AS Physical Chemistry Revision

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1. In which of the following cases will pressure affect the position of equilibrium?

  • Homogenous, aqueous, equal number of moles on both sides
  • Homogenous, gaseous, more moles on the left
  • Heterogenous, gaseous, more moles on the left
  • Homogenous, gaseous, equal number of moles on both sides
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2. Write an expression for Kc for the following reversible reaction: 2NO (g) + O2 (g) -> N2O4 (g).

  • mol2dm-6
  • moldm-6
  • mol-2dm6
  • moldm-3

3. What is the standard enthalpy change of combustion of 37g of 2-chlorobutane that heats 2.5dm3 of water from 20'C to 41.5'C?

  • -5644kJmol-1
  • -5643 kJmol-1
  • 5644 kJmol-1
  • -564.4 kJmol-1

4. Define the term Equilibrium.

  • Rate of forward reaction is equal to the rate of the backward reaction.
  • A reversible reaction in which the amount of each reactant / product remains constant.
  • A reversible reaction in which the amount of each reactant remains constant.
  • A reversible reaction in which the rate of each reaction remains constant.

5. How does a homogenous catalyst provide a pathway of lower activation energy?

  • Has an active site
  • Chemisorption
  • Forms an intermediate
  • Lowers the enthalpy change
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