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GCSE C 5

Topic 5 - Energy Changes

TermDefinition
Activation energy The minimum amount of energy for particles to collide with in order for a successful reaction to occur.
Endothermic reaction An endothermic reaction is one that takes in energy from the surroundings so the temperature of the surroundings decreases. In an endothermic reaction, the energy needed to break existing bonds is greater than the energy released from forming new bonds.
Exothermic reaction An exothermic reaction is one that transfers energy to the surroundings so the temperature of the surroundings increases. In an exothermic reaction, the energy released from forming new bonds is greater than the energy needed to break existing bonds.
Overall energy change of the reaction The difference between the sum of the energy needed to break bonds in the reactants and the sum of the energy released when bonds in the products are formed.
Reaction profile Reaction profiles can be used to show the relative energies of reactants and products, the activation energy and the overall energy change of a reaction.
Created by: Windypicks
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