• 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
  15. 15

Chemistry Course Work: Combustion of Alcohols

Extracts from this document...


CHEMISTRY COURSE WORK: COMBUESTION OF ALCOHOLS AIM: My main aim in this assignment is to investigate the combustion of at least five alcohols: Ethanol Propan-1-ol Butan-1-ol Pentan-1-ol Hexan-1-ol In this investigation we will also concentrate on how much energy is exerted when burning these alcohols we will also compare the Molar Heat of Combustion. Alcohols are also known as "A series of organic homologous compounds with a general formula 'Cn H2n + 1 OH' " Alcohols also burn in air where they react with Oxygen (O) to form the products of Water (H20) and Carbon Dioxide (Co2). "Cn H2n + 1OH + (n+n/2)-1O2 ? nH2O + nCO2" The reaction that takes place when alcohols are burnt is 'Exothermic' as heat is being given out; also the Reactant energy is higher than that of the Product. APPARATUS: Copper Can, (Calorimeter) Spirit Burner, Stand, Boss and Clamp with Wide Jaws, Measuring Cylinder (100 cm3), Thermometer (-100c to +1100c), Balance, Spirits: Ethanol, Propan-1-ol, Butan-1-ol, Pentan-1-ol, Hexan-1-ol, 100 cm3 of Water (H2O). Weighing scale (g) PLANNING: To actually help me make a proper plan and assessment of this investigation I will need to research mainly up on 'Combustion of Alcohols' and matters relating to it. The data obtained and collected shall hopefully help me make a sound and stable prediction; this can also assist me in making a simple, fair and safe test. Most of the aid will also come from the 'Preliminary Work' and 'Experiment' in which I will have the opportunity to get a better understanding of the aim in this experiment. The preliminary experiments that will be carried out will mainly involve us comparing two types of spirits being: Methylated Spirits, and Propanone. HYPOTHESIS: Alcohols differ from other organic compounds as their molecules are based on chains of Carbon atoms. Alcohol molecules contain 1 oxygen atom that is joined to a carbon atom; these two atoms are joined simply by a single bond. ...read more.


but I can reduce the amount of heat loss from the spirit burner by placing a hard board draught excluder around the experiment. During my Preliminary Work there were certain problems that I had come across such as 'Heat Loss', to avoid these problems again in the actual experiment I have taken certain measures, which hopefully will help me in obtaining sound and reliable data. As stated earlier in this experiment I will be using the following alcohols: Hexan-1-ol (C6H13OH) Pentan-1-ol (C5H11OH) Butan-1-ol (C4H9OH) Propan-1-ol (C3H7OH) Ethanol (C2H5OH) If I can at the end of my experiment after taking one set of readings for every alcohol, I shall try to take repeat readings for at least 1 alcohol if not for all. Whilst carrying out the Preliminary Work I did not time the experiment though this experiment will be timed, after a certain amount of time I shall stop taking readings for one type of alcohol and change to another thus I decided the time span at which I shall stop taking the readings for every range of alcohol will be 5 minutes. I will a APPARATUS Copper Can, (Calorimeter) Spirit Burner, Stand, Boss and Clamp with Wide Jaws, Measuring Cylinder (100 cm3), Thermometer (-100c to +1100c), Spirits: Ethanol, Propan-1-ol, Butan-1-ol, Pentan-1-ol, Hexan-1-ol, 100 cm3 of Water (H2O), Weighing scale (g), Stop Watch, Hard Board Draught Excluder, Bellow is a step-by-step procedure of what I did in the experiment: I firstly begun by collecting the required apparatus and setting it out for the experiment, I then measured 100 cm3 of water in the Measuring Cylinder from which I then poured into the Calorimeter, Then took the alcohol which I'd be using and weighed the initial mass in grams and took down the data, I also then took the initial temperature of the water and wrote down the result, Later I clamped the Calorimeter and made certain that the distance between the Wick of the Spirit Burner was 5 cm from the Calorimeter, I then ...read more.


