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To investigate the energy content of different foods.

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Introduction

Food for fuel Aim: To investigate the energy content of different foods. Introduction: We can show that food is a fuel by burning it, using this, we are going to investigate the energy content of four different foods; peanut, bread, pasta and a Brazil nut. Food is also a fuel in another sense. Plants and animals use food to get their energy. Different foods contain different types and amounts of energy. When food, and all other fuels (e.g. coal, oil, etc.), is burned, energy in the form of heat is transferred to it's surroundings warming them. The body's most basic need is for energy. To get energy it needs food as a fuel and oxygen to burn it. The amount of energy foods can produce is measured in units called calories. ...read more.

Middle

per gram Although both types of nut contain high levels of energy, they might contain less of other substances, like protein, for example. Which Bread and Pasta can provide more of. Diagram: Method: 1) Set up apparatus as shown in diagram 2) Weigh all of the foods 3) Make a note of the temperature of the water in the test tube. 4) Light the food (this may take some time with the pasta) with a bunsen burner. Remember to keep this flame away from the test tube. 5) Move the food directly under the test tube. 6) Wait until the food has completely gone out. 7) Record the temperature of the water in the test tube immediately after the food has gone out. Results: Food Experiment 1 Experiment 2 (Weight) Start Finish Start Finish (grams) Temperature (degrees Celsius) Pasta 23 40 18 57 (1.54) ...read more.

Conclusion

Evaluation: There are a number of things that could have affected the outcome of the experiment, they are as follows: a) There was a problem with getting the food samples to stay on the pin. During the time when I was replacing the food, some of the heat energy that would have been transferred into the water in the test tube would gone into the air, reducing the total amount of heat energy transferred into the Water. b) Some of the heat energy produced by the food went either through the pin, into the air or into the glass of the test tube. c) When lighting the food, some of the heat energy from the bunsen burner would have gone to heat up the water in the test tube. d) I could have inaccurately read the scale of the thermometer, although this wouldn't have mattered if I made the same inaccuracy all the time. ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This is a well written report that covers a lot of sections required.
1. The report is missing an equipment list, safety and variables section.
2. The data needs to be organized into a table.
3. The conclusion is very brief and does not use the data to back up the claim.
***

Marked by teacher Luke Smithen 23/07/2013

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