GCSE Chemistry
Rate & Extent of Chemical Change
Rate & Extent of Chemical Change is a core strand in Chemistry. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
Rates of Reaction
Rates of Reaction becomes much more predictable when you connect the practical setup to collision theory.
Open guideCollision Theory
Collision theory states that for a chemical reaction to occur, the reactant particles must collide with each other with sufficient energy.
Open guideFactors Affecting Rate
Several factors can change the rate of a chemical reaction: temperature, concentration (or pressure for gases), surface area of solid reactants, and the presenc
Open guideReversible Reactions
A reversible reaction is a chemical reaction that can proceed in both the forward and reverse directions.
Open guideDynamic Equilibrium
Dynamic equilibrium occurs in a closed system when the rate of the forward reaction is equal to the rate of the reverse reaction.
Open guideLe Chatelier's Principle
Le Chatelier's principle states that if a change is made to the conditions of a system at equilibrium, the system will respond to counteract the change.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.