Hydrogen peroxide solution decomposes slowly. A student added manganese(IV) oxide powder and the reaction became much faster. The equation for the reaction is 2 H2O2→2 H2O+O22\ \text{H}_2\text{O}_2 \rightarrow 2\ \text{H}_2\text{O} + \text{O}_22 H2O2→2 H2O+O2. What does this equation show about the manganese(IV) oxide?
It is a reactant in the decomposition
It is a product of the decomposition
It raises the activation energy needed
It is a catalyst for the decomposition
41 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.