1. Unit 9 Review Gases and States of Matter

2. 1. What is a key difference between a liquid and a gas? A. Particles are moving faster in a liquid B. Particles are moving faster in a gas C. The particles have higher KE in a liquid D. The particles are held in place in a gas

3. 2. Which of the following is NOT one of the three points of the kinetic theory for gases? A.Particle movement is constant and random. B.Forces of attraction can generally be ignored. C.They move independently until they collide. D.Gas atoms move in circular motion.

4. 3. Which of the following statements are true? I. In solids particles vibrate in fixed locations. II. Forces of attractions in liquids are stronger than those in solids. a.I. only b.II. only c.Both I and II d.Neither I nor II.

5. 4. What causes gas pressure in a container, such as a helium balloon? A.The particles bouncing off the walls of the balloon B. The particles vibrating at their location C. The particles evaporating D. All of the above

6. 5. The average kinetic energy of water molecules is greatest in which of the following? A. Steam at 110 o C B. Liquid water at 353 K C. Solid substance at -15 o C D. All are the same

7. 6. What happens to the average kinetic energy of the particles in a sample of matter as the temperature of the sample is increased? A. It increases B. It decreases C.No change

8. 7. Consider an iron cube and an aluminum cube. If the two cubes were at the same temperature, how would the average kinetic energy of the Fe particles compare with Al? A. They would be the same B. Fe’s KE would be higher C. Al’s KE would be higher D. Can not be determined

9. 8. What is the standard temperature and pressure? A. 273 atm and 1 K B. 101.3 atm and 273 K C. 1 atm and 0 K D. 1 atm and 273 K

10. 9. Why does the pressure inside a container of gas increase if more gas is added to the container? A.There is a decrease in the volume of the gas. B.There is an increase in the number of collisions between the particles and the walls of the container. C.There is an increase in the temperature of the gas. D.There is an decrease in the force of each collisions between the particles and the walls of the container.

11. 10. As the temperature of the gas in a balloon decreases, which of the following occurs? A.The volume of the balloon increases. B.The average kinetic energy of the gas decreases. C.The gas pressure inside the balloon increases. D.All of the above.

12. 11. Which of these changes would NOT cause an increase in the pressure of a contained gas? A.The temperature is increased. B.More of the gas is added to the container. C.The volume of the container is increased. D.The average kinetic energy of the gas is increased.

13. 12. When the Kelvin temperature of an enclosed gas doubles, the particles of the gas A.Move faster B.Strike the walls of the container with less force C.Decrease in average kinetic energy D.Decrease in volume

14. 13. When the pressure and number of particles in a gas are constant, which of the following is also constant? A.The sum of the volume and temperature in Kelvin. B.The difference of the volume and temperature in Kelvin. C.The product of the volume and temperature in Kelvin. D.The ratio of the volume and the temperature in Kelvin.

15. 14. Under what conditions of temperature and pressure is the behavior of a real gas most like that of an ideal gas? A.Low temperature and low pressure B.Low temperature and high pressure C.High temperature and low pressure D.High temperature and high pressure

16. 15. Which gas law can be used to calculate the number of moles of a contained gas? A. Boyle’s B. Charles C. Combined D. Ideal

17. 16. If a heated sealed syringe is plunged into cold water, in which direction will the syringe piston slide? A. In B. Out C. No change D. Not enough information

18. 17. Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time? A. Nitrogen B. Hydrogen C. Argon D. Helium

19. 18. A balloon expanding when going from a cold room to a hot room is an example of A. Boyle’s law B. Charles’s Law C. Gay-Lussac’s Law D. Dalton’s Law

20. 19. What instrument measures pressure? A. Thermometer B. Calorimeter C. Manometer D. Vacuum pump

21. 20. The pressure of a gas is 550 mm Hg. What is this pressure in kPa? A.550 kPa B.73.3 kPa C.0.723 kPa D.101.3 kPa

22. 21. You have 1 mol of H 2 gas and 1 mol of N 2 gas at STP. What are their volumes? A.H 2 : 2 L; N 2 : 28 L B.H 2 : 1 L; N 2 : 14 L C.H 2 : 22.4 L; N 2 : 22.4 L D.H 2 : 44.8 L; N 2 : 627 L

23. 22. A sample of Ne gas has a pressure of 2.2 atm. What is its pressure in mm Hg? A.1672 mm Hg B.223 mm Hg C.0.029 mm Hg D.16.5 mm Hg

24. 23. Which law states the relationship between temperature and volume at constant pressure? a.Boyle’s law b.Charles’ law c.Gay-Lussac’s law d.Dalton’s law

25. 24. A mixture of He, Ar, and Ne has a total pressure of 1.67 atm. Given that p(Ne) = 0.39 atm and p(Ar) = 1.03 atm, what is the partial pressure of He? a.1.42 atm b.0.64 atm c.3.09 atm d.0.25 atm

26. Answers 1. B9. B17. C 2. D10. B18. B 3. A11. C19. C 4. A12. A20. B 5.A13. D21. C 6. A14. C22. A 7. A15. D23. B 8. D16. A24. D