Amylase catalyses the breakdown of starch into sugars. The reaction also happens without amylase, but much more slowly.
Which statement describes how the reaction profile with amylase differs from the reaction profile without amylase?
The peak is lower, because amylase gives the reacting particles more energy.
The products are at a lower energy level, so more energy is released overall.
The reactants are at a higher energy level, so less extra energy is needed to react.
The peak is lower, but the reactants and products stay at the same energy levels.
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.