Review!!

1. Review!! • Each of these flasks is the same size and at the same temperature. Which one contains the fewest molecules? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

2. Four different flasks contain gas samples at 298 K. In which of the following samples will the gas molecules be moving the slowest? • a. H2 • b. O2 • c. CO2 • d. N2 The largest molecules are the slowest!

3. Each of these flasks contains the same number of gas molecules. In which would the pressure be lowest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

4. If all of the following flasks are the same size, at the same temperature, and contain the same number of molecules, in which flask will the molecules be moving slowest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

5. Each of these flasks is the same size and at the same temperature. In which flask will diffusion occur most slowly? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4 Lower pressure = slower molecules

6. Which of the following gases would have the fastest rate of diffusion, assuming all of the gases are at the same temperature? • a. Ne • b. Ar • c. Kr • d. He Smaller molecules mover faster than larger ones so they will diffuse faster!

7. Which of the following changes to a system WILL NOT result in an increase in pressure? • a. increasing the vol of the container • b. adding more gas molecules • c. raising the temp • d. decreasing the vol of the container

8. Four different flasks contain gas samples at 298 K. In which of the following samples will the gas molecules be moving the fastest? • a. CO2 • b. N2 • c. H2 • d. O2 Smaller molecules move faster!

9. Which of the following gases would have the slowest rate of diffusion, assuming all of the gases are at the same temperature? • a. Ne • b. He • c. Ar • d. Kr Larger molecules move slower than smaller ones & thus will diffuse slower rate!

10. If all of the following flasks are the same size, at the same temperature, and contain the same number of molecules, in which flask will the molecules be moving fastest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

11. Each of these flasks is the same size and at the same temperature. Which one contains the most molecules? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4 Cramming more molecules in to a volume increases the pressure!

12. Each of these flasks contains the same number of molecules. In which container is the pressure highest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

13. Each of these flasks contains the same number of molecules. In which container is the pressure lowest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4

14. Gas pressure is caused by: • a. gas molecules condensing to a liquid • b. gas molecules hitting each other • c. gas molecules colliding with surfaces • d. barometers

15. If all of the following flasks are the same size, at the same temperature, and contain the same number of molecules, in which flask will the pressure be highest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4 • e. all have the same pressure Pressure doesn’t depend on the ID of the gas!

16. Each of these flasks contains the same number of gas molecules. In which would the pressure be highest? • a. flask 1 • b. flask 2 • c. flask 3 • d. flask 4 • e. same pressure