This definitions covers Key Definitions within Factors Affecting Rate for GCSE Chemistry. Revise Factors Affecting Rate in Rates of Reaction for GCSE Chemistry with 20 exam-style questions and 18 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 13 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 7 of 13
Practice
20 questions
Recall
18 flashcards
📖 Key Definitions
Concentration: The amount of a substance dissolved in a given volume of solution (measured in mol/dm³). Higher concentration means more solute particles per unit volume.
Surface area: The total area of a solid that is exposed and available to react. Smaller particles have a greater surface area-to-volume ratio.
Catalyst: A substance that increases the rate of a reaction by providing an alternative reaction pathway with a lower activation energy. A catalyst is not consumed in the reaction and can be reused.
Enzyme: A biological catalyst — a protein molecule that speeds up reactions in living organisms. Enzymes are specific to one reaction and have an optimum temperature and pH.