The relative amounts of energy released when substances burn can be measured by simple calorimetry, e.g. by heating water in a glass or metal container.
You should be able to calculate and compare the amount of energy released by different fuels given the equation:
Q = mcΔT
This method can be used to compare the amount of energy released by fuels and foods.
The amount of energy released or absorbed by a chemical reaction in solution can be calculated from the measured temperature change of the solution when the reagents are mixed in an insulated container.
If the change in temperature is negative it is an exothermic reaction. If the change in temperature is positive it is an endothermic reaction.
This method can be used for reactions of solids with water or for neutralisation reactions.
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