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Date: 16/01/2013

Title: To investigative the Energy Content of Different Foods.

Identifying the problem:

The energy content of a food sample, of known mass, was investigated by using a single calorimeter and the word equation below: Heat energy (J) = Mass (g) x Specific heat capacity of water (4.25/g°C for water) x Change in temperature (°C). Dividing the resulting energy value by grams of food burned gives the energy content (in J/g).

I predict that that the Brazil nuts will have the highest energy content and the cheerios will have the lowest.

Experimental Design:

For this experiment the food samples (brazil nuts, cheerios and yoghurt-coated wheat) were each weighed and set on fire 3 times.

Brazil nuts (Sample A): 3 Brazil nuts were taken and each weighed individually. Their weights were written down. Then 20ml of tap water was measured in a measuring cylinder and then the water was poured into a test-tube and the temperature of the water was measured. The test-tube was placed on a stand and the first food sample was lit on with a glowing stick that had been lit by a match. The food sample was kept under the test-tube until the flame burned out. Once the flame burned out, the temperature of the water was taken and written down. This procedure was repeated three time with all three Brazil nuts individually.

Cheerios (Sample B): 3 Cheerios were taken and each weighed individually. Their weights were written down. Then 20ml of tap water was measured in a measuring cylinder and then the water was poured into a test-tube and the temperature of the water was measured. The test-tube was placed on a stand and the first food sample was lit on fire with a glowing stick which had been lit on fire by a match. The food sample was kept under the test-tube until the flame burned out. Once the flame burned out, the temperature of the water was taken and written down. This procedure was repeated three time with all three Cheerios individually....
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