Chemistry Ch18&19 Exam

79 Questions | Total Attempts: 261

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Chemistry Ch18&19 Exam

Questions and Answers
  • 1. 
    The law of chemical equilibrium states that at a given pressure, a chemical system may reach a state in which a particular ratio of reactant to product concentrations has a constant value. 
    • A. 

      True

    • B. 

      False

  • 2. 
    • A. 

      True

    • B. 

      False

  • 3. 
    If an equilibrium constant has a value less than one, the reactants are favored at equilibrium. 
    • A. 

      True

    • B. 

      False

  • 4. 
    The value for Keq is constant only at a specific volume. 
    • A. 

      True

    • B. 

      False

  • 5. 
    In an exothermic reaction, an increase in temperature favors the formation of products
    • A. 

      True

    • B. 

      False

  • 6. 
    • A. 

      True

    • B. 

      False

  • 7. 
    • A. 

      True

    • B. 

      False

  • 8. 
    A heterogeneous equilibrium means that reactants and products are present in more than one state. 
    • A. 

      True

    • B. 

      False

  • 9. 
    If the equilibrium constant for a reaction at 300 K is 49.7, the concentration of the reactants will be greater than the concentration of the products. 
    • A. 

      True

    • B. 

      False

  • 10. 
    • A. 

      0.16 mol/L

    • B. 

      0.0014 mol/L

    • C. 

      0.075 mol/L

    • D. 

      0.75 mol/L

  • 11. 
    • A. 

      8.9 x 10-3 mol/L

    • B. 

      2.0 x 10-2 mol/L

    • C. 

      2.0 x 10-3 mol/L

    • D. 

      7.4 x 10-3 mol/L

  • 12. 
    The solubility product expression describes the equilibrium between a sparingly soluble ionic compound 
    • A. 

      The amount of substance added to solution.

    • B. 

      The number of moles in the reaction.

    • C. 

      Its ions in solution.

    • D. 

      The equilibrium constant.

  • 13. 
    • A. 

      The equilibrium shifts to the left.

    • B. 

      The equilibrium shifts to the right.

    • C. 

      The equilibrium does not change.

    • D. 

      The equilibrium constant changes.

  • 14. 
    • A. 

      Le Châtelier’s principle

    • B. 

      Common ion effect

    • C. 

      Solubility product constant

    • D. 

      Law of chemical equilibrium

  • 15. 
    What is indicated by a large value for Keq?
    • A. 

      A solution is saturated.

    • B. 

      Products are favored in the reaction.

    • C. 

      Reactants are favored in the reaction.

    • D. 

      The reaction is endothermic.

  • 16. 
    The value of any equilibrium constant is correct only at
    • A. 

      A specific volume.

    • B. 

      A specific pressure.

    • C. 

      A specific concentration.

    • D. 

      A specific temperature.

  • 17. 
    • A. 
    • B. 
    • C. 
    • D. 
  • 18. 
    • A. 

      The temperature of the system increases.

    • B. 

      The temperature of the system decreases.

    • C. 

      More chlorine is produced.

    • D. 

      The temperature remains unaffected.

  • 19. 
    According to Le Chatelier’s principle, when the volume is increased, the equilibrium shifts to the right. For which of the following reversible reactions is this true?
    • A. 
    • B. 
    • C. 
    • D. 
  • 20. 
    • A. 

      Decrease in the volume of N2.

    • B. 

      Increase in the amount of catalyst.

    • C. 

      Decrease in pressure.

    • D. 

      Decrease in temperature.

  • 21. 
    What might cause the solubility of a substance to decrease?
    • A. 

      A decrease in temperature

    • B. 

      A decrease in pressure

    • C. 

      The presence of a common ion

    • D. 

      All of the choices

  • 22. 
    What can be determined if the ion product is compared to the solubility product constant?
    • A. 

      Equilibrium

    • B. 

      whether a substance will precipitate

    • C. 

      The law of mass action

    • D. 

      The volume of the solution

  • 23. 
    When a reaction results in almost complete conversion of reactants to products, chemists say the reaction goes to ____________________.
    • A. 

      Completion

    • B. 

      Reversible reaction

    • C. 

      Chemical equilibrium

    • D. 

      Constant, equal

    • E. 
  • 24. 
    The solubility product of aluminum sulfate Al2(SO4)3 is given by the expression ____________________.
    • A. 

      Completion

    • B. 

      Reversible reaction

    • C. 

      Chemical equilibrium

    • D. 

      Constant, equal

    • E. 
  • 25. 
    At equilibrium, the concentrations of reactants and products are ____________________, but that does not mean that the amounts or concentrations are ____________________. 
    • A. 

      Completion

    • B. 

      Reversible reaction

    • C. 

      Chemical equilibrium

    • D. 

      Constant, equal

    • E. 
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