2. 100 Gas Laws 100 200 300 400 500 P.E. Diagrams Rate of Reactions Heat Calculations Equilibrium 600

3. When does a real gas behave the most like an ideal gas? High temperature and low pressure

4. What values are STP? 1 atm and 273K

5. A sample of Nitrogen gas is at 1 atm of pressure and a volume of 4 liters. What volume of Helium will have the same number of molecules if pressure and temperature are kept constant? 4 liters

6. What happens to pressure when volume increases and temperature stays the same? Pressure decreases

7. What happens to volume when temperature is increased and pressure stays constant? Volume increases

8. Consider the following reaction: Zn(s) + HCl(aq)  ZnCl(s) + H 2 (g) Will 5 grams of powdered zinc or a 5 gram cube of zinc react faster? Powdered zinc

9. A sample of gas has a volume of 20L and is at STP. If temperature is raised to 300K and pressure is increased to 2 atm, what will the new volume be? 11 Liters

10. Which value is labeled A? P.E. of Reactants

11. What value is the Activation Energy? B

12. What value is the heat of reaction? C

13. How does adding a catalyst effect the P.E. of a chemical reaction? Activation energy is lowered

14. What type of reaction is this? Endothermic

15. What type of reaction is shown here? Exothermic

16. Define equilibrium When the rate of the forward Reaction equals the rate of the Reverse reaction

17. During equilibrium what is true about the concentration of the reactants and products? The concentrations stay constant

18. What will cause a shift to the right? 8C + 9H 2  C 8 H 18 Increasing C, H2, decreasing C8H18

19. What happens to the following reaction when the concentration of C is decreased? C + 2Cl 2  CCl 4 Shifts to the left

20. What will increasing pressure do to the following reaction? N 2(g) + 3H 2(g)  2NH 3(g) + energy Shift right

21. What will cause a shift to the right? H 2 O(s) + heat  H 2 O(l) Increasing ice, increasing temp, decreasing water

22. What is the specific heat of water? 4.18 J/g x C

23. How much heat energy is required to melt a 10 gram piece of ice? 3340 J

24. 2508 Joules How much heat energy is required to Raise the temperature of 20 grams of Water from 20 to 50 degrees Celsius?

25. Define specific heat The amount of energy required to raise the temperature of one gram of a substance by 1 degree Celsius

26. How much energy is required to condense 15 grams of water vapor to 15 grams of liquid water? 33900 Joules

27. How is temperature different than heat? Temp is Average Kinetic Energy, Heat is a transfer of thermal energy

28. What does a catalyst do? Increases the rate of a reaction By lowering activation energy

29. List 3 factors that can increase the rate of a reaction Increasing temp, pressure, surface area, adding a catalyst, nature of reactants

30. Why do ionic compounds react at a faster rate than covalent compounds? In ionic bonds, electrons are transferred, not shared, therefore the ions can separate faster and require less energy to break the bonds

31. Why does increasing pressure increase the rate of a reaction Increasing pressure pushes molecules closer together, causing them to move faster and collide more frequently

32. Explain why increasing temperature causes a reaction to increase Molecules move faster, increasing collisions

33. Final Jeopardy Category: Vapor Pressure

34. Explain why people living at high altitudes need to boil food for longer times ? Lower atmospheric pressure causes Water to boil at a lower temperature