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

I have been given several different types of crisps and asked to carry out an experiment to find out which crisp releases the most energy when respired.

Extracts from this document...


Coursework Experiment


        I have been given several different types of crisps and asked to carry out an experiment to find out which crisp releases the most energy when respired.

       A balanced diet contains the six food groups Carbohydrates, Proteins, Lipids, Vitamins, Minerals, and Fibre. Out of these seven food groups three are classed as macronutrients and the other 3 micronutrients. In other words some you need a lot of to keep you healthy and some you need only a little. The micronutrients are Vitamins and Minerals, which are used to keep the body healthy, and Fibre that is used to help with excretion in humans and the others are macro, Carbohydrates are made of starch which will then be broken down by enzymes to make glucose for energy, Protein is used mainly for growth and repair but if necessary will be used for energy. Lastly Lipids are used for energy but unlike Carbohydrates that are fast releasing, Lipids are slow releasing. When predicting which type of crisp will release the most energy I will take into account the levels of all three of theses macronutrients in the different types of crisp.


        Using the data in the tables and the information from my note about how much energy 1g of each of the macronutrients releases when respired I predict that the Smiths salt ‘n’ Shake and Walkers Ready Salted crisps will both release the most energy.

...read more.



                I will keep the starting water temperature at 20 degrees Celsius by changing the water and test tube for each experiment and the starting volume of the water at 20cm3 because if it was less the water would just boil and evaporate so I will get no temperature change and if there is too much water it will take to long and the crisp would only heat the water a fraction. To do this I will always check the temperature is 20 degrees Celsius (room temperature) and I will use a measuring cylinder to measure 20ml of water for the boiling tube. Using a measuring cylinder is not a very accurate way of measuring the water instead using a glass pipette. I will also keep the distance between the crisp and the boiling tube 5cm because if I were to put it at a distance of 20cm for example most of the heat would be lost to the air and if it was 1-2cm the crisp would be smothered and the flame would go out due to lack of oxygen. Finally I will always light the crisp in the same way because doing it another way may cause the crisp to be away from the tube for a longer period of time cause more heat to be lost than in the previous experiment.


  1. Set up equipment as shown in diagram.
  2. Take crisp weigh on scales, record mass on table and place crisp in tin foil cup.
...read more.


        Looking at my table comparing my experimental and predicted results I can see that my experiment was not performed fairly at all and these results have shown me my experiment had many errors.

        As I have already said a lot of heat and energy was absorbed by the air, the clamp and the boiling tube. The soot on the boiling tube was part of the crisp so it takes some of the mass away without burning it, the soot can be burned in pure oxygen. Some of the crisps may have taken more energy to light. The smoke that came off of the crisps was hot and would of given energy but drifted off in to the air. There was also light energy given off but very little.

        All of these errors are eliminated when the energy of the crisps is measured in the factory by using a Bomb calorimeter.


The Bomb Calorimeter (pictured above) does not allow heat to be absorbed by the air, as it is all trapped inside and has a heatproof platform. The soot is burned because the crisp is burnt in pure oxygen, they time how long it takes to light the crisp and use a constant amount of energy so they know how much energy has been used. The smoke and heat is fed through a coiled pipe to heat the water around it and by the time it reaches the top it is cold so no heat is lost. They also use exactly 1g of crisp.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 Electricity and Magnetism essays

  1. Marked by a teacher

    Investigation into Energy Released From Burning Various Alcohols.

    4 star(s)

    I increased this to 40g, but the water was still too hot. I then further increased the mass to 80g. This value seemed reasonable, as the temperature only increased to 45�C. I then repeated the test using the same amount of water, but using Methanol, at the bottom of what

  2. "My aim is to find out how much energy is released when burning different ...

    Method I set up the apparatus like the diagram beneath. We got 3 samples of 1 type of crisp to start with and recorded the weight of the first crisp, then put 20cm of water in the test tube and recorded the temperature.

  1. To find out what happens to the efficiency of a motor as I change ...

    By looking at the graph it is possible to determine a clear trend, to find the optimum weight for the motor's efficiency, and to spot any anomalous results. What I have found out By looking at the graph you can see that the line of best fit shows a clear

  2. How does the Relative Molecular Mass change in heat combustion of an alcohol?

    This simply makes all the values positive. The energy 'change' will always be negative as it is subtracting the energy in the reactants from the energy in the products. As energy is being given off the energy left in the products will always be less than the reactants started with.

  1. Design an experiment to predict and test the output from a simple AC generator.

    As we are working for one complete turn the time taken for one complete turn is the time period T. T is also calculated by the formula T=1/f Where T is the time period which is the time for one complete turn and f is the frequency which is the amount of complete turns in one second.

  2. Choosing a light source

    This happens because the electron from the cathode hits the electrons in the mercury vapour bond and which brakes the bond and in doing so, it releases a photon of energy. This photon is the visible light that is produced when a light bulb is turned on.

  1. Experiment to investigate the energy given of in food stuffs.

    HYPOTHESIS: I think that the roasted peanut will contain the most energy because it contains the most fat (fat per 50g plain peanut: 23.0g, dry roasted peanuts: 22.5g and roasted peanuts 23.5g). So the roasted peanut will burn for longer and will heat the water to a highest temperature due to the high fat content.

  2. Investigating The Heat Of Combustion Of Alcohols.

    Once we have measured the decrease in mass, we can use this to work out how many moles were used to make a specific temperature change. This can then be used to work out how much energy is given off by each mole of that specific alcohol.

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