment than CBr, and that will lead to greater repulsions between CCl4 molecules. Both i and i O Both i and iii O only i O only iii O only i
Transcribed Image Text:Part A Under 1 atm of pressure, carbon tetrachloride is a liquid between the temperatures of -23°C and 77 °C, while carbon tetrabromide is a liquid between the temperatures of 95 °C and 190 °C. Which of the following statements explains why CBr4 has higher melting and boiling points than CCl4? i. The attractions between CBг4 molecules are stronger than those between CCL, molecules. ii. Because it has a higher molecular weight, the average kinetic energy of the CBr, molecules at a given temperature is less than the average kinetic energy of the CCl4 molecules at the same temperature. iii. Because chlorine is more electronegative than bromine, CCL will have a larger dipole moment than CBr, and that will lead to greater repulsions between CCl4 molecules. Both i and i O Both i and iii O only i O only iii O only i
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