i. What is a heterogeneous catalyst?
ii. Explain briefly the different stages involved when a heterogeneous catalyst helps to speed up the reaction between compounds in a catalysed reaction.
iii. Explain why transition metals are often good heterogeneous catalysts.
i. What is a selective catalyst?
ii. Explain the structural features of zeolites that make them good as selective catalysts.
3. Using a diagram to illustrate your answer, explain how the concept of “activated complex” or “reaction intermediate” help a homogeneous catalyst speed up a chemical reaction.