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Exothermic > energy given out to surroundings, results in temperature increases

Endothermic > energy taken in by surroundings, results in temperature decrease

Breaking bonds > endothermic

Making bonds > exothermic

In an exothermic reaction the energy released by forming bonds is greater than the energy required to break bonds.

In an endothermic reactions the every required to break bonds is greater than the energy released through making bonds.


Different fuels release different amounts of energy. 
Carlorimetry measures the amount of energy released when a fuel is burnt.

You burn the fuel and use the flame to heat water, and record the temperature.

Energy transferred (J) = Mass of water (g) * Specific heat capacity of water (4.2) * Temperature change (degrees C)


Burning fuels has effects on the environment.


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