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					Higher Chemistry

Unit 1
Section 2 Enthalpy
Multiple Choice Questions


  This is designed to be used by teachers to help students develop
  skills in answering multiple choice questions.
     Higher Chemistry
     Unit 2 - Section 2 Enthalpy
     Multiple Choice Questions

1.    The potential energy diagram for the reaction
      CO(g) + NO2(g) -> CO2(g) + NO(g)
      is shown.




      DH, in kJmol-1, for the forward reaction is
      A. -361         B. -227      C. -93         D. +361



      Answer                                                A.
     Higher Chemistry
     Unit 2 - Section 2 Enthalpy
     Multiple Choice Questions

2.    The enthalpy of neutralisation in an
      acid/alkali reaction is always the energy
      released in

      A.            the neutralisation of one mole of acid
      B.            the neutralisation of one mole of alkali
      C.            the formation of one mole of water
                    from one mole of H+ and OH- ions
      D.            the formation of one mole of salt

      Answer                                              C.
     Higher Chemistry
     Unit 2 - Section 2 Enthalpy
     Multiple Choice Questions

3.    Ethanol- (C2H5OH) has a different enthalpy
      of combustion from diethyl ether
      (CH3OCH3) because the compounds have
      different

      A.            molecular masses
      B.            bonds within the molecules
      C.            products of combustion
      D.            boiling points

      Answer                                     B.
     Higher Chemistry
     Unit 2 - Section 2 Enthalpy
     Multiple Choice Questions

4.    Which of the following represents an
      exothermic change?

      A.            O2(g)          2O(g)
      B.            CH4(g)         C(g) + 4H(g)
      C.            2N(g)          N2(g)
      D.            H2O(g)         2H(g) + O(g)



      Answer                                      C.
     Higher Chemistry
     Unit 2 - Section 2 Enthalpy
     Multiple Choice Questions

5.



      The enthalpy change for the forward
      reaction can be represented by
      A.     x
      B.     y
      C.            x+y
      D.            x-y

      Answer                                B.

				
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