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

Planning - The aim of the experiment is to work out the enthalpy change of combustion of a fuel.

Extracts from this document...

Introduction

THE TASK The aim of the experiment is to work out the enthalpy change of combustion of a fuel. BACKGROUND INFORMATION In an exothermic reaction, energy is given out to the surroundings, usually in the form of heat and is usually shown by a rise in temperature. In an endothermic reaction, energy is taken in from the surroundings, usually in the form of heat and is usually shown by a fall in temperature. During a chemical reaction, old bonds are broken and new bonds are formed. Energy must be supplied to break existing bonds. Therefore, bond breaking is an endothermic process. Energy is released when new bonds are formed. Therefore, bond formation is an exothermic process. This shows an exothermic reaction because the products are at a lower energy than the reactants The difference in height represents the energy given out in the reaction. ...read more.

Middle

A hydroxyl group: They have the general formula: CnH2n+1OH The structures of the 5 alcohols I will be experimenting with: Methanol: Ethanol: Propanol: Butanol: Pentanol: SECONDARY SOURCES Chemistry for GCSE - E.N. Ramsden CGP Chemistry Revision Guide - Richard Parsons Class notes http://www.bbc.co.uk/education/gcsebitesize/ http://www.revise.it/ PRELIMINARY WORK The loss in mass of methane was measured, after heating 50cm� of water until it went up by 20�C. It was found that the temperature rises by 20�C very quickly, meaning that the results would be less accurate as there is a smaller degree of error. Therefore I decided to measure a temperature rise of 30�C instead. I thought that using 50cm� of water would be fine. EXPERIMENTAL PREDICTION I predict that the more bonds there are holding the carbon, oxygen and hydrogen atoms together; more energy will be required to break them apart. ...read more.

Conclusion

Then, the spirit burner was placed 15cm under the copper beaker. The thermometer was then inspected until the temperature of the water had risen exactly 30�C above the starting temperature. The spirit burner was then weighed, and the change in mass was noted down. Accuracy: * Make sure you read the thermometer at eye level. * Make sure that the size of the wick is roughly the same size in each experiment. Safety: * Make sure that the wick of the spirit burner does not fall into the alcohol while it is on fire, as it will cause an explosion. * Make sure that you wash your hands if you come into contact with any of the alcohols, as most of them are toxic. * Make sure that the thermometer and the copper tin is firmly clasped into the clamp-stand, as it could cause damage to the thermometer, or injury to you if one of them falls off. ...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. Titration experiment - write up

    After letting the pipette run its containing solution into the conical flask, touch the tip of it on o the side of the conical flask so that the last drop is accounted for. 12) Remove the funnel after filling up the burette.

  2. THE LINK BETWEEN CARBON ATOMS IN A FUEL AND THE ENERGY IT RELEASES.

    are no reactions if the rate of the chemical reaction is not changed. The graph is a linear graph because the number of carbon atoms is directly proportional to the energy released. Subsequently the bar chart also revealed just as much.

  1. Comparing the enthalpy changes of combustion of different alcohols.

    1.45g 1.43g 1.44g Starting temperature of water (�C) 22�C 23�C 24�C Final temperature of water (�C) 37�C 38�C 39�C Methanol Replicate four Weight of spirit burner before (g) 236.98g Weight of spirit burner after (g) 235.23g Change in mass of spirit burner (g) 1.75g Starting temperature of water (�C)

  2. Investigate the enthalpy change of different alcohol

    Change in weight of the spirit burner (g) Energy transferred (J) 1st trial 15.6 -0.75 13010.4 2nd trail 16 -0.74 13344 3rd trial 17.5 -1.06 14595 4th trial 12 -0.52 10008 5th trial 13 -0.41 10842 Average 14.82 -0.696 12359.88 E.g.

  1. "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)

  2. Molar Heat of Combustion of Alcohols

    Energy is radiated from the apparatus and beaker, the beaker could have been covered with insulation around the sides and tin foil to cover the top but most of the heat would still have escaped. It is possible that energy was transferred to the apparatus via conduction but this would

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

    Such fuel is the only source of energy for cooking and heating for some 2000 million people. In many developing countries, the wood used as fuel comes mainly from unmanaged forestry, in which trees are felled but not replanted. There are developments under way, however, that will make both the production and the combustion of biomass more efficient.

  2. GCSE Chemistry Revision Notes - everything!

    Both ions formed have stable electron arrangements. Strong electrostatic forces hold the ions together. Although sodium is a dangerously reactive metal and chlorine is a very poisonous, reactive gas, sodium chloride is safe to eat. A positive ion is called a cation and a negative ion is called an anion.

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