C7-Energy transfer in reactions!

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• Created by: 94Y86
• Created on: 15-05-12 08:44

ENERGY TARNSFER IN REACTION

there are two types of reactions, EXOTHERMIC AND ENDOTHERMIC REACTIONS.

EXOTHERMIC

• gives out energy to the surroundings usually in the form of heat
• an exothermic reaction can be found be  an increase in temperature
• a way of remembering this is:
• EXO- exit
• THERMIC- heat
• meaning that heat exits the reaction.

EXAMPLE:

• fossil fuels burning
• neutralisation reactions

ENDOTHERMIC

• Takes in energy from the surrondings usually in the form of heat
• an endothermic reaction is usually seen by a decrease in temperature
• there is no obvious way of remembering this one but if u make sure u understand EXOTHERMIC REACTIONS you will easily understand ENDOTHERMIC because its the opposite.

EXAMPLE:

• Photothenisis

ENERGY LEVEL DIAGRAMS

Exothermic:

• in an Exothermic reaction the products are always below the reactants this is because it gives out energy…