A student increases the temperature of a reaction mixture. The rate of reaction increases.
Which statement explains why?
The activation energy falls, so more collisions have enough energy.
The particles collide more often and more collisions have enough energy.
The particles become bigger, so they collide with each other more often.
There are more reactant particles packed into the same volume.
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.