A student adds 1 g of a solid, Q, to some hydrogen peroxide solution. Oxygen is made faster than without Q.
The total volume of oxygen collected is twice the volume collected from the same hydrogen peroxide solution without Q.
Which conclusion is correct?
Q is a catalyst, because it increases the rate of the reaction.
Q is a catalyst, because catalysts increase the amount of product made.
Q is not a catalyst, because a catalyst does not change the amount of product, so Q must also be reacting.
Q is not a catalyst, because a catalyst would make the reaction produce less oxygen.
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.