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Kinetics Quiz #1

8 Questions
Kinetics Quiz #1

Quick quiz on reaction rates and enthalpys.

Questions and Answers
  • 1. 
    The difference between the potential energy of the products and the potential energy of the reactants is the
    • A. 

      Heat of fusion

    • B. 

      Heat of reaction

    • C. 

      Free energy

    • D. 

      Activation energy

    • E. 

      Positive energy

  • 2. 
    When NH4NO3 is dissolved in water, the temperature of the water decreases.  When NaOH is dissolved in a separate water sample, the temperature of the water increases.  Based on these observations, it can be concluded that the dissolving of
    • A. 

      Both salts are endothermic.

    • B. 

      Both salts are exothermic.

    • C. 

      NH4NO3 is exothermic and the dissolving of NaOH is endothermic.

    • D. 

      NH4NO3 is endothermic and the dissolving of NaOH is exothermic.

  • 3. 
    What is the heat of formation of 1 mole of H2O(g)?
    • A. 

      -241.8 kj/mol

    • B. 

      -483.6 kj/mol

    • C. 

      -285.5 kj/mol

    • D. 

      -571.6 kj/mol

  • 4. 
    Activation energy is required to initiate
    • A. 

      Endothermic reactions only.

    • B. 

      Neither exothermic or endothermic reactions.

    • C. 

      Both exothermic and endothermic reactions.

    • D. 

      Exothermic reactions only.

  • 5. 
    In the reversible reaction, the difference between the activation energy of the forward reaction and the activation energy of the reverse reaction is equal to the 
    • A. 

      Activated complex.

    • B. 

      Potential energy of the products.

    • C. 

      Potential energy of the reactants.

    • D. 

      Heat of reaction.

  • 6. 
    Which condition will increase the rate of a chemical reaction?
    • A. 

      Increased temperature and decreased concentration of reactants

    • B. 

      Increased temperature and increased concentration of reactants

    • C. 

      Decreased temperature and decreased concentration of reactants

    • D. 

      Decreased temperature and increased concentration of reactants.

  • 7. 
    At room temperature which reaction would be expected to have the fastest reaction rate?
    • A. 

      2KClO3(s)--> 2KCl(s) + 3O2(g)

    • B. 

      Pb+2(aq) + S-2(aq) --> PbS(s)

    • C. 

      2H2(g) + O2(g) --> 2H2O(l)

    • D. 

      N2(g) + 2O2(g) --> 2NO2(g)

  • 8. 
    Given the reaction:     2 SO2(g) + O2(g) --> 2 SO3(g)  The rate of the forward reaction increases by adding more SO2 because the
    • A. 

      Number of molecular collisions will increase

    • B. 

      Temperature will increase

    • C. 

      Forward reaction is endothermic

    • D. 

      Reaction will shift to the left