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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 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 ...read more.


transferred Crisps: = 20 x 0.004182 x 17.5 = 1.46 KJ transferred Kit Kat: = 20 x 0.004182 x 19.5 = 1.63 KJ transferred This means that: 0.84g of bread released 1.4 KJ of energy 1.71g of rice cakes released 0.96 KJ of energy 1.39g of crackers released 2.86 KJ of energy 0.96g of crisps released 1.46 KJ of energy 2.38g of Kit Kat released 1.63 KJ of energy Now I will find the amount of energy released per gram of food: Bread = 1.4/1.59 = 0.88 KJ released per gram of food Rice cake: = 0.96/1.9 = 0.51 KJ released per gram of food Cracker: = 2.86/1.55 = 1.85 KJ released per gram of food Crisps: = 1.46/1.04 = 1.40 KJ released per gram of food Kit Kat: = 1.63/2.68 = 0.61 KJ released per gram of food Now I am going to compare these values with the energy values given: Bread: 9.6 KJ Rice cake: 3.2 KJ Cracker: 7.4 KJ Crisps: 18.7 KJ Kit ...read more.


out, the crisps were hard to burn because they cracked when you tried to spear them on a mounted needle and a lot of the Kit Kat was melted in the hot flames of the Bunsen burner when I tried to get it alight. The other possible error could have been that when I changed the water, the boiling tube might have still been hot, so it would have warmed up the water before I even started to heat it Possible improvements: If I could have done this experiment again, I would have made a number of improvements: * Use spoons to replace the mounted needle; so the rice cake and the crisps would not fall apart * Use a smaller flame while trying to get the Kit Kat alight so it would not melt as quickly * Use a new boiling tube every time for each different food to minimize the amount of heat that would be transferred from the boiling tube to the water. ...read more.

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