Reaction kinetics written questions
Practise H1 Chemistry rates, reaction conditions and collision theory, with marking guidance for written explanations.
Learning goals
- Explain and use rate of reaction, rate equation, order of reaction, rate constant, half-life, activation energy and catalysis
- Deduce the orders in a rate equation by the initial rates method
- Justify whether a reaction is zero or first order from a concentration–time graph
- Calculate an initial rate from concentration data using a rate equation
- Explain why the half-life of a first-order reaction does not depend on concentration
- Explain how changing concentration affects reaction rate using collision frequency
- Explain activation energy using the Boltzmann distribution
- Explain how temperature affects the rate constant, and so the rate, using the Boltzmann distribution and collision frequency
- Explain that a catalyst gives a reaction a pathway of lower activation energy and so a larger rate constant
- Interpret a catalyst's effect using the Boltzmann distribution
- Outline how heterogeneous catalysis works, using the removal of nitrogen oxides from car exhaust gases
- Describe enzymes as protein catalysts with high specificity, explained by the lock-and-key model, and sensitivity to temperature and pH
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Beyond the syllabus: optional enrichment that does not count towards your progress.