Chapter 17 Thermochemistry

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Thermochemistry Quizzes & Trivia
Chapter 17 THERMOCHEMISTRY

  
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  • 1. 
    The SI unit of energy is
    • A. 

      Heat capacity.

    • B. 

      Calorie.

    • C. 

      Joule.

    • D. 

      Enthalpy.


  • 2. 
    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


  • 3. 
    If 1 Calorie  4.18 kJ, how many kJ of energy can be released by an apple containing 125 Cal?
    • A. 

      522 kJ

    • B. 

      29.9 kJ

    • C. 

      5.22  105 kJ


  • 4. 
    The temperature of a 6.0-g sample of glass changed from 20C to 45C when it absorbed 550 J of heat. What is the specific heat of this glass sample?
    • A. 

      C0.27 J/gpC

    • B. 

      3.7 J/gp

    • C. 

      2300 J/gpC


  • 5. 
    The enthalpy of a system is the same as its:
    • A. 

      Specific heat.

    • B. 

      Heat of combustion.

    • C. 

      Heat content.


  • 6. 
    When your body is warmed by an electric blanket during the winter, this process is said to be
    • A. 

      Endothermic.

    • B. 

      Exothermic.

    • C. 

      Isothermic.


  • 7. 
    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


  • 8. 
    Given the equation 2Mg(s)  O2(g) y2MgO(s)  72.3 kJ, which of the following is true?
    • A. 

      The reaction is endothermic.

    • B. 

      ^H72.3 kJ

    • C. 

      ^H72.3 kJ


  • 9. 
    Given the equation in question 18, how much heat is involved in the production of 5.0 mol of MgO?
    • A. 

      72 kJ

    • B. 

      360 kJ

    • C. 

      180 kJ


  • 10. 
    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


  • 11. 
    Which of the following statements is true?
    • A. 

      ^Hfus^Hsolid

    • B. 

      ^Hfus^Hsolid

    • C. 

      ^Hsolid is always positive.


  • 12. 
    How much heat, in kJ, is required to melt 54.0 g of ice at 0C into water at 0C if ^Hfus for water = 6.01 kJ/mol?
    • A. 

      0.111 kJ

    • B. 

      325 kJ

    • C. 

      18.0 kJ


  • 13. 
    How much heat is required to convert 9.00 g of water at 100C into steam at 100C, if ^Hvap for water = 40.7 kJ/mol?
    • A. 

      20.4 kJ

    • B. 

      366 kJ

    • C. 

      18.0 kJ


  • 14. 
    If the molar heat of solution of NH4NO3 is 25.7 kJ/mol, how much heat (in kJ) would be required to dissolve 20.0 g of NH4NO3 in water?
    • A. 

      0.250 kJ

    • B. 

      514 kJ

    • C. 

      6.43 kJ


  • 15. 
    Calculate the enthalpy change, H in kJ, for the reaction H2O(s) ---->H2(g) + 1/2O2(g) Use the following: H2(g) + 12O2(g) ---->H2O(l)     ^H= 285.9 kJ H2O(s) yH2O(l) H+6.0 kJ
    • A. 

      291.9 kJ

    • B. 

      +291.9 kJ

    • C. 

      279.9 k


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