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

This project was set out to test the strength of different carbon chains in combustion

Extracts from this document...

Introduction

Chemistry coursework This project was set out to test the strength of different carbon chains in combustion Alcohol is an organic molecule with an OH group. These bonds are hydrocarbon bonds which are made up of hydrogen and carbon. My scientific knowledge tells me that as the hydrocarbon molecule increase, ie there are more bonds then: 1) the boiling point increases 2) it gets less flammable 3) it gets more viscous 4) it gets less volatile I set up a preliminary test using Methanol which has the shortest carbon bond, which is single, to find the suitable variables and constants. The experiment was set up as follows: Apparatus: Bunsen burner 5 Alcohols Metal water container Heat mat Thermometer Weighing scales Tort stand I did 3 preliminary tests using different variables to find the appropriate and most efficient. Experiment 1) 50ml of water 10cm away from the flame with a 20 degree increase in temperature Experiment 2) 100ml of water 20cm away from the flame with a 20 degree increase in temperature Experiment 3) 50ml of water 10cm away from the flame with a 40 degree increase in temperature For each experiment I filled a beaker of water with the amount specified. ...read more.

Middle

Method: I am going to take a flask of alcohol and measure its mass. Once recorded I am going to use the same procedure as in my preliminary. The beaker with 50ml of water will be held by a tort stand 10cm above the floor. The thermometer is placed in the water and the initial temperature is recorded. The alcohol is placed under the beaker and lit. It is left there until the temperature of the water has changed 40 degrees. The flame is then put out and the final mass of the alcohol is measured. This experiment is repeated 3 times with 5 different alcohols. I think that this is a relatively fair experiment. I decided to cover the experiment with books so that the wind or a gentle breeze would not affect the flame, disrupting the experiment. I also made sure that the beaker was attached to the tort stand in the same place so that the distance between the flame and the water was the same. I used the same beaker but cleaned it before each experiment. I used the same type of water (distilled) and all initial temperatures were relatively close. ...read more.

Conclusion

This lowered the accuracy of the average, thus lowering the accuracy of the calculations. The apparatus was vary simple using a tort stand and a ruler to judge the distance for the height of the beaker. Because of the time limit I could only have a small amount of water and a small temperature change. This could have severely altered my results as the combustion may not have completed. The alcohol was very limited, each had been used before. The flames were different sizes due to different size wicks in the alcohol. I made an effort to protect the flame but in some cases the flame had to be re-lit due to a draught in the classroom. The only anomalie was using Pentanol. This was the longest carbon chain. I think this was the least accurate as combustion was not completed. This however did not affect my experiment greatly as I could still identify a strong positive correlation in my results, thus leaving my results reliable enough to come to my conclusion. If I were to do the experiment again the main aspect needed to be improved would be the time period. If I had longer to do the experiment I could use a greater range of experiments thus making my average more accurate. Christian Wimshurst UVD ...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. Free essay

    First aid project - treating common injuries in the laboratory.

    4 star(s)

    Fax: 020 7562 2000 Minicom: 020 7562 2050 General enquiries General enquiries about the work of the British Red Cross should be sent to information@redcross.org.uk, call 0844 412 2804 or write to Information Resources at the address above. Aid-Training Aid Training & Operations Ltd, Crusader House, Centurion Way, Crusader Business

  2. An investigation to find out the effect of carbon chains on the boiling point ...

    Isomers are molecules that have the same molecular formula, but have a different arrangement of the atoms in space. There are two types of organic compounds used in this experiment: alkanes and alcohols. Alkanes contain only carbon and hydrogen atoms and all C-C and C-H bonds are single bonds (intermolecular forces).

  1. hydrogen peroxide experiment

    Seeing as the However the variation of each concentration is below 50% of the average reaction time the evidence is accurate as There was only one result that was classed as an anomaly however the points in the 'Chart Showing How the Rate of Reaction of the Decomposition of Hydrogen

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

    The reason for this is, as the alcohol molecule does not form a straight chain in propan-2-ol as it does in propan-1-ol, the molecules cannot be so close to each other. This is mainly due to the position of the OH (alcohol)

  1. How Does The Increase In The Length Of The Carbon Chain Affect The Energy ...

    A range of heights was tested between the flame and the calorimeter but 5cm was decided to be most suitable. A range of rise in temperature was also tested to see what amount gave the best range of results. A rise of 30�C was tested to be most suitable, giving a good range of results.

  2. 'Enthalpy of Combustion'.

    Bond Energy/ kJ/mole No. of Bonds Energy/ kJ/mole C-C 347 0 0 C-H 413 0 0 Product C-O 358 0 0 H-O 464 8 3712 C=O 805 6 4830 O=O 498 0 0 TOTAL / kJ 8542 Theoretical Heat of Combustion = 8542 - 6648 = 1894 kJ/mole Butan-1-ol (C4H9OH)

  1. Which Alcohol is the best fuel?

    This energy level diagram helps to show how the heat is released in an exothermic reaction. Energy level diagram - an exothermic reaction. Here the products have less energy than the reactants, so the energy left over is given out as heat and heats up the surroundings and so heating up the water in the tin.

  2. GCSE Chemistry Revision Notes - everything!

    The incoming electron is further and further away from the nucleus as you go down the Group, and so it is les strongly attracted. This means an ion is less easily formed. It also means that it is easier to remove the extra electron from bromide ion than chloride ions.

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