To investigate how much energy each type of food produces

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GCSE biology assessment by Brian Hon 10H

Aim:

To investigate how much energy each type of food produces

Method:

I gathered some food; a kit Kat, crackers, bread, chewies and some crisps; here are the weights of the foods before lighting:

Bread – 1.5                        1.67                1.59

Rice Cake – 2.86        0.93                1.9

Cracker – 1.22                           1.88                1.55

Crisps – 1.41                           0.67                1.04

Kit Kat – 2.63                          2.73                2.68

 I set up a boiling tube clamped to a stand and then used a Bunsen burner to light the food. The food caught fire and heated the water (at 24.5 degrees) inside the boiling tube. I then measure the temperature of the water after the food had burnt down and here are my results

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Bread – 44.5                38                41.25

Rice cake – 33                39                36

Cracker – 48                68                58                

Crisps – 46                38                42

Kit Kat – 40                48                44

I have also measured the mass before and after the energy transfer:

Bread: – 0.3                0.32        w        0.31

Rice cake: – 0.23         0.15                0.19

Cracker: – 0.11        0.2                0.16

Crisps: – 0.14                0.01                0.08

Kit Kat: – 0.2                0.4                0.3

To work out the mass change we can subtract the average mass left from the original average mass:

Bread = 1.15 – 0.31 = 0.84

Rice cake = 1.9 – 0.19 = 1.71

Cracker: = 1.55 – 0.16 = 1.39

Crisps: = 1.04 – 0.08 ...

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