A student measures the volume of oxygen made when 50 cm350\,\mathrm{cm^{3}}50cm3 of hydrogen peroxide solution decomposes with no catalyst.
The student repeats the experiment using 25 cm325\,\mathrm{cm^{3}}25cm3 of the same hydrogen peroxide solution and adds a catalyst. The temperature is the same.
How do the results of the second experiment compare with those of the first?
Initial rate is greater and total volume of oxygen is halved.
Initial rate is greater and total volume of oxygen is the same.
Initial rate is lower and total volume of oxygen is halved.
Initial rate is lower and total volume of oxygen is the same.
56 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.