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Exothermic and Endothermic reactions

Exothermic reactions GIVE OUT / transfer energy to the surroundings usually in the form of
heat usually shown by a rise in temperature as they cause the reaction mixture and the
surroundings to become hotter.

Endothermic reactions TAKE IN heat energy from the surroundings usually shown…

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Exothermic and Endothermic

In exothermic and endothermic reactions the starting materials have to be decomposed by
breaking chemical bonds (overcoming forces of attraction)to release the elements so that
they can recombine in a different way to make the product.

During the chemical reaction old bonds are broken and new bonds…

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In order for a chemical reaction to occur the reacting particles need to collide with enough
energy to start the reaction. The minimum amount of energy needed to start a reaction is
called the activation energy. Catalysts work by lowering the activation energy.


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