1. $$$ Quiz $$$ Gases

2. The tendency of molecules to move toward areas of lower concentration? (Chapter 14.4) diffusion

3. What does KMT stand for? Kinetic molecular theory

4. What is the ideal gas law? PV=nRT

5. What do each of the variables in the ideal gas law stand for? pressure, volume, temperature, moles, gas constant

6. Can you list/name the 5 assumptions made for KMT? 1)Particles are in constant motion. They possess kinetic energy. 2)The actual volume of gas particles is negligible. Particles are far apart. 3)Gas particles do not attract or repel. 4) The average kinetic energy of a gas is directly proportional to the Kelvin temperature of the gas. 5) All collisions are elastic.

7. The theoretical temperature at which molecules stop moving. Absolute zero, 0 o K

8. What is an elastic collision? A collision between gas molecules where there is no loss of kinetic energy (KE)

9. What happens to the pressure of a gas inside a container if the temperature of the gas increases? The pressure increases

10. What are STP conditions? 0 o C or 273 K 760 mm Hg or 1.0 atm

11. What is the formula for Gay- Lussac’s Law?

12. What is the formula for Charles’ Law?

13. What is the formula for Boyle’s Law?

14. What is the formula for the combined gas law?

15. As the temperature of a fixed volume of gas increases, the pressure will increase. Which gas law is being described? Gay-Lussac’s Law

16. As the volume of gas increases, the pressure decreases in a sample of gas at fixed temperature. Which gas law is being described? Boyle’s Law

17. As the temperature of a fixed pressure of gas decreases, the volume will increase. Which gas law is being described? None, it would be Charles’ Law if the volume decreased

18. True or False. The value for R of 0.0821 L. atm/mol. K is the same anywhere in the galaxy or for that matter in the universe. True

19. You have one mole of gas at 273 K and 1 atm in a balloon. How big must the balloon be? 22.4 L

20. How many different units of pressure can you name? (1 CD for each one you name up to 6 CD’s) mm Hg (or inches) pascals (Pa) or kilopascals (kPa) atmospheres (atm) pounds per square inch (psi) torr bars

21. Which temperature scale is the best to use when working with the gas laws? Kelvin

22. You have a temperature of a sample of gas at 205 K. What temperature in o C is this? -68 o C

23. You have 28 grams of nitrogen gas at 0 o C and a pressure of 760 mm of Hg. What is its volume? 22.4 L

24. You have 14 grams of nitrogen gas at 0 o C and a pressure of 760 mm of Hg. What is its volume? 11.2 L

25. You have 28 grams of nitrogen gas at 273 K and a pressure of 0.5 atm. What is its volume? 44.8 L

26. You have 14 grams of nitrogen gas at 0 o C and a pressure of 380 mm of Hg. What is its volume? 22.4 L

27. True or False. Air pressure increases as you go higher in altitude (up to the top of a mountain). False

28. Chemical equations must be balanced to satisfy _____ the law of conservation of mass

29. What is Avogadro’s number? 6.02 x 10 23 particles per mole

30. The pressure in a gas container is 237 mm Hg. How many atmospheres (atm) is this? 0.31 atm

31. If you have 1 mole of a gas at 1.0 atm, what does the ideal gas law simplify down to. V = RT

32. The volume of gas is doubled while the temperature is held constant. How does the gas pressure change? Reduced by one half

33. What is a precipitate? A solid that forms during a chemical reaction