Quiz 13.1 - Heat Changes In Reactions

10 Questions | Total Attempts: 121

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Quiz 13.1 - Heat Changes In Reactions

A quiz over heat changes in reactions and the factors affecting reaction rate.


Questions and Answers
  • 1. 
    In this energy profile for a reaction, what is represented by the arrow labeled W?
    • A. 

      Activation energy

    • B. 

      Energy of products

    • C. 

      Energy of activated complex

    • D. 

      Change in enthalpy

  • 2. 
    In this energy profile for a reaction, what is represented by the arrow labeled Z?
    • A. 

      Activation energy

    • B. 

      Energy of products

    • C. 

      Energy of activated complex

    • D. 

      Change in enthalpy

  • 3. 
    In this energy profile for a reaction, what is represented by the arrow labeled R?
    • A. 

      Energy of reactants

    • B. 

      Energy of products

    • C. 

      Energy of activated complex

    • D. 

      Change in enthalpy

  • 4. 
    In this energy profile for a reaction, what is being plotted on the y-axis?
    • A. 

      Progress of the reaction

    • B. 

      Time

    • C. 

      Potential energy

    • D. 

      Mass of the reactants

  • 5. 
    This reaction is best described as
    • A. 

      Endothermic

    • B. 

      Exothermic

    • C. 

      Catalyzed

    • D. 

      A multi-step reaction mechanism

  • 6. 
    A catalyst is best described as
    • A. 

      A substance which speeds up a reaction without being consumed.

    • B. 

      A substance which adds sufficient heat to a chemical reaction to allow it to react.

    • C. 

      A substance which grinds the reactants into smaller pieces so they can react faster.

    • D. 

      A substance which prevents a reaction from happening at all.

  • 7. 
    In the equation Q=MCDT, the variable Q stands for
    • A. 

      Question (in grams).

    • B. 

      Heat (in joules).

    • C. 

      Specific heat capacity (in Joules/gram-degrees Celsius).

    • D. 

      Change in temperature (in degrees Celsius).

  • 8. 
    A good way to speed up a chemical reaction would be to
    • A. 

      Lower the temperature of the reaction vessel.

    • B. 

      Use larger chunks of reactants.

    • C. 

      Increase the concentration of the reactants.

    • D. 

      Use a larger beaker for the reaction, instead of a smaller one.

  • 9. 
    Generally, an easy way to double the rate of a chemical reaction would be to
    • A. 

      Use larger chunks of material in the reactions.

    • B. 

      Lower the temperature by 15 degrees Celsius.

    • C. 

      Stir the reaction beaker vigorously.

    • D. 

      Raise the temperature by 10 degrees Celsius.

  • 10. 
    A high-energy, unstable compound that is formed after the reactant phase but before the product phase is called a(n) ___.
    • A. 

      Catalyst.

    • B. 

      Substrate.

    • C. 

      Joule.

    • D. 

      Activated complex.

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