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

The aim of the experiment is to find how much energy is contained in a peanut.

Extracts from this document...

Introduction

Aim: The aim of the experiment is to find how much energy is contained in a peanut. Hypothesis: Peanuts are made up of mainly fat and protein. The human body need both protein and fat for survival. Proteins: Proteins form the main structure of the human body. We therefore need protein for growth and body building, and for repairing worn out or damaged tissues. Some proteins contribute to the structure of the cell, e.g. to the cell membranes, the mitochondria, ribosomes and chromosomes. These proteins are known as structural proteins. Protein contains carbon, hydrogen and oxygen, but it also contains nitrogen and sometimes sulphur too. A protein molecule is composed of lost of building blocks called amino acids and the links between them are called peptide links. About twenty amino acids exist in nature. The particular amino acids present, and the order in which they occur, very from one protein to another. In a complete protein molecule the amino acid chain is coiled, folded and cross-linked in various ways. Proteins can be split into their amino acids by adding water. This takes place in two steps: first the protein is broken down into shorter chains called polypeptides. Then the polypeptides are broken down into separate amino acid. ...read more.

Middle

I predict this because the peanuts with the higher mass have more chemical bonds thus, more energy will be contained within the bonds. The energy will be given off as the peanut is being burned. I predict that mass is directly proportional to energy released. Method: Apparatus: Bunsen burner, Wood Splints, Stand and Clamp, Boiling Tubes, Mounted Needles, Thermometer, Measuring Cylinder Randomly picked peanuts, Weighing balance. 1. Put 20 cm� of water into a boiling tube. Fix the tube in a clamp so that it is held at an angle of 45�. 2. Weigh a peanut very carefully, in grams using the chemical balance and record the result. 3. Fix the peanut onto a mounted needle, taking care that no bits drop off. 4. Measure the temperature of the water in the boiling tube and note the result. 5. Ignite the peanut in a Bunsen flame. Quickly place the burning peanut under the boiling tube. The idea is to use as much heat as possible from the burning nut to heat the water in the tube. If the nut goes out, relight it quickly and put it back under the tube, When the peanut has completely burnt. Measure the temperature of water in the boiling tube. ...read more.

Conclusion

A lot of the heat was being lost to the surroundings and thus did not heat up the boiling tube with all the water. One fact is that the person doing the experiment should be very attentive because his hand when holding the mounted needle that he jerks around and more heat can be lost. There should be a covering of some sort over the boiling tube and the mounted needle to prevent any heat loss. Aluminium foil would be ideal as heat is reflected back because of its shiny surface. Also a direct supply of oxygen should be provided so that the flame on the peanut is kept going. The peanut took a while to ignite and when you thought you had it lit it would go straight out again. You would have to relight the peanut several times so it can continue burning. The whole peanut would never completely burn as the flame would go out and it will be hard to ignite the peanut again. This will tell you that not all the bonds in the peanut were broken and the experiment is not complete as not all the energy is being released. To improve the experiment maybe a I could have used a more precise thermometer to measure the temperature more accurately, instead of rounding off to the nearest temperature. The water should have been measured more accurately maybe by using a graduated pipette. ...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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. The aim of this experiment is to answer the following question: What is the ...

    I will then measure the final titre and find the amount of solution used in neutralising the acid. 8. Take a sample again of the reaction mixture after two days and repeat the titration. 9. Take a third sample of the reaction mixture after three days and repeat the titration.

  2. How much Iron (II) in 100 grams of Spinach Oleracea?

    The colorimeter was calibrated using a black curvet and a curvet containing distilled water (aq) to establish a relationship between its reading and the concentration of the Iron (II) Ammonium Sulphate (aq) being observed. The solutions that I was required to make myself were made up into volumetric flasks as

  1. Antacid Experiment.

    I have to know the relative formula mass of the active ingredient, which was calcium carbonate, magnesium carbonate, or sodium bicarbonate. I also had to know the mass of the antacid tablet and the moles of the hydrochloric acid. Once I find out the relative formula mass of the active

  2. Investigate how the amount of heat produced by burning a fuel depends on the ...

    Final Temp. (?C) Change in Temp. (?C) 1.00 14.26 14.25 22.0 36.0 14.0 2.00 14.26 14.26 22.0 49.0 27.0 3.00 14.26 14.24 22.0 63.0 41.0 Having obtained these results, I plotted a graph to demonstrate them, with the mass of ethanol on the x-axis and the change in temperature on the y-axis.

  1. This experiment is to investigate how much energy alcohols give off when they are ...

    The variables for this experiment are: Material of Container: The beaker I keep the water in has to be the same as some materials are better conductors of heat than others. I will probably be using a copper container as it is easy to find and can withstand high temperature.

  2. The Biology and Diversity of Extant Reptiles.

    The have a shell covering their body, made out of a horny layer attached to a denser bony layer. It comes in two pieces, the carapace, for dorsal protection and the plastrom for ventral protection. 2 Excretion. Reptiles have modified their excretory products to conserve water.

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