but anomalous results still are produced. The procedure is suitiable to use. In my opinion it is possible to get good concrete results as I. I think that the way the pointer was placed is what may have cost my anomoulas result in places. A few changes can be made to make this expeiment to be more accurate and reliable and that is to use equipment to measure out the length of the wire rather then by hand.as our vision is not good enough to get the measurement 100% right also when the pointer is placed on the wire it could have jerked slightly away from the measurement without notice. My resuls in my opinion are anomonous or at least some even tough I did the experiment again I reproduced the same results but still the prefect sraight line waas not produced. I look at the results from scientific point of view: if you produce the same results twice that means the results are reliable. The results do support a firm conculsion and my prediction as the resistance increases when the length does and the fact a straight line is made and the line goes through the original means the length and resistance are poportional to each other. To make improvements to my experiment I would use newer equipment especially the voltmeter as It did tend to flicker to and fro numbers when trying to find the voltage. I could next time use a ohmmeter to produce the exact resistance I would find a mechanism to locate the measurement of the wire as the rulers used are not exact, and it is difficult to get an accurate reading of length by eye vision, as the wire might not be completely straight, it may be of different thicknesses throughout the length. I would also investigate other factors, such as temperature, voltage and current, and see how these effect the resistance. I would also do the experiments under different conditions such as temperature and pressure to see if it makes any difference to resistance. ...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

    Experiment to investigate the heat of combustion of alcohols.

    4 star(s)

    Each alcohol has certain bonds that need to be broken and require specific amounts of energy (joules) to do it: Bond type Energy Required (J) C - H 412 O = O 498 O - H 464 C = O 805 C - C 347 C - O 336 This

  2. Titration experiment - write up

    number of moles is equal to concentration multiplied by the volume (dm3.) N = C x V The concentration of the solution, Na2CO3, is known and the volume of the pipette (25cm3) is also known. Therefore, I can work out the number of moles of Na2CO3 in the conical flask

  1. The Combustion of Alcohols and the factors affecting these reactions

    The correlation coefficient (C on graph) measure the depth of the correlation of my results. The strength of the correlation depends how close it is to one. There are three graphs; 1. Predicted graph of results 2. graph of actual results 3.

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

    20�C 24�C Temperature at end. 75�C 79�C Temperature rise. 55�C 55�C Average rise, 55 + 55 = 55 2 Ethanol Actual heat combustion 1370 kj/mol Test one. Test two. Mass of burner at start. 274.82 246.83 Mass of burner at end. 246.83 245.53 Mass of alcohol used. 0.99 1.3 Average mass = 0.99 + 1.3 = 1.145 2 Temperature at start.

  1. To determine which alcohol, out of ethanol and propanol, is the better fuel. By ...

    Both weights were recorded. I set up the computer and the temperature probe and clamped the calorimeter with the clamp arm and placed the lid on it. After I placed the probe inside the lid and then recorded the starting temperature of the experiment.

  2. Investigating the Combustion of Alcohols

    Hence, combustion is an exothermic process. On burning, each alcohol molecule forms one more CO2 molecule and one more H2O molecule than the previous alcohol. CH3OH + 11/2 O2 --> CO2 + 2H2O C2H5OH + 3O2 --> 2CO2 + 3H2O C3H7OH + 41/2 O2 --> 3CO2 + 4H2O Therefore I

  1. Combustion of Alcohols

    46 Heat per mole = 42 = 420kJ 0.1 Test 2. Variable changed = volume of water in calorimeter * Initial weight of spirit burner = 192.59g * Volume of water in calorimeter = 150cm3 * Initial temperature of water = 22�C * Height of calorimeter above spirit burner =

  2. Determination of the heat of combustion of alcohols

    Weigh an aluminium can (a used Coke or 7-up can will do) empty. 5. Measure out 250 cm3 of water in the can. Take the temperature of the water. 6. Fill a bottle cap with methanol up to the rim of the cap.

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