CHM 115 CHM115 Practice Quiz Chapter 17 and 18 Answers (Grand Canyon University)

CHM 115 CHM115 Practice Quiz Chapter 17 and 18 Answers (Grand Canyon University)


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CHM115 Practice Quiz Chapter 17&18 Answers (Grand Canyon University)

  1. If S° for the following reaction is -149 J/mol.  Calculate S° for Cl2 (g).
  2. What is the highest temperature at which the following reaction becomes spontaneous?

  3. What is the value of ΔG° (in kJ/mol) for this reaction at 25°C?

  4. Which of the following reactions have a decrease in entropy?

  5. Calculate the entropy change (J/mole.K) of the reaction. The entropies [S in J/mol K] are given in brackets after each substance.

  6. Which statement is true if the following reaction is done at 25 oC?

  7. Which of the following reactions would have a positive value for ΔS°?

  8. Calculate ΔG0 (kJ/mol) for the reaction using the listed [ΔG0f values]:

  9. Liquid water freezes spontaneously at -5oC and 1 atm. Which of the following statements is most likely TRUE?

  10. Hydrogen peroxide decomposes according to the following reaction:

  11. Which one of the following cannot be determined using thermodynamics?

  12. A reaction that is spontaneous as written __________.

  13. Which of the following reactions would have a negative value for ΔS°?

  14. The reaction rates for many spontaneous reactions are actually very slow. Which of the following is the best explanation for this observation?

  15. The following reaction has a Δvalue of 32.64 kJ/mol at 25°C.

  16. For which process is S negative?

  17. For a particular chemical reaction H = 6.8 kJ and S = –29 J/K. Under what temperature condition is the reaction spontaneous?

  18. For the reaction A + B C + D, H° = +40 kJ and S° = +50 J/K. Therefore, the reaction under standard conditions is

  19. Consider the following hypothetical reaction at 310 K. Standard free energies of formation are given in parentheses.

  20. Water gas, a commercial fuel, is made by the reaction of hot coke carbon with steam.

    C(s) + H2O(g)   CO(g) + H2(g)

  21. What is the oxidation state of Hg in Hg2Cl2?

  22. Which of the following is true for the cell shown here?

  23. What is the balanced chemical equation corresponding to the following cell diagram?

  24. What is ℰ°cell for the following electrochemical equation?

  25. .....



Solutions of Ag+, Cu2+, Fe3+ and Ti4+ are electrolyzed with a constant current until 0.10 mol of metal is deposited. Which will require the greatest length of time?

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