Why does increasing temperature increase both collision frequency and successful-collision frequency?
Particles become more concentrated even though the volume is unchanged
Particles move faster and more have at least the activation energy
The activation energy falls, so more collisions become successful
Particles move faster, so every collision now forms products
54 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.