Which of the following did your answer include? - The metal probably increases reaction rate by either holding reactant molecules in the correct orientation to react or by weakening or breaking bonds in reactant molecules to make them more reactive.

- This is an example of heterogeneous catalysis.

- It is heterogeneous catalysis because the catalyst is a solid and the reactants are gases. In
heterogeneous catalysis, the catalyst is in a different phase than the reactants.