A student investigated the rate of decomposition of hydrogen peroxide, H2O2H_2O_2H2O2, using a manganese(IV) oxide catalyst:
2H2O2(aq)→2H2O(l)+O2(g) 2\text{H}_2\text{O}_2(\text{aq}) \rightarrow 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g}) 2H2O2(aq)→2H2O(l)+O2(g)a.[2]
Describe a chemical test to identify the gas produced in this reaction and give the expected positive result.
b.[3]
Using the graph below, determine the mean rate of reaction in cm3/s\text{cm}^3/\text{s}cm3/s between 2 and 5 minutes. Give your answer to 2 significant figures.
