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

To investigate how much energy (Kj) is stored in different types of peanuts and how much is released.

Extracts from this document...

Introduction

Title: to investigate how much energy (Kj) is stored in different types of peanuts and how much is released. Planning Background information: - The most common way to measure energy in a substance is to burn it. By using a relevant method and a formula, you can find out the amount of energy there is in peanuts. Heat produced by combustion of food (E) = m??t for the water in test tube. E represents energy, m is the mass of water which is determined from the volume. ? (theta) is the specified heat capacity of water, this is a standard value = 4.19J/g/�C, ?t stands for the change in the temperature of the water. So the amount of energy (E) in the heat gained by the water is given by the product of m�c�T. From my research, I found out that food factories use a b**b calorimeter which is very accurate and much easier to use. If a substance is burned in a calorimeter, its energy content can be determined. When food burns and heat is a known quantity of the water, the amount of heat given off by the food is theoretically equal to the amount of heat gained by the water. A calorie is the amount of thermal energy that raises the temperature of one gram of water by one degree Celsius. A joule is a little less than one-quarter of a calorie. Peanuts are grown in Georgia, Brazil, South America and Asia, these are very hot continent; therefore peanuts absorb a lot of the suns energy in photosynthesis. Peanuts are rich in oil and vitamin B. Oxidation or combustion is when a substance combines with oxygen to release energy and waste products, a good example of this would be respiration. Peanuts contain chemical potential energy which when released is very useful. According to research, peanuts are known to be a good source of protein and fat. ...read more.

Middle

7) Put a thermometer in water and record its temperature. 8) Hold a test tube using the clamp firmly and keep the thermometer to measure the temperature elevation. 9) Place a Bunsen burner on a heatproof mat and start the fire on the Bunsen burner, turn the flame to blue flame to get the optimum results. 10) Hold the peanut or pea using the cork handle directly on top of the Bunsen burner and heat a peanut or pea until it catches fire. 11) Make sure Bunsen burner is turned off. 12) Place the flaming peanut or pea directly under the test tube of water, as soon as this is done.... (keep the needle the same distance apart from the test tube). 13) Timer watch must be started 14) Record the temperature rise each ten seconds as accurately as possible for 90 seconds. 15) Repeat process for all the other peanuts or pea. Observation My experiment was based on the method above and I gathered all the necessary information to make sure that my results would be as precise as possible to the true figures when I compare them with existing products. I observed temperature change when the flamed peanuts were put directly under the test tube of water and thermometer. I measured the peanuts by using a weighing scale and I used a couple of peanuts each time to select the weight I desire. After all the peanuts were selected, I decided to draw tables to insert the results I will obtain. I felt that the units are really important to include because they would determine my final results after using the Energy formula. I set up all the equipment listed above correctly and safely. I decided to put the Bunsen burner off after each peanut was burnt, although it would be time consuming but I believe that the outcome would be more accurate. ...read more.

Conclusion

The quality of the accuracy would be much better if we did not take an average, albeit it will take longer but more exact results could be obtained. I think that this experiment was fair because I used the same measuring cylinder 25cm� for each test tube, the weighing scales were used accurately and were clear of any objects that could affect the results obtained, the Bunsen burner was put away from the practical to that it would not affect the results by adding heat to the surrounding environment. I can improve my accuracy by reading the time against temperature fasted and record it. By looking at the thermometer from a horizontal angle the results would be more accurate. The accuracy and quality can be improved by spending a longer time on the coursework. If I have the opportunity to repeat the experiment, with the experience I now have, I will try to use different apparatus such as the calorimeter to get a better result. I would add a different variety of foods next time such as cashew nuts and crisps, because I would like to find out how much energy there is in both of them, how many calories and which one contains more fat. If I can do this experiment again, then I would use the same method but a different technique to manipulate the equipment to gain the best results. I used a mounted needle to hold the peanuts and I had difficulty inserting the needle into the pea, and peanuts with out breaking them into pieces. Next time I could keep the remains of the burnt peanuts and subtract the final mass of the peanut from the initial mass to find out how much mass is burnt. Also, I could use different amounts of water to check if the energy stays the same or becomes different. Also, I could keep the needle the same distance(close) away from the test tube so energy will not be lost. To investigate even further, next time I plan to relate the speed of the reaction (how fast energy goes up compared with heat). ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Fighter Pilot A Statistical Analysis of Reaction time and its Correlation with Dominant ...

    5 star(s)

    The results of the preliminary work are below. Table 1 Data from preliminary work; ruler drop distances of ten subjects shown in centimetres Dominant Non-Dominant Test Results Drop Distance (cm) Test Results Drop Distance (cm) Subject Try Try Try Average Subject Try Try Try Average 1 2 3 1 2

  2. Marked by a teacher

    The Effectiveness of Different Solutions to Prevent or Treat Malaria

    4 star(s)

    This table displays some of the drugs that face drug resistance. Some of those have been reported so derivatives can be used instead. In addition in the table the fact that every drug has side effects shows that the treatment has to be controlled and any other information about something

  1. Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

    > Repeat this procedure with the other 39 samples. Risks and Hazards There are many risks and safety precautions in which I took. I had to make sure that I was dressed up warm, as it was quite cold. It did not rain heavily, however in case it was to rain I would be protected.

  2. Yeast Coursework

    I will also use 15cm3 of yeast and of sucrose, as this may make my results more reliable. I will also run the experiment for four minutes instead of five, as five minutes is too long to run them, and four minutes will most likely give just as reliable results.

  1. To determine the amount of energy in different foods and to find out how ...

    How will the experiment be a fair test? I will make the experiment a fair test by using the same amount of water in the boiling tube. This water will also be from the same tap. I will also make sure that the food is burning at the same distance from the boiling tube.

  2. Investigate the effect of bile salt concentration on the digestion of milk by the ...

    All of the improvements below are suggested in order to minimise procedural error and thus improve reliability of the results, and so improve the validity of the conclusion drawn from them. Procedural limitations Limitations of the method Rank order Impact of limitation on the data Suggested improvement Justification for the

  1. This experiment design by a group of general science to test different foods for ...

    * Absorb the colour change carefully; blue to violet indicates the present of protein. Safety assessment The nature of the experiment reflects into finding out protein from different food. The experiment involve small amount of sodium hydroxide and copper sulphate to identify the present of protein.

  2. Why the Body Needs Energy? Every living cell within the ...

    * The waste products are collected and the waste-rich blood flows into the veins in order to circulate back to the heart, where pulmonary circulation will allow the exchange of gases in the lungs to take place. * During systemic circulation the blood passes through the kidneys.

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