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EnglandChemistryQuick questions
Topic 7: Rates of reaction and energy changes
Quick questions on Rate of reaction and collision theory - Edexcel GCSE Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is concentration?Show answer
A higher concentration means more particles in the same volume, so they collide more frequently, and the rate increases.
What is pressure?Show answer
Increasing the pressure squeezes the gas particles closer together, so again they collide more frequently, and the rate increases.
What is surface area?Show answer
Breaking a solid into smaller pieces or a powder increases the surface area to volume ratio, exposing more particles, so there are more frequent collisions at the surface, and the rate increases.
What is temperature?Show answer
Raising the temperature gives particles more kinetic energy, so they move faster and collide more frequently. More importantly, a greater proportion of collisions have energy greater than or equal to the activation energy, so more collisions are successful. Temperature has a large effect for this reason.
What is q1?Show answer
Define the activation energy. [1 mark]
What is q2?Show answer
Explain why increasing the pressure of a gas reaction increases the rate. [2 marks]
What is q3?Show answer
State two things, besides enough energy, that a successful collision requires. [2 marks]
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