Exothermic and Endothermic Reactions

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When a chemical reaction occurs, energy is transferred to, or from, the , and there is often a temperature change.

When a fire burns it transfers energy to the surroundings. Objects near the fire become . The temperature rise can be measured with a .

Exothermic reactions transfer energy the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become .
The increase can be detected using a thermometer.

Endothermic reactions take in energy the surroundings. The energy is usually as heat energy, causing the reaction mixture and its surroundings to get colder.
The temperature can also be detected using a thermometer.