• 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
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14

Burning fuels.

Extracts from this document...


Our aim is to find out which fuel out of the following 4 1. METHANOL - CH3OH 2. ETHANOL - C2H5OH 3. PROPANOL - C3H7OH 4. BUTANOL - C4H9OH Gives the most energy when it is burnt. 2. To find out if there is a correlation between energy and a certain number of carbons. Burning fuels is a combustion (oxidation) reaction: for example 2C H3OH + 302 2CO2 + 2H20 + ENERGY Reaction A chemical reaction takes place in two steps. STEP 1 The chemical bonds in the reactants are broken to release the atoms, which make the reactants. For this to happen we need to provide energy. One of the reactions that we must give it is called ENDOTHERMIC (Heat energy put in). H O H O H O H 2(H -C - O - H) + 3 (O=O) O H C H O H O H O H O H C The bonds that are broken are: C - H x 6= 413 x 6= 2478 C - O x 2= 335 x 2= 670 O - H x 2= 464 x 2= 928 O = O x 3= 498 x 3= 1494 5570 EACH CHEMICAL BOND HAS ITS OWN VALUE BOND ENERGY KJ/MOL H - H 436 C - H 413 C - C 347 C - O 335 O = O 498 O - H 464 C = O 740 STEP 2 O H O H O H O H C 2 C=O + 4 (H - O - H) ...read more.


fuel * Always 50cm3 of water * Same thickness of metal * Same colorimeter * Always 1gm of fuel * Start with coldwater each time Obtaining results Table Of Results Prediction For my prediction I have used lots of background knowledge and done some preliminary experiments. As you can see I have worked out the theoretical energy release for each alcohol and from these I would predict that as the number of carbon atoms go up so will the heat of combustion. I believe that the results will be proportional to the amount of carbon atoms. I believe this because every time you add an extra carbon bond you also add two more hydrogen bonds, which means that the relative molecular mass will increase as well. I also predict that this will be a constant amount. When I achieve my results I will need to figure out the actual amount of energy given out and the molecular mass plays a big part in this. Analysing I think my results tables and graphs clearly show the pattern that I have found in this experiment. That is that heat combustion does increase when the amount of carbon atoms increases. A table that answers the question more specifically and clearly is shown below: How many grams in one mole of each fuel? Fuel No. Of carbons Mass of 1 mole (g) ...read more.


As we proceeded with the experiment we came across two types of reactions: ENDOTHERMIC: A reaction that we must give it energy. This is when bonds break, and heat energy is put in. EXOTHERMIC: When new bonds are made energy is given out. We can prove this by using scientific knowledge because our scientific knowledge tells us that a chemical reaction takes place in two steps. The chemical bonds in the reactants are broken to release the atoms, which make the reactants. But for this to happen we need to provide energy. And the energies are as I said ENDOTHERMIC and EXOTHERMIC. We also found out that the prediction agrees with the conclusion because we predicted that the more carbon atoms a compound has the more energy it will release. Later on we investigated the experiment further and found out that Energy Joules/gm = 4.2 x 50 x temperature increase 4.2 is needed to increase the temperature of 1gm of water by 1C. Using this we found out that Butanol released 3255 Joules/gm. After this I can conclude that my initial prediction was actually right but I didn't allow for all of the experimental errors. I conclude that carbon atoms in alcohols do have an effect on the heat of combustion. As the amount of carbon atoms go up the heat of combustion does. This is because every time you add another carbon atom you are also adding 15 onto the relative atomic mass that plays a big part in calculating the end results. NAME:SUBHAN ALI 11-12-2003 SCIENCE COURSEWORK DR HOLMES ...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)

    4cm gap between the wick and the container and without a lid. The container was heated on a roaring blue flame for 30 seconds and the start and finish temperatures were measured. The thermometer was at first allowed to rest at the bottom of the beaker, but this would measure

  2. Titration experiment - write up

    Balances may also read to 2 decimal places i.e. they have readings every 0.01 g. This means a reading of 1.00 g is more than 0.995 g but less than 1.005 g. The percentage error in a reading of 1.00 g is 0.005/1.00 x 100 = 0.5%.4 Method Preparation of


    =458.93955178kj/mole 3rd attempt = 1860.418175?46 0.17?1000 =503.407271kj/mole Average = 351.54+458.94+503.41 3 ?437.54kj/mole Propan-1-ol: 1st attempt = 1602.3644?60 0.13?1000 =739.5528kj/mole 2nd attempt = 1636.987495?60 0.20?1000 =491.0962485kj/mole 3rd attempt = 1849.084405?60 0.14?1000 =792.464745kj/mole Average = 739.55+491.10+792.46 3 ? 674.37kj/mole Butan-1-ol: 1st attempt = 1771.12768?74 0.13?1000 =1008.180372kj/mole 2nd attempt = 1976.58664?74 0.21?1000 =696.51148267kj/mole

  2. Esters. Esters are formed from an alcohol and carboxylic acid; this is an ...

    are split into two groups, one group will use this shampoo and the other group will use another shampoo that doesn't use Pro-Keratin and Ceramide. They claim that those ingredients are the things that make hair look fully restored as 'Reinforcing: Enriched with Pro-Keratin, the conditioning formula reinforces each hair

  1. hydrogen peroxide experiment

    higher or lower amounts of each liquid than they were supposed to have, which could have affected the concentration of H2O2. * While the solid was being transported in the weighing boat MaO2 could have stuck to the tray meaning that <0.1g was transferred to the conical flask with side

  2. GSCE Coursework: Burning Fuels.

    Set variable: I will be changing the type of fuel used. Range of values: Methanol, Ethanol, Propanol, Butanol and Pentanol. Measured variable: The outcome I will be measuring is the mass of fuel burned in grams. Number of replicates: 3 times per fuel.

  1. &amp;quot;Could Sainsbury's add value to their business by using an alternative fuel for their ...

    5.2 Non-financial and financial benefits Natural gas is one of the cleanest alternative fuels available for HGV fleets, offering significant reductions in vehicle related pollutants (up to 99% in carbon monoxide, 75% in hydrocarbons and 86% in nitrous oxides). Natural Gas vehicles are also very secure.

  2. GCSE Chemistry Revision Notes - everything!

    Metal hydroxides lower in the Series are decomposed to an Oxide and water. Example equation: Copper hydroxide ? copper oxide + water Cu (OH)2 (s) ? CuO (s) + H2O (l) The Noble Gases The noble gases are all colourless gases.

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