Quiz  /  Bond Energy Class 10 MCQ Questions With Answers

  • 1. 
    Is this equation endo- or exo-thermic?2KNO3 (s) + energy --> 2KNO2 (s) + O2

  • endothermic
  • exothermic

  • 2. 
    Using the table of average bond energies below the image, the ΔH for the reaction in kJ is.....

  • + 160 kJ
  • -63 kJ
  • - 160 kJ
  • -217 kJ

  • 3. 
    Which is an example of an endothermic physical reaction?

  • a) Ice melting
  • b) Combustion
  • c) Steam condensing
  • d) Photosynthesis

  • 4. 
    The following equation shows the formation of magnesium oxide from magnesium metal. Which statement is correct for this reaction?2Mg(s) + O2(g) → 2MgO(s) ΔH = -1204 kJ

  • 1204 kJ of energy are released for every mole of magnesium reacted
  • 602 kJ of energy are absorbed for every mole of magnesium oxide formed
  • 602 kJ of energy are released for every mole of oxygen reacted
  • 1204 kJ of energy are released for every two moles of magnesium oxide formed

  • 5. 
    For the reaction 2H2(g) + O2(g) → 2H2O(g) the bond enthalpies (in kJ/mol) are H-H = x, O=O = y, O-H = zWhich calculation will give the value, in kJ/mol, of ΔH for the reaction?

  • 2x + y - 2z
  • 4z - 2x - y
  • 2x + y - 4z
  • 2z - 2x - y

  • 6. 
    Is this equation endo- or exo-thermic?PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy

  • endothermic
  • exothermic

  • 7. 
    Does breaking bonds require energy, release energy, or not involve energy at all?

  • requires energy to break
  • releases energy when broken
  • No energy involved

  • 8. 
    In the image above, this number represents the activation energy:

  • 1
  • 2
  • 3

  • 9. 
    If you hold a container where a chemical reaction is taking place and it feels warm to you, this reaction is:

  • endothermic
  • exothermic
  • isothermic
  • what?

  • 10. 
    How much energy is required to break all of the bonds in the first molecule depicted in the reaction above? (you must include the proper sign for credit)

  • +2,826 kJ
  • -2826 kj
  • +2826
  • None of these

  • 11. 
    In the graph above, is the reaction depicted exothermic or endothermic?

  • exothermic
  • endothermic

  • 12. 
    Use the chart to calculate the ΔE\Delta EΔE for the reaction below (include unit): C2H4 + F2 → C2H4F2C_2H_4\ +\ F_2\ \rightarrow\ C_2H_4F_2C2​H4​ + F2​ → C2​H4​F2​

  • 549 kJ
  • 549k
  • -549 kJ
  • None of these

  • 13. 
    Kuppler has a dog. His dog's name is:

  • Piper
  • Chloe
  • Rex
  • Fido

  • 14. 
    Kuppler went to college to become a teacher. What college did Kuppler attend?

  • Rowan University
  • University of Pennsylvania
  • The College of NJ (TCNJ)
  • Stockton College

  • 15. 
    Using the reaction & table above, determine the change in energy and whether or not the reaction is endothermic or exothermic:

  • -2054 kJ endothermic
  • 2045 kJ endothermic
  • -2045 kJ exothermic
  • 2045 kJ exothermic

  • 16. 
    The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below?H-O-O-H(g) → H-O-H(g) + ½O=O(g)

  • -102
  • +102
  • +350
  • +394

  • 17. 
    This is the number of years that Kuppler has been teaching at Kingsway:

  • 3 years
  • 5 years
  • 9 years
  • 10 years
  • 15 years

  • 18. 
    On the chart reaction diagram above, #4 represents:

  • the energy of the reactants
  • the energy of the products
  • the energy of the intermediates
  • the energy change for the reaction
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