1. Unit 11 Kinetics / Equilibrium

2. 1. Which of the following is false about catalysts? A.it speeds up the reaction rate B.it lowers the activation energy C.it lowers the energy of the reactants and products D.it is present in the beginning of the reaction and at the end of the reaction

3. 2. What happens to the compounds in the following reaction as time progresses? NaCl + AgNO 3  AgCl + NaNO 3 A.The amounts of NaCl and AgNO3 decrease; AgCl and NaNO3 increase B.The amounts of NaCl and AgNO3 increase; AgCl and NaNO3 decrease C.The amounts of NaCl and NaNO3 decrease; AgCl and AgNO3 increase D.The amounts of NaCl and NaNO3 increase; AgCl and AgNO3 decrease

4. 3. Which of the following will NOT speed up the reaction rate of most reactions? A.increasing the temperature B.increasing the agitation C.increasing the surface area D.they will all speed up the reaction rate

5. 4. What are two requirements for an effective collision? A.proper orientation and collision frequency B.collision frequency and sufficient activation energy C.proper orientation and sufficient activation energy D.random collisions and proper orientation

6. 5. What is activation energy? A.The initial energy of the reaction B.The difference in energy between the reactants and products C.The energy that must be overcome to convert the reactants completely into products D.The final energy of the reaction

7. 6. Explain WHY each of the factors increase the reaction rate in terms of collision theory AConcentration High Low BSurface Area High Low CTemperature High Low DCatalyst--- Increase decrease Increase decrease

8. 7. Energy Diagram Exothermic ReactionEndothermic Reaction

9. 8. Energy Diagram w/catalyst Exothermic ReactionEndothermic Reaction

10. 9. Draw the graph of concentration vs. time for HC 2 H 3 O 2  H + + C 2 H 3 O 2 - Label the axes and reactants and products. Label which time equilibrium is reached.

11. 10. According to your graph of [ ] vs. time, when is the reaction rate the fastest? When is it the slowest? In the beginning Over time, at the end or in equilibrium

12. 11. Write the equilibrium expression for the reaction: 2H 2 O (g)  2H 2 (g) + O 2 (g)

13. 12. Which of the following equilibrium expression for the reaction is correct? 3LiOH (aq) + H 3 PO 4 (aq)  3H 2 O (l) + Li 3 PO 4 (aq) A. B. C.

14. 13. Write the equilibrium expression for the reaction: 2AgNO 3 (aq) + CaSO 4 (aq)  Ag 2 SO 4 (s) + Ca(NO 3 ) 2 (aq) [Ca(NO 3 ) 2 ] [AgNO 3 ] 2 [CaSO 4 ]

15. 14. Consider the reaction: 2A (g) + B (g)  4C(g) + heat. What will happen if the volume decreases? A.Heat will be produced B.B decreases C.The formation of reactants will be favored D.The formation of products will be favored

16. 15. If the following processes take place at equal rates, which of the following does not represent a state of equilibrium? A.Freezing  Melting B.Sublimation  Deposition C.Evaporation  Condensation D.Sublimation  Melting

17. 16. Consider the reaction: CO 2 (g) + H 2 O(l)  H 2 CO 3 (aq)? What is the effect of adding more CO 2 ? A.H 2 CO 3 is produced B.H 2 O is produced C.The formation of reactants will be favored D.The reaction does not shift

18. 17. Consider the reaction: H 2 (g) + Cl 2 (g)  2HCl (g). What happens when the pressure decreases? A.H2 increases B.Cl2 decreases C.HCl increases D.The reaction does not shift

19. 18. Consider the reaction: Na 3 PO 4 (s)  3Na + (aq) + PO 4 3- (aq). What happens when Na 3 PO 4 is added? A. Na + increases B.PO 4 3- decreases C.Na + decreases D.The reaction does not shift