The Rate and Extent of Chemical Change Exam Questions
Questions on calculating rates of reaction, factors affecting rate, collision theory, catalysts, reversible reactions, and dynamic equilibrium including Le Chatelier principle. Download free past paper questions organised by topic with mark schemes.
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Frequently Asked Questions
What factors affect rate of reaction GCSE?
Four factors: Temperature (higher = faster), Concentration/pressure (higher = faster), Surface area (larger = faster), and Catalysts (speed up without being used up). All explained by collision theory.
What is collision theory GCSE?
For a reaction to occur, particles must: 1) Collide, and 2) Have enough energy (activation energy). Increasing temperature, concentration, surface area, or using catalysts increases successful collisions.
What is dynamic equilibrium GCSE?
In a closed system, reversible reactions reach equilibrium where the rate of forward reaction equals the rate of backward reaction. Concentrations stay constant but reactions continue in both directions.
What is Le Chatelier principle GCSE?
If conditions change, equilibrium shifts to oppose the change. Higher temperature favours endothermic direction. Higher pressure favours fewer gas molecules. Catalysts do NOT affect equilibrium position.
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