An Investigation to find which foods have the most energy content

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An Investigation to find which foods

have the most energy content 

We have three different types of biscuit with their nutritional content listed below but their energy values are missing. By burning a piece of biscuit and heating a known volume of water and recording the temperature change, we hope to show the energy value of each biscuit.

Biscuit Types 

Sponge fingers per 100g                            Oat and Wholemeal per 100g

Protein                  8.2g                             protein                         7.7g

COH                     84.7g                             COH                            64.2g

Fat                        3.6g                             Fat                              21.6g

  Rich Tea         per 100g

  Protein                  7.9g

  COH                     78.1g

  Fat                        7.4g

Apparatus

Test-tube, clamp + stand, heatproof mat, goggles, foods, thermometer, measuring cylinder, water and Bunsen burner.

Method

First set apparatus up as above then pour 15ml of water into a measuring cylinder and pour into the test –tube you are going to heat. Then take the temperature of the water in the test-tube and write the temperature in the table which has room for 3 tests on each food and 5 columns with the name of the food the temp before, temp after, weight before and weight after. Then take your sponge finger and weigh a small piece of it. Then place the sponge in the flame and light the sponge next hold the lighted food under the test tube until the food goes out. Then stir the water and take the temperature of the water with the thermometer and write down the temp. Wait until the food cools down then weigh the burnt biscuit and write it down in the results table. Repeat this three times for each of the three pieces of the sponge biscuit then do the same for the other 2 biscuits.

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Fair test

We will try to have the same conditions for each test. We will do this by using the same amount of water [15ml], which is around the same temperature as all the other test tubes before the lighted food is put under them.

We will try to use the same amount of food each time we burn it.

Safety  

I will wear goggles to protect my eyes when working with burning food and keep my fingers well away from burning food.

 

Prediction

I predict that the biscuit with the most ...

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