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C2.4 Glossary

Rates and Energy Glossary

TermDefinition
Catalyst A substance that speeds up a chemical reaction but remains chemically unchanged itself at the end of the reaction.
Collision Theory An explanation of chemical reactions in terms of reacting particles colliding with sufficient energy for a reaction to take place.
Endothermic A reaction that takes in energy from the surroundings.
Exothermic A reaction that gives out energy to the surroundings.
Activation Energy The minimum energy needed to start off a reaction.
Created by: ChosenHill