Chemistry Se 11 C

6 Questions | Total Attempts: 110

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Chemistry Se 11 C

Questions and Answers
  • 1. 
    Which of the following applies to an exothermic reaction?
    • A. 

      Hfinal < Hinitial ∆H < 0

    • B. 

      Hfinal < Hinitial ∆H > 0

    • C. 

      Hfinal > Hinitial ∆H > 0

    • D. 

      Hfinal > Hinitial ∆H < 0

  • 2. 
    A change in the internal energy of a system at constant pressure from a chemical reaction will result in an identical change in the —
    • A. 

      Enthalpy of the system

    • B. 

      Entropy of the system

    • C. 

      Free energy of the system

    • D. 

      Specific heat of the system

  • 3. 
    Which of the following equations is an exothermic reaction?
    • A. 

      H2 (g) + ½ O2 (g) → H2O (l) ΔH = -285.8 kJ

    • B. 

      HgO (s) → Hg (l) + ½ O2 (g) ΔH = +90.7 kJ

    • C. 

      4CO2(g) +6H2O(l) →2C2H6(g) +7O2(g) ΔH =+3120 kJ

    • D. 

      SO2 (g) → S(s)+ O2 (g) ΔH = +296 kJ

  • 4. 
    A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation?
    • A. 

      An endothermic reaction occurred.

    • B. 

      A dehydration reaction occurred.

    • C. 

      The water was originally warmer than the compound.

    • D. 

      The beaker was contaminated by another compound.

  • 5. 
     The table below shows the standard enthalpy of formation for each of three substances.CaCO decomposes according to the equation CaCO3 (s) --> CaO(s) + CO2 (g). What is the enthalpy of reaction?
    • A. 

      177.8 kJ

    • B. 

      -177.8 kJ

    • C. 

      −1029 kJ

    • D. 

      −2236 kJ

  • 6. 
    What is the term for the amount of energy absorbed or released in a chemical reaction?
    • A. 

      Heat of reaction

    • B. 

      Heat of vaporization

    • C. 

      Heat of condensation

    • D. 

      Heat of sublimation

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