Chemistry study notes
Rate of Reactions
Explain why reactions speed up, and read what a progress graph actually proves.
O-Level 6092 (2026) / SEC G3 K324 (2027)
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5 topicsExplain a rate change using collisions
Changing a condition changes how often particles react.
Choose a changing quantity
Match the measurement to the reaction.
Read slope and final amount separately
A plateau means product formation has stopped, not that nothing happened.
Catalysts provide an easier reaction pathway
They change the rate without being used up overall.
Pure onlyPlan a fair rate investigation
A plan must say how the measurements will support a conclusion.
Pure only
Scope
Learning outcomes
10. Rate of Reactions (6092 / K324). Use the outcome map to find the explanation for a particular syllabus requirement.
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10(a) Explain rate factors
- Concentration
- Gas pressure
- Particle size/surface area
- Temperature
- Collisions between reacting particles
10(b) Define catalysts and their effects
- Rate increase
- Chemically unchanged overall
- Enzymes included
10(c) Explain lower activation energy
- Alternative pathway
- More successful collisions
10(d) Recognise catalyst applications
- Industrial processes
- Enzymes as biological catalysts
10(e) Design rate investigations
- Choose variable and method
- Control confounders
- Measurements and analysis
10(f) Interpret rate data
- Volume/mass/time measurements
- Gradient and plateau
- Measurement limitations
Choose a changing quantityRead slope and final amount separately