Practice Catalyst in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A substance that increases the rate of a chemical reaction by providing an alternative pathway with lower activation energy, without being permanently consumed or chemically altered in the process.

A helper that makes the reaction easier but isn't used up in the process.

Example 1

easy
In the decomposition of hydrogen peroxide, \text{MnO}_2 acts as a catalyst: 2\text{H}_2\text{O}_2 \xrightarrow{\text{MnO}_2} 2\text{H}_2\text{O} + \text{O}_2. Explain the role of \text{MnO}_2.

Example 2

medium
Explain the difference between a homogeneous catalyst and a heterogeneous catalyst. Give one example of each.

Example 3

easy
Enzymes are biological catalysts. Does an enzyme change the \Delta H of a biochemical reaction?

Example 4

medium
A catalyst is added to a reaction and the reaction finishes faster. What changes, and what does not change about the reaction?
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