• 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

Investigation to compare the energy given out when alcohol's burn

Extracts from this document...


Charlie Cowley Planning an investigation 30/09/02 Investigation to compare the energy given out when alcohol's burn I am investigating how different types of alcohol's effect the amount of energy given off. The types of alcohol used will be; Alcohol Formulae * Methanol CH3 OH * Ethanol C2 H5 OH * Propanol C3 H7 OH * Butanol C4 H9 OH I am going to investigate the amount of energy given out by the creating of bonds by subtracting the amount of energy needed to break the bonds to the amount given out from the creating of bonds. Methanol; C H3 OH + O2 ? CO2 + 2H2O H ? H - C - O -H ? H C - H O - H O = C = O O = O H - H ( 412 ) ( 463 ) ( 743 x 2 ) ( 496 x 1.5 ) ( 463 ) Input : ( 3 x 412 ) + ( 463 ) + ( 360 ) + ( 496 x 1.5 ) = 2803 Output : ( 743 x 2 ) + ( 643 x 4 ) = 3338 Energy out 3338 - 2803 = 535 = 535 kJ Ethanol C2 H5 OH + 2O2 ? ...read more.


being lost and this will help the distance between the burner and calorimeter stay the same, convection will remain the same and heat loss into the calorimeter How will I get my Results To get my results I am going to light the burner and heat water in a copper calorimeter. I will be heating the water 10?, making sure of this by using a thermometer. I will then measure the amount of alcohol burnt using a balance straight before and after to get the most accurate results I can. Obtaining the evidence I used the following apparatus: Chemicals: * Methanol, * Ethanol, * Propanol, * Butanol, Apparatus: * Copper calorimeter * Fuel burners * Fuel burner lids * Thermometer * Balance * Clamp stand * Measuring cylinder This is how I did the experiment: I measured the temperature change (which was from a certain temperature to another certain temperature), and the amount of alcohol burnt off (by measuring the weight of the burner before and after and measure the different.), and the amount of water. I measured the temperature with a thermometer, the mass change with a balance and the water with a measuring cylinder. To make shore my results are reliable repeated the experiment a three times, compared it to my predicted results and looked at other people's results and compared them. ...read more.


This method could have been improved but not using classroom methods. To make the results as accurate as possible it would have been necessary to use a thermometer that measures to a degree of accuracy within 0.5(, and I would have to stop heating the water exactly on 30( so the change in water temp would have been the same. The results I obtained did make sense but they weren't as accurate as I would have liked, they were accurate enough to obtain and support a firm conclusion apart from the predictions do not make much sense as to being so far off the actual results. In experiment 1 there were unexpected results that made the results slightly inaccurate ethanol burnt using more energy than methanol. This was resulting in an unfair test, as the flame sizes were different and there was no protection against convection and draught. The only limitations were that it was impossible to do the experiment in great detail. To support my conclusion I have the evidence of the bond energies and knowledge of the fact that there are more bonds to break in butanol. To further support my conclusion I could have experimented with different alcohols. ...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. Marked by a teacher

    What an ester is, how it is made, examples of esters, animal testing issues ...

    4 star(s)

    I ask 5 females and 5 males so that the results can be more valid, as women may use cosmetics more than men and need them more. The first questionnaire question 'Are cosmetics essential in your daily life?' 8 of 10 people answered yes and 2 people weren't sure.

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

    To make this test more reliable I think I should of repeated the test to make sure the product in the beaker smelt the same and to also make sure that I didn't make a mistake during the experiment. Emollients are substances that soften and soothe the skin.

  1. Investigate the enthalpy change of different alcohol

    fuel, because they are more stable so they gives out more energy. Butan-1-ol has the OH group attached to C1, and butan-2-ol has the OH group attached to C2, in addition, butan-1-ol gives out 600J more energy per mole, the trend would be the further the carbon the functional group is attached to, the less energy it gives out.

  2. Comparing Energy Given When Different Alcohols Burn.

    Pilot Apparatus * Calorimeter * Boss * Clamp and Stand * 100cm3 measuring cylinder * Thermometer * Heating mat * Mini Beaker * Rocksil Wool * 3 Different Alcohols * Ruler * Top Pan Balance Pilot Method * Collect equipment * Measure 100cm3 of water and put in calorimeter.

  1. The Energy Content Of Different Fuels

    of moles of fuel used Energy produced per mole = 7560 / 0.03340909 = 226285.7143/ 1000 = 226.286 kjmol-1 1st Pentanol: 1. Temperature rise= (89-19)= 70?C 2. Mass of fuel used = (225-223.6) = 1.4g 3. Molar mass of C5H11OH = 88 No. of moles = mass Molar mass No.

  2. The aim of this investigation is to compare the enthalpy of the following different ...

    for ethanol C2H5OH + 3O2 2CO2 + 3H2O Ethanol + Oxygen Carbon dioxide + Water (l) + (g) (g) (l) Structural Formula: H H H - C - C - O - H + O = O C + O H H O O H H Bond Broken Bond Formed 2(C - C)

  1. hydrogen peroxide experiment

    brushed of throughout the laboratory, hydrogen peroxide will be handled using measuring cylinders and if necessary a pipette due to the fact that hydrogen peroxide is a bleach and also corrosive and can damage skin and eyes. * Burettes will be handled carefully so as to avoid them shattering, causing possible injury in doing so.

  2. GCSE Chemistry Revision Notes - everything!

    It is best to use nitric acid, as all nitrates are soluble. CO32- (s) + 2H+ (aq) ? CO2 (g) + H2O (l) Sulphites Sulphites contain the ion SO32- and so have similar formulae to carbonates. Sulphites react with dilute acids to give off SO2. SO32- (s) + 2H+ (aq)

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