EDEXCEL CHEMISTRY ADDITIONAL C2 ENDOTHERMIC AND EXOTHERMIC REACTIONS

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Endothermic and Exothermic Reactions

Exothermic is when chemical energy is transferred to heat energy, so the temperature rises.

Endothermic is when heat energy is transferred to chemical energy, so the temperature falls.

In exothermic reactions the bonds are broken between reactant atoms, but less energy is taken in to break the bonds than energyy that is given out once the bonds are made, this makes the reaction exothermic as more heat energy is released.

In endothermic reactions, the bonds are broken between the reactant atoms, and more energy is taken in to break the bonds than is given out as heat energy when the bonds are made. This makes the reaction endothermic.

Measuring Change

You can measure the energy change in a reaction, from the reactant to the product by following a simple method:

1. Place the solution of reactant 1 in an insulated cup. The insulated

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