Determining the energy in foods

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Presentation transcript:

Determining the energy in foods CALORIMETRY Determining the energy in foods Haileybury Astana IGCSE Science

Calorimetry Energy = change in temperature x 25cm3 x 4.2J Weigh the food Measure out 25ml of water Measure the starting temperature of the water Ignite the food Place the burning food beneath the test tube of water Measure the temperature at the end Use the formula to determine the energy content of the food Food Mass Start temperature End temperature Change in temperature Energy = change in temperature x 25cm3 x 4.2J Mass of the food` Error analysis: Are the values too high or too low? List the sources of error.

Bomb Calorimeter