#116
4.6.1.1 Calculating rates of reactions
Paper 2 · Higher combined
Spec reference: 4.6.1.1 (under 4.6.1).
What you need to know
- Measuring the Volume of a Reaction Mixture
- Reactions happen at varying rates. For example,
- The changing volume of a reaction mixture can be measured during a reaction. This method is particularly
- a firework exploding is a fast reaction whereas a
- useful when gases, such as carbon dioxide, are given off. The gas can be collected and its volume measured
- piece of iron rusting would take place over a longer
- at regular time intervals. Different types of measuring equipment can be used to collect the gas such as a gas
- period of time.
KO match: Calculating Rates of Reactions
Support videos
- FreeScienceLessons (topic playlist): (use links below)
- PMT videos hub (Rate & extent): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/rate-and-extent-of-chemical-change/
Self-assessment (checklist)
- I can explain what is meant by ‘conservation of mass’ in
- I can balance symbol equations in terms of the
Key steps (method)
- Identify what the question is testing and use precise chemistry vocabulary.
- If it’s a calculation: write the equation/formula first, then substitute carefully.
Common mistakes
- Missing units/state symbols when asked.
- Giving a statement without linking cause → effect.
Exam-style questions (quick)
- Define the key term(s) for this point in the spec.
- Explain a typical property/result using particle/bonding ideas.
- Do a short calculation or interpretation step relevant to this point.
Practice questions
- PMT: Rate & extent (questions + notes): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/rate-and-extent-of-chemical-change/