AQA Chemistry Rates of Reaction Revision Notes
Master AQA Chemistry Rates of Reaction using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Rates of reaction refer to how quickly reactants are converted into products in a chemical reaction. Understanding these rates is crucial for controlling reactions in industrial processes and laboratory settings.
Key Concepts
- 1The rate of reaction can be affected by concentration, temperature, surface area, and the presence of a catalyst.
- 2The collision theory explains that reactions occur when particles collide with sufficient energy and proper orientation.
- 3Measuring the rate of reaction can be done by observing changes in mass, volume, or color over time.
- 4The rate equation relates the rate of a reaction to the concentration of reactants and the rate constant.
- 5Catalysts increase the rate of reaction without being consumed by lowering the activation energy.
Simple Explanation
The rate of reaction tells us how fast a chemical reaction happens. It can change based on things like how concentrated the reactants are, the temperature, and whether a catalyst is used. By measuring how quickly the reactants turn into products, we can understand and control the reaction better.
Memory Trick
“Remember 'CATS' for factors affecting reaction rates: Concentration, Area (surface area), Temperature, and Speed (catalysts).”
Flashcards
What factors affect the rate of reaction?
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Exam Questions
Describe and explain how temperature affects the rate of reaction. [6 marks]
6 marksView mark scheme hint▾
Discuss the kinetic theory, how increased temperature increases energy and collision frequency, and provide examples.
Explain how a catalyst increases the rate of a reaction. [4 marks]
4 marksView mark scheme hint▾
Mention activation energy, how catalysts provide an alternative pathway, and their effect on reaction rates.
What is meant by the term 'rate of reaction'? [2 marks]
2 marksView mark scheme hint▾
Define the rate of reaction and mention its measurement.
Practice Quiz
Which factor does NOT affect the rate of reaction?
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