• 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)

    This method was superior to the other, with only two anomalies (highlighted in red.) The anomalous results were then retested. The results we gathered were all within a 5% error margin. Black Copper Aluminum Aluminum Starting Mass (g) 141.06 138.81 136.25 140.41 138.17 136.86 139.21 137.52 135.43 Final Mass (g)

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

    This statement turned out to be true. As you can see from my graph, Pentanol had the highest amount of heat produced, and this also had the highest number of chemical bonds. This is just as I had said in my prediction.

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

    Non-toxic gas, but contributes to climate change. Carbon Monoxide (CO) Results from incomplete combustion of fuel. CO reduces the ability of blood to carry oxygen and can cause headaches, respiratory problems and, at high concentrations, even death. Oxides of Nitrogen (NOx) Produced in any combustion process, NOx emissions are oxidised in the atmosphere and contribute to acid rain.

  2. Energy Transfer in Fuels

    The reason I thought of this prediction is because there is the conservational issue of "The Green House Effect". This is due to carbon dioxide atoms in the atmosphere keeping in heat rather than naturally letting it radiate out back to space.

  1. Investigate the different amounts of energy given off when different alcohols are combusted. I ...

    As Pentanol has the most bonds it is elementary to say that Pentanol needs more energy to break its bonds and more enery is given out when new bonds are made. It has the largest enthalpy as it gives off the most energy per mole, and methanol gives off the smallest amount of energy- therefore it has the smallest enthalpy.

  2. This is a mini-project on fuel - topics include petrol and fossil fuels.

    These are things you might fin on a four- stroke engine: * Piston 4 rises and pushes waste gases out through exhaust valve. * Piston 3: mixture explodes, and expanding gases push piston down. * Piston 2 rises and compresses (squeezes)

  1. The Energy Content Of Different Fuels

    + (1 x 463) + (6 x 498) = 3717 + 1041 + 360 + 463 + 2988 = 8569 kjmol-1 On the right-hand side of the equation: 4 x ?2 x C=O (-743 kjmol-1) 5 x ?2 x O-H (-463 kjmol-1) Total energy produced by making bonds: (8 x -743)

  2. GCSE Chemistry Revision Notes - everything!

    It is then dipped into the acid once more and then a tiny sample of the solid is put into the flame. If the flame is lilac, the metal is Potassium If the flame is blue-green, the metal is Copper If the flame is red, the metal is Lithium If

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