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

Investigation on Energy released from Combustion of Alcohols.

Extracts from this document...

Introduction

Investigation on Energy released from Combustion of Alcohols Our experiment was designed to investigate which alcohol released the most energy when burned. Our plan was to measure the mass of the alcohol combusted when heating a specific volume of water to a specific temperature. We conducted this experiment on 5 different alcohols: Methanol, Ethanol, Propanol, Butanol and Pentanol. This was repeated 3 times for a better spread of results. These are our results. This table shows the mass of alcohol used to heat 20ml of water from 23o C (Room temp.) to 60o C. Pentanol lost the least mass when heating the water. When an alcohol burns it reacts with Oxygen to produce CO2 and Water. ...read more.

Middle

This is because the products give out more energy than the reactants took in. The overall heat change shows the kJ of energy produced form burning one mole of the alcohol. As the size of the alcohol molecule increases, the energy released also increases. I predict that Hexanol would give out even more energy than Pentanol. Hexanol + Oxygen Carbon Dioxide + Water C6H13OH + 9 O2 6 CO2 + 7 H2O This table displays the hypothetical details of the combustion of Hexanol. My prediction was correct. As the size of the molecule increases, the energy produced also increases. This table shows exactly how many kJ of energy were produced during the experiment. When we lit the spirit burner, we supplied the energy to start breaking bonds. ...read more.

Conclusion

Heat is given out resulting in a decrease of energy in the reactants. E- Reaction stops because the flame is blown out. Products at constant temperature. There are some factors that may have made our results less accurate. Firstly, we didn't always make sure that the test tube of water was the same distance from the flame. Secondly, we didn't always check that the water was at the same temperature every time we conducted the experiment. These factors could have amounted to a poor set of results. If I repeated the experiment, I would make sure that there was plenty of oxygen under the sheet of aluminium foil because at one stage of the experiment there was some incomplete combustion. There wasn't enough oxygen to make the carbon dioxide, resulting in carbon soot forming on the test tube. I would also test substances