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Unit 13 Review

Unit 13 Review. Kinetics & Equilibrium. 1 . Energy that is available to do work is called ____. A . Exothermic energy B . Endothermic energy C . Gibbs’ Free Energy D . Heat.

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Unit 13 Review

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  1. Unit 13 Review Kinetics & Equilibrium

  2. 1. Energy that is available to do work is called ____. A. Exothermic energy B. Endothermic energy C. Gibbs’ Free Energy D. Heat

  3. 2. ____ is defined as the number of atoms, ions, or molecules that react in a given time to form products. A. Reaction Rate B. Concentration C. Time D. Spontaneous Reaction

  4. 3. What is the name of the minimum energy that colliding particles must have in order to react? A. Activated complex B. Activation energy C. Progress of reaction D. Gibb’s Free Energy

  5. 4. What is the arrangement of atoms at the peak of an energy barrier? A. Activated complex B. Activation energy C. Reactant D. Product

  6. 5. At equilibrium, what is the rate of production of reactants compared with the rate of production of products? A. Higher B. Lower C. The same D. Not enough information

  7. 6. The rate of a chemical reaction normally ____ as reactant concentration increases. A. Increases B. Decreases C. Stays the same D. Not enough information

  8. 7. The amount of disorder in a system is measured by its ____. A. Enthalpy B. Entropy C. Heat change D. Gibbs’ Free Energy

  9. 8. If a reaction has an equilibrium constant (Keq) just greater than 1, how do we interpret that information? A. Reactants are favored B. Products are favored C. Both reactant and product are favored D. Neither reactant or product are favored

  10. 9. Which variable is NOT required to calculate the Gibbs free-energy change for a chemical reaction? A. Change in enthalpy B. Change in entropy C. Temperature in oC D. Temperature in K

  11. 10. What is the effect of adding more water to the following equilibrium reaction: CO2 + H2O ↔ H2CO3 A. Concentration of H2CO3 decreases B. Concentration of H2CO3 increases C. Concentration of CO2 increases D. Concentration of H2O decreases

  12. 11. In an endothermic reaction at equilibrium, what is the effect of raising the temperature? A. Shift to the reactants B. Shift to the products C. No effect D. Not enough information

  13. 12. What is the numerical value (+ or -) of Gibbs free-energy change for a spontaneous reaction? A. ∆G is positive B. ∆G is negative

  14. 13. At what stage of a reaction do atoms have the highest energy? A. As reactants B. As products C. At the transition stage (activated complex) D. They don’t have energy

  15. 14. Which of the following systems has the highest entropy: A. 10 mL of HClat 50 oC B. 10 mL of HClat 100 oC C. 10 mL of HClat 75 oC D. 10 mL of HClat 10 oC

  16. 15. An elementary reaction converts reactants to products in ____. A. A single step B. In multiple steps

  17. 16. Consider the reaction: N2(g) + 3H2(g)↔ 2NH3(g)What is the effect of decreasing the volume on the contained gases? A. Concentration of NH3 increases B. Concentration of N2 increases • Concentration of H2 decreases D. Both A and C

  18. 17. Spontaneous reactions always ____ free energy. A. Release B. Absorb C. Contain D. All of the above

  19. 18. What physical state of nitrogen has the highest entropy? A. Solid B. Liquid C. Gas D. All the same

  20. 19. What is another name for the catalysts in your body? A. Inhibitor B. DNA C. Enzyme D. RNA

  21. 20. In an equilibrium reaction with a Keq of 1 x 108, the ____ are favored. A. Reactants B. Products C. Both reactants and products D. Neither reactants or products

  22. 21. In which of these systems is the entropy decreasing: A. Salt dissolving in water B. Aliquid cooling C. Heating a liquid D. Breaking apart a sugar cube

  23. 22. In a two-step reaction mechanism, how many elementary reactions occur? A. 0 B. 1 C. 2 D. 3

  24. 23. The Keq of a reaction is 4 x 10-7. At equilibrium, the ____ are favored. A. reactants B. products C. Both reactants and products D. Neither reactants or products

  25. 24. Another name for the activated complex is ____. A. Activation energy B. reactant C. product D. Transition state

  26. 25. A catalyst works by ____. A. Increasing the amount of energy you need. B. Decreasing the activation energy. C. Acting as an inhibitor. D. None of the above.

  27. Answers 1. C 9. C 17. A 2. A 10. B 18. C 3. B 11. B19. C 4. A 12. B 20. B 5. C 13. C 21. B 6. A 14. B 22. C 7. B 15. A23. A 8. B 16. D 24. D 25. B

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