Thermochemistry Review

15 Questions | Total Attempts: 1484

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Thermochemistry Quizzes & Trivia

Questions and Answers
  • 1. 
    What do we call the heat content of a system
    • A. 

      Entropy

    • B. 

      Heat

    • C. 

      Enthalpy

    • D. 

      Temeprature

  • 2. 
    The SI unit of energy is
    • A. 

      Heat capacity.

    • B. 

      Calorie.

    • C. 

      Joule.

    • D. 

      Enthalpy.

  • 3. 
    How many calories are required to raise the temperature of 75.0 g of water from 20C to 50C?
    • A. 

      2250 cal

    • B. 

      3750 cal

    • C. 

      75.0 cal

  • 4. 
    When your body is warmed by an electric blanket during the winter, this process is said to be
    • A. 

      Endothermic.

    • B. 

      Exothermic.

    • C. 

      Isothermic.

  • 5. 
    A student mixes two water solutions with an initial temperature of 25.0C to form a final solution with a mass of 65.0 g at 30.0C. What is the heat change, in kJ, for this reaction?
    • A. 

      325 kJ

    • B. 

      272 kJ

    • C. 

      1.36 kJ

  • 6. 
    Given the equation Si(s) + 2Cl2(g) ------>SiCl2(g) ------>SiCl2(l) + 687 kJ, how much heat is produced when 106 g of Cl2 react?
    • A. 

      513 kJ

    • B. 

      360 kJ

    • C. 

      180 kJ

  • 7. 
    A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?
    • A. 

      80 kJ

    • B. 

      35.96 kJ

    • C. 

      179800 kJ

    • D. 

      143.84 J

    • E. 

      143.84 kJ

  • 8. 
    Which of the following is NOT a unit for heat?
    • A. 

      Celsius

    • B. 

      Calories

    • C. 

      Joules

    • D. 

      Kilocalories

  • 9. 
    A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?
    • A. 

      80 kJ

    • B. 

      35.96 kJ

    • C. 

      179800 kJ

    • D. 

      143.84 J

    • E. 

      143.84 kJ

  • 10. 
    Which of the following is NOT a unit for heat?
    • A. 

      Celsius

    • B. 

      Calories

    • C. 

      Joules

    • D. 

      Kilocalories

  • 11. 
    A piece of aluminum (3.6 g) is heated from 20oC to 30oC. If the specific heat of aluminum os 0.897 J/goC, how much heat energy was absorbed?
    • A. 

      322.92 J

    • B. 

      32.292 J

    • C. 

      3.2292

    • D. 

      3.6 J

  • 12. 
    A 150.0 g sample of metal at 75.0 C is added to 150.0 g of H2O at 15.0 C.  The temperature of the water rises to 18.3 C.  Calculate the heat capacity of the metal, assuming that all the heat lost by the metal is gained by the water.  The heat capacity of water is 4.18 J/g C
    • A. 

      0.22 J/ g C

    • B. 

      0.25 J/ g C

    • C. 

      0.23 J/ g C

    • D. 

      0.48 J/ g C

    • E. 

      0.43 J/ g C

  • 13. 
    A 150.0 g sample of metal at 75.0 C is added to 150.0 g of H2O at 15.0 C.  The temperature of the water rises to 18.3 C.  Calculate the heat capacity of the metal, assuming that all the heat lost by the metal is gained by the water.  The heat capacity of water is 4.18 J/g C
    • A. 

      0.22 J/ g C

    • B. 

      0.25 J/ g C

    • C. 

      0.23 J/ g C

    • D. 

      0.48 J/ g C

    • E. 

      0.43 J/ g C

  • 14. 
    True or false:  The change in enthalpy for an exothermic process is positive.
    • A. 

      True

    • B. 

      False

  • 15. 
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  • 16. 
    Sodium hydrogen carbonate decomposes to form sodium carbonate, water, and carbon dioxide gas.  The heat of reaction for this decomposition is 129 kJ.  What is the change in enthalpy when 2.24 mol of sodium hydrogen carbonate react?
    • A. 

      5.7 kJ

    • B. 

      144 kJ

    • C. 

      -898 kJ

    • D. 

      -144 kJ

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