Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

At $20\,^{\circ}\text{C}$, hydrogen peroxide breaks down slowly to give water and oxygen. $2\text{H}_2\text{O}_2 \rightleftharpoons 2\text{H}_2\text{O} + \text{O}_2 \qquad \text{equilibrium constant} = K_c$ This reaction proceeds more quickly in the presence of a catalyst. Which statement is correct?

  • AThe catalyst alters the Boltzmann distribution so that the reactant molecules have more energy.
  • BThe catalyst has no effect on the value of $K_c$.
  • CThe catalyst increases the value of $K_c$.
  • DThe catalyst provides a different reaction mechanism with a higher activation energy.

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