5-9 NAME 5. Which of the following molecules has the lowest boiling point? b) CB

Question

5-9

NAME 5. Which of the following molecules has the lowest boiling point? b) CBr c) CF e) a 6. Which of the following types of solids is most likely to be soft, have a low meking point, and not conduct electricity when melted? A. network covalent B. metallic C ionic D. molecular E. none of the above 7. Silver crystallizes in a face-centered cubic unit cell. There are silver atoms per unit ce A. 1 B. 2 C 4 D. 6 E. 8 8. How does the frequency of collisions of the molecules of a gas with the walls of their container change as the amount of gas is decreased at constant temperature and volume? Justify your answer on the basis of the kinetic molecular theory of gases volume container at 25 oC. Now the students want to heat the gas at constant pressure by allowing some of the gas to escape during the heating. How many moles of gas must be released if the temperature is raised to 225 °C 9. A group of chemistry students have injected 0.356 moles of a gas into an evacuated, constant- Exam 3B

Explanation / Answer

Q5

lowest BP --> least polar, least in mass

from the list

choose CH4, since it is the least in mass, 16 g/mol, therefore less in interactions

Q6

molecular speies will be like this, ignore metallic + ionic...

therefore

D

Q7

there is half atom per face,

total faces = 6

total atomst = 6/2 = 3

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