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Experiment. How much energy is there in some foods that you eat?

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Introduction

How much energy is there in some foods that you eat? Type of food Mass/g Initial temperature/�C Highest temperature/�C Change in temperature/�C Jack n' Jill Chips 1.52 23.0 55.0 32.0 Digestive 9.22 23.0 103.0 80.0 Crackers 3.10 23.0 90.0 67.0 EDO 4.19 23.0 105.0 82.0 Table of results: Formula for energy value of food: Energy transferred/ J = mass of water/g � 4.2 � temperature rise/�C Weight of food/g To find the energy in Jack n' Jill chips we should substitute the values into the equation- 20 � 4.2 � 32.0 = 1768.42 J/g 1.52 The to convert this into kilojoules per gram, to compare it to the proper amounts we must divide it by 1000- 1768.42 = 1.77kJ/g 1000 We can then do the same for Digestive biscuits, by substituting it into the formula- 20 � 4.2 � 80.0 = 728.86 J/g 728.86 = 0.73kJ/g 9.22 1000 Then, we can also find the energy in the Crackers- 20 � 4.2 � 67.0 = 1815.48 J/g 1815.48 =1.82kJ/g 3.10 1000 Lastly, we do the same with EDO crackers- 20 � 4.2 � 82 = 1643.91 J/g ...read more.

Middle

The order of amount of total fat contained in each food, by the company kJ/100g- 1. EDO 30.00 2. Jack n' Jill potato chips 29.60 3. Digestive 21.10 4. Crackers 20.20 The order of total saturated fat in each food, shown by the company, kJ/100g- 1. EDO 17.00 2. Jack n' Jill potato chips 13.20 3. Digestive 10.90 4. Crackers 9.60 There are many nutritional reasons as to why EDO is the highest on the energy level list and Digestive biscuits are the lowest. Firstly, one should look at the fat content of each individual food. As you can see that the order of energy levels is identical to the order of amount of total fat, excluding the digestive and crackers. This is because fat is a good source of energy, therefore is can store more energy than any other food group such as carbohydrates or proteins. EDO has the highest fat content and therefore the highest energy level, this supports the fact that fat is a good source of energy. However, Crackers have a higher energy level than digestives, yet it has a lower fat content. ...read more.

Conclusion

Additionally, we were not consistent in the distance of the food from the tube. This would of resulted in an inaccurate, because it would of cause the water to heat up faster or slower. Besides, I should of stirred the water, before I recorded the temperature, because this would allow an equal distribution of heat across the whole mass of the water. Since I didn't stir the water, this would of caused the experiment to be inaccurate because I could of measured the temperature of a hotter or colder area of the water. Conclusion and Future improvements: In conclusion, I felt the experiment went well. I was able to complete the experiment in sufficient time and abiding to all the safety rules. However, to improve my experiment I will change numerous aspects of our experiment. Firstly, I will do more repeats, to allow me to calculate an average. Causing my experiment to be more accurate. Additionally, I will stir the water for an equal distribution of heat, to ensure accurate results. Furthermore, I would do the experiment in a heat sealed room, similar to the manufacturers. This would prevent heat loss, allowing my results to be more accurate and reliable. conclusion ...read more.

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Here's what a star student thought of this essay

4 star(s)

Response to the question

The response to the question is done reasonably well. The thing the answer mainly lacks is explanation as to why they did certain parts of the experiment in their analysis and deeper scientific reasons as to what their results meant. ...

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Response to the question

The response to the question is done reasonably well. The thing the answer mainly lacks is explanation as to why they did certain parts of the experiment in their analysis and deeper scientific reasons as to what their results meant. The conclusion and introduction could also be vastly improved upon.

Level of analysis

The table of results are clearly presented but the essay lacks an introduction and does not explain what they are trying to find out from the experiment and how they will do it. The calculations are accurately done but the candidate does not explain why they measured the fat content in each food. The candidate analyses the experiment well and what went wrong and how this could have affected the experiment but to increase their grade they could have made a more rounded conclusion about why the experiment went well.

Quality of writing

Spelling, grammar and punctuation are fine. The tables are set out well and the decimal places are accurate.


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Reviewed by skatealexia 04/07/2012

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