• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

All foods except vitamins and minerals contain stored energy. This energy is released and made available to living things during the chemical reactions of respiration.

Extracts from this document...

Introduction

Food Energy Background: All foods except vitamins and minerals contain stored energy. This energy is released and made available to living things during the chemical reactions of respiration. When food is burned it releases the same amount of energy in the form of heat, as it does when respired. The energy value of food is burned in a calorimeter. All the heat given off by the food is transferred to a known quantity of water, which rises in temperature. It takes 4.2 joules of heat to raise the temperature of 1g of water by 1oc. So the energy value of food is calculated by the formula; temperature rise x 4.2 x mass of water. A foods energy value is usually quoted in kilojoules: 1 kilojoule (1kj) = 1000 joules. These measurements give the potential rather than the actual energy value of a food. If you eat bread and butter, whose energy value is 1000kj, you do not get 1000kj of energy. ...read more.

Middle

potatoes fried in fat give three times more energy as potatoes boiled in water. A food calorimeter is used to find out how much energy there is in a sample of food: Prediction I think that the more energy a food contains then the more hotter the water will be. The food containing more fats will increase the temperature the most because... More fats>more energy>rise in temperature Plan To investigate how much energy a food sample contains I will need... Bowling tube Tongs Water Crushed food - crisps, cereal, rice, biscuit, noodles, bread Bottle top Thermometer Bunsen burner Pestle and mortar For the whole of the experiment I shall be wearing goggles. Firstly I am going to fill a boiling tube with 1/3 of water and then I am going to clamp it (see diagram). Then I shall record the temperature of the water. Then I am going to crush the food that I shall be using with a pestle and mortar and then place the food in a bottle top. ...read more.

Conclusion

I am not surprised that the noodles contained the least amount of energy, as the noodles don't have much fat. Order of energy given out: Most Crisps Cereal Bread Biscuit Rice Least Noodle Evaluation I think that the experiment was unreliable. The results were not very accurate due to the not so accurate amount of water and the foods, we could of weighed and made sure that we used the same amount of food for each one. Also we should of left the water to cool down between each food for the same amount of time. Instead of using a 1/3 of the boiling tubes amount in water we could of used 20ml of water. There were also difficulties in keeping the Bunsen burner alight and also keeping the food alight long enough to have an effect in the temperature of the water. Also to ensure the Bunsen stays alight and isn't affected by wind, e.g. place a shield around the Bunsen. Rajvir Nijjar 18083 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Food Technology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Food Technology essays

  1. Marked by a teacher

    The Importance of Vitamins and Minerals In the Human Body.

    4 star(s)

    http://www.indstate.edu/thcme/mwking/vitamins.html#biotin Biotin is synthesized by intestinal bacteria and as such deficiencies are rare. Deficiencies are generally seen only after long antibiotic therapies which deplete the intestinal fauna or following excessive consumption of raw eggs. "Symptoms of overt biotin deficiency include hair loss and a scaly red rash around the eyes, nose, mouth, and genital area.

  2. An Investigation to find which foods have the most energy content

    Our result was anomalous because the biscuit suddenly caught light and would not stop burning but the other two oat biscuits didn't light very well so we got very different results e.g. for the anomalous result we got 5387.828162 J but the lowest result for the oat biscuit we got

  1. Free essay

    An Investigation into Convenience Foods

    is a prepackaged, frozen meal which usually comes packaged in a flat cardboard box. They require very little preparation, and contain all the elements of the meal in one package. An example might be a chicken tikka masala meal, where the rice, chicken, and all other ingredients are prepackaged in a plastic tray.

  2. heal and social unit 2

    After measuring my person's peak flow, weight and height I got these results. His peak flow is: 479 His weight is: 70.56 kg His height is: 1.58 m These results tell me that his body mass index equals: Persons weight in kg divided by the square of their height in metres 70.56 K.G.

  1. acrylamide in crisps and chips

    The Food Standards Agency said consumers do not need to change their diet in the light of this report. The WHO said the study results were worrying, but that more research was needed. Jorgen Schlundt, head of the WHO's food safety programme, said: "I am not saying that the world should simply stop eating these foods."

  2. Nutrients are split into two main groups, the macronutrients which contains carbohydrates, fats and ...

    Fat is very important in the formation of cell membranes nerve tissue. It provides a reserve of energy and helps to insulate the body against extreme temperatures. Stored fat also helps to cushion impact by protecting internal organs against shock.

  1. Investigate the range of cookie style biscuits available in a local supermarket

    But some people commented that they preferred "Maryland" and "Millie's" cookies to other brands. Chocolate Chip Cookie Recipe 115g butter or margarine 50g caster sugar 50g soft brown sugar 1-2tbsps golden syrup 1 egg 1/2 tsp vanilla essence 175g self raising flour 75g milk chocolate chips 75g white chocolate chips

  2. Globalisation and regulation of food risks. A theoretical overview.

    Nevertheless, political change is needed to force economic actors to integrate environmental concerns in their operations, in the economic sphere itself (producer - consumer relations) and in civil society, creating forms of environmental sub-politics beyond formal compliance with existing legal obligations.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work