A student adds 0.50 g of a metal oxide powder to a reaction mixture. The rate of reaction increases. The student thinks the metal oxide is a catalyst.
How could the student show that the metal oxide is not used up in the reaction?
Measure the volume of gas made every 10 seconds.
Measure the temperature before and after the reaction.
Filter, dry and weigh the oxide at the end, then compare masses.
Repeat the experiment without the oxide and compare the rates.
122 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.