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An Investigation to find which foods have the most energy content

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Introduction

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. ...read more.

Middle

Energy/g [in J] = vol of water heated x temp change c x 4.2 Change of mass of biscuit Summary Rich tea - 1410.447761 Average =943.00341623 - 766.4233577 - 652.173913 Sponge - 597.9710221 - 1063.555114 = 798.5839568 - 734.2257343 Oat - 492.8292047 - 724.8953975 = 608.8623011 - 5387.828162291 Analysis From this experiment we found that the oat biscuits should have had the most energy but our test results were wrong , they supposedly showed that the Rich Teas had the most energy and then the sponge biscuits then the oat biscuits. As the oat had the most fat and carbohydrates, it makes sense the biscuit will have the most energy because you get energy from those things. This means the prediction was right because of the fact that the oat and wholemeal was the one with the most energy. Most of our results agree with this but some were anomalous because the biscuit caught fire very quickly which meant the temperature went up considerably and some biscuits hardly burned at all. Evaluation I thought the test was good because it was fairly accurate for the temperature results but if you got an anomalous result like we did for the last oat biscuit then your average was not very accurate. ...read more.

Conclusion

When we were burning the food it didn't always just heat the test tube but heated the air around it as well so the water could have been hotter if we had just heated the water. We lost some heat from the water because some of the biscuits were difficult to keep alight so some times we had to go back and relight the food 2 or 3 times, in the time it took us to relight the food it could have cooled down by 1-3 degrees. I think the way we held the food was inaccurate because when the biscuit went soggy, it fell off the mounted needle and on to the bench and bits dropped off. It was difficult to keep the food burning as it kept falling off and, if it did set alight fiercely, it set the handle on fire so the wood burned as well as the biscuit. I think the best thing we could have used would have been a calorimeter because it would have given us the test results more accurately than we can do them and it would be a lot quicker to do 10 tests for each food in the time it took us to do three. ...read more.

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