Which statement explains why the rate of a reaction increases when the temperature is increased?
The collision frequency increases because there is a decrease in the activation energy.
The proportion of successful collisions increases because there is a decrease in the activation energy.
The collision frequency increases because there is a decrease in the average kinetic energy of the particles.
The proportion of successful collisions increases because there is an increase in the fraction of particles with energy greater than or equal to the activation energy.
16 exam-style questions on AQA A Level Chemistry Kinetics, covering Collision theory, Maxwell–Boltzmann distribution, Effect of temperature on reaction rate, Effect of concentration and pressure, and Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.