• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9

Comparing fuels

Extracts from this document...


Comparing fuels Plan In this investigation I will be burning alcohols to heat up a test tube of water. I will be burning five alcohols, methanol, ethanol, propanol, butanol and pentanol. The aim is to find out how much energy is produced when burning these alcohols. Alcohols react with oxygen in the air to form water and carbon dioxide. When hydrocarbons are burnt they are oxidized, meaning carbon dioxide and water is made. The reaction that is involved in burning alcohols is exothermic because heat is given out. Form this reason the reactant energy is higher than that of the product. The energy is given out when forming the bonds between the new water and carbon dioxide molecules. The amount of energy made by exothermic reactions like this can be worked out by using the formula Heat J = temp rise ?C X Mass water g X 4.2 J/g?C. The bonds that are made in an exothermic reaction can be two types. It could be ionic, where a metal is produced. Ionic bonding involves electrons transferring from one atom to the other consequently leaving an electrostatic force between them. The other form of bonding is covalent where atoms share electrons to complete their outer orbit. ...read more.


So the longer the molecular structure in the alcohol the more energy it will take to remove the bonds. So I believe that pentanol will use more energy than methanol because it has more bonds to break. Bonds Analysis First of all I will calculate the amount of energy evolved. I will achieve this by using this simple formula... Energy evolved = temp rise ?C x mass water g x 4.2 j/g ?C Energy evolved = ............. x 20cm cubed x 4.2 Type of alcohol Energy evolved in (j) Energy evolved in (j) Methanol = 1 min = 134400. 2 min = 480480 Ethanol = 1 min = 144480. 2 min = 481488 Butanol = 1 min = 436800. 2min = 772800 To find out how much energy is produced per gram we use the formula... Energy per gram of fuel = Energy evolved x Mass of fuel burnt Energy per gram of fuel = ......... x ......... Below is a table showing how much energy is produced per gram when burning the alcohols in question... Type of alcohol Energy per gram Methanol = 1 min = 84672. 2 min = 4564560 Ethanol = 1 min = 621264. ...read more.


If the oxygen supply is very limited then you get some atoms of carbon released before they can bond with any oxygen atoms. This is soot. Since heat is given out when bonds form, less energy is given out by incomplete combustion. So this is why it affects the outcome of the experiment. To overcome this problem, I would have to make sure a sufficient supply of oxygen was involved in the reaction. BUTANOL: TIME 1 MINUTE Experiment 1 2 3 Amount of water 20cm 20cm 20cm Temperature of water before 20?C 20?C 20?C Temperature of water after 39?C 30?C 30?C Temperature of water rise 19?C 10?C 10?C Butanol weight before 126.78 126.15 125.60 Butanol weight after 126.15 125.60 124.91 Fuel loss 0.63 0.55 0.69 Test tube height 12cm 12cm 12cm BUTANOL: TIME 2 MINUTES Experiment 1 2 3 Amount of water 20cm 20cm 20cm Temperature of water before 20?C 20?C 20?C Temperature of water after 45?C 39?C 45?C Temperature of water rise 25?C 19?C 25?C Butanol weight before 124.88 122.83 120.91 Butanol weight after 123.54 121.33 119.46 Fuel loss 1.34 1.50 1.45 Test tube height 12cm 12cm 12cm AVERAGES: WATER TEMPERATURE RISE: (TIME 1 MINUTE) 13?C (TIME 2 MINUTES) 23?C FUEL LOSS: (TIME 1 MINUTE) 0.62 (TIME 2MINUTES) 1.43 ...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 Organic 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 Organic Chemistry essays

  1. Peer reviewed

    Burning Fuels Coursework

    4 star(s)

    results are reliable - to suggest that Butan-1-ol will be the most cost efficient fuel for Max Profit to use in his power station. Evaluation Throughout my study I have maintained a high level of accuracy - in the fairness of the experiments - to the consistency of the results,

  2. Hydrocarbons As Fuels.

    The biomass is dried and chipped before being converted to gas and bio-oil by heating in the absence of air. The gas or bio-oil is the used to fuel a gas turbine to generate electricity. Greater overall efficiency results when the biomass is first converted to gas and bio-oil.

  1. The Energy Content Of Different Fuels

    I will use these figures in my calculations to find out how much energy was produced by the fuel in kjmol-1. Dependant Variable: My dependant variables are measuring the temperature of the water before and after the experiment and the mass of the fuel before and after the experiment.

  2. "Could Sainsbury's add value to their business by using an alternative fuel for their ...

    Johnson, Revlon, Lever Brothers, Wal-Mart, Coca-Cola, Tom's of Maine, Campbell Soup, and Sears". However, Goldman, Hume and Schossberg, (1991) found that: "Consumer response to green marketing efforts has been generally unenthusiastic and has fallen short of marketers' expectations". P Yam Tang and Chan (1998)

  1. Find out the heat of combustion in the five fuels; Methanol, Ethanol, Propanol, Butanol, ...

    Full combustion will produce a blue flame. It should only generate two things; Water Vapour, Carbon Dioxide, I think the pentanol will be the most efficient and raise the temperature of the water the most, because it has got the more amount of intramolecular bonds( between the carbons and the hydrogen atoms)

  2. Energy Transfer in Fuels

    the top of the container so if it does conduct heat they will all conduct around the same amount. I will record these results in a table so if an apparent pattern occurs it will be considerably easier to see.

  1. Investigating Energy When Fuels Burn.

    = 464 O=O x 6 = 498.3 x 6 = 2991.6 (2) C=O x 4 = 805 x 8 = 6440 O = 11080 O-H x 8 = 464 x 10 = 4640 8571.6 - 11080 = -2508.4 Pentanol Pentanol + oxygen --> carbon dioxide + water C5H12O + 7.5O2 --> 5CO2 + 6H2O (1)

  2. GCSE Chemistry Revision Notes - everything!

    All electrolytes contain ions. Electricity passes in and out of the electrolytes via electrodes. In a metal or graphite, electricity is simply a flow of electrons. The movement of the electrons doesn?t produce any chemical change in the metal or graphite. Graphite and metal contain free-moving (delocalised)

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