C3.3 Calculating and explaining energy change

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The relative amounts of energy released when substances burn can be measured bysimple calorimetry, eg by heating water in a glass or metal container.

This is the equation used the calculate the energy released Q = mcΔT

Energy is normally measured in Joules (J)

Energy values could be given in kJ or calories for a given mass or amount of substance

The energy released or absorbed by a chemical reaction in a solution can be calculated from the measured temperature change of the solution when the reactants are mixed in an insulated container

  • This method can be used for reactions of solids with water or for neutralisation reactions

Calorimetry Experiment:

spirit burner heats water in a calorimeter (like a beaker), temperature taken by thermometer in calorimeter (http://www.bbc.co.uk/staticarchive/33a827cfe4ec963e09165ab2e6a1abed60856614.gif)

1. Cold water is measured into a copper calorimeter - a small metal can

2. The starting temperature of the water is recorded


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