1. © 2015 Pearson Education, Inc. Lynn Mandeltort Auburn University Chapter 10 GASES Give It Some Thought Clicker Questions

2. © 2015 Pearson Education, Inc. a.Yes b.No Xenon is the heaviest stable noble gas with a molar mass of 131 g/mol. Do any of the gases listed in Table 10.1 have molar masses larger than Xe?

3. © 2015 Pearson Education, Inc.

4. a.Yes b.No Xenon is the heaviest stable noble gas with a molar mass of 131 g/mol. Do any of the gases listed in Table 10.1 have molar masses larger than Xe?

5. © 2015 Pearson Education, Inc. a.100 kPa/100 in. 2 b.1x 105 N × 100 in. 2 c.14.7 psi × 100 in. 2 d.14.7 psi/100 in. 2 Assume the top of your head has a surface area of 25 cm × 25 cm. How many pounds of air are you carrying on your head if you are at sea level?

6. © 2015 Pearson Education, Inc. a.100 kPa/100 in. 2 b.1x 105 N × 100 in. 2 c.14.7 psi × 100 in. 2 d.14.7 psi/100 in. 2 Assume the top of your head has a surface area of 25 cm × 25 cm. How many pounds of air are you carrying on your head if you are at sea level?

7. © 2015 Pearson Education, Inc. a.Increases by doubling its original value b.Increases by tripling its original value c.Decreases to half of its original value d.Decreases to a fourth of its original value What happens to the pressure of a gas in a closed container if you double its volume while its temperature is held constant?

8. © 2015 Pearson Education, Inc. a.Increases by doubling its original value b.Increases by tripling its original value c.Decreases to half of its original value d.Decreases to a fourth of its original value What happens to the pressure of a gas in a closed container if you double its volume while its temperature is held constant?

9. © 2015 Pearson Education, Inc. a.Yes, because the temperature decreases by half. b.No, because the temperature in kelvin (K) does not decrease by half. Does the volume of a fixed quantity of gas decrease to half its original value when the temperature is lowered from 100 ° C to 50 ° C?

10. © 2015 Pearson Education, Inc. a.Yes, because the temperature decreases by half. b.No, because the temperature in kelvin (K) does not decrease by half. Does the volume of a fixed quantity of gas decrease to half its original value when the temperature is lowered from 100 ° C to 50 ° C?

11. © 2015 Pearson Education, Inc. a.(22,410) 1/3 cm b.(22.41) 1/3 cm c.(2.241) 1/3 cm d.(0.02241) 1/3 cm If 1.00 mol of an ideal gas at STP were confined to a cube, what would be the length in cm of an edge of this cube?

12. © 2015 Pearson Education, Inc. a.(22,410) 1/3 cm b.(22.41) 1/3 cm c.(2.241) 1/3 cm d.(0.02241) 1/3 cm If 1.00 mol of an ideal gas at STP were confined to a cube, what would be the length in cm of an edge of this cube?

13. © 2015 Pearson Education, Inc. a.More dense b.Less dense Is water vapor more or less dense than N 2 under the same conditions of temperature and pressure?

14. © 2015 Pearson Education, Inc. a.More dense b.Less dense Is water vapor more or less dense than N 2 under the same conditions of temperature and pressure?

15. © 2015 Pearson Education, Inc. a.The partial pressure exerted by N 2 gas does not change when O 2 is added to the container; the total pressure increases. b.The partial pressure exerted by N 2 gas changes only if an equal or greater amount of O 2 is added to the container; if that condition is met, the total pressure increases. c.The partial pressure exerted by N 2 gas decreases when O 2 is added to the container; the total pressure remains the same. d.The partial pressure exerted by N 2 gas increases when O 2 is added to the container; the total pressure remains the same. How is the partial pressure exerted by N 2 gas affected when some O 2 is introduced into a container if the temperature and volume remain constant? How is the total pressure affected?

16. © 2015 Pearson Education, Inc. a.The partial pressure exerted by N 2 gas does not change when O 2 is added to the container; the total pressure increases. b.The partial pressure exerted by N 2 gas changes only if an equal or greater amount of O 2 is added to the container; if that condition is met, the total pressure increases. c.The partial pressure exerted by N 2 gas decreases when O 2 is added to the container; the total pressure remains the same. d.The partial pressure exerted by N 2 gas increases when O 2 is added to the container; the total pressure remains the same. How is the partial pressure exerted by N 2 gas affected when some O 2 is introduced into a container if the temperature and volume remain constant? How is the total pressure affected?

17. © 2015 Pearson Education, Inc. a.Additional pressure information is needed to compare average speeds. b.HCl < O 2 < H 2 c.HCl < H 2 < O 2 d.H 2 < O 2 < HCl Consider three gases all at 298 K: HCl, H 2, and O 2. List the gases in order of increasing average speed.

18. © 2015 Pearson Education, Inc. a.Additional pressure information is needed to compare average speeds. b.HCl < O 2 < H 2 c.HCl < H 2 < O 2 d.H 2 < O 2 < HCl Consider three gases all at 298 K: HCl, H 2, and O 2. List the gases in order of increasing average speed.

19. © 2015 Pearson Education, Inc. a.Sqrt(2/3) b.1 c.Sqrt(3/2) d.Sqrt(2) What is the ratio of u rms to u mp for a sample of O 2 (g) at 300 K?

20. © 2015 Pearson Education, Inc. a.Sqrt(2/3) b.1 c.Sqrt(3/2) d.Sqrt(2) What is the ratio of u rms to u mp for a sample of O 2 (g) at 300 K?

21. © 2015 Pearson Education, Inc. a.Changes with temperature; changes depending on gas identity b.Changes with temperature; does not change depending on gas identity c.Does not change with temperature; changes depending on gas identity d.Does not change with temperature; does not change depending on gas identity Will this ratio change as the temperature changes? Will it be different for a different gas?

22. © 2015 Pearson Education, Inc. a.Changes with temperature; changes depending on gas identity b.Changes with temperature; does not change depending on gas identity c.Does not change with temperature; changes depending on gas identity d.Does not change with temperature; does not change depending on gas identity Will this ratio change as the temperature changes? Will it be different for a different gas?

23. © 2015 Pearson Education, Inc. Increasing PIncreasing T a.IncreaseIncrease b.DecreaseNo change c.IncreaseDecrease d.No changeDecrease Will these changes increase, decrease, or have no effect on the mean free path of the molecules in a gas sample? (a) increasing pressure. (b) increasing temperature.

24. © 2015 Pearson Education, Inc. Increasing PIncreasing T a.IncreaseIncrease b.DecreaseNo change c.IncreaseDecrease d.No changeDecrease Will these changes increase, decrease, or have no effect on the mean free path of the molecules in a gas sample? (a) increasing pressure. (b) increasing temperature.

25. © 2015 Pearson Education, Inc. a.100 K and 1 atm b.100 K and 5 atm c.300 K and 2 atm Under which conditions do you expect helium gas to deviate most from ideal behavior?

26. © 2015 Pearson Education, Inc. a.100 K and 1 atm b.100 K and 5 atm c.300 K and 2 atm Under which conditions do you expect helium gas to deviate most from ideal behavior?

27. © 2015 Pearson Education, Inc. a.Attractive intermolecular forces b.Repulsive intermolecular forces Explain the negative deviation from ideal gas behavior of N 2 below 300 atm in Figure 10.20.

28. © 2015 Pearson Education, Inc. a.Attractive intermolecular forces b.Repulsive intermolecular forces Explain the negative deviation from ideal gas behavior of N 2 below 300 atm in Figure 10.20.