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Question: "Explain why increasing the temperature increases the rate of reaction." (4 marks)
When the temperature increases, the particles gain more kinetic energy and move faster. [1] This means the particles collide more frequently — more collisions occur per second because the particles are moving around more quickly. [1] In addition, a greater proportion of the particles now have energy greater than or equal to the activation energy. [1] As a result, more collisions are successful — they lead to a reaction — so the rate of reaction increases. [1]
Examiner note: This question has four distinct mark points and students must address all four for full marks. The most common mistake is stopping after "particles move faster" and "collide more often" — this only scores 2 marks. The third and fourth points (more particles exceed activation energy, therefore more successful collisions) are essential and are the marks that separate grade 6 from grade 7-9 answers. Avoid vague phrases like "particles have more energy" without specifying kinetic energy.
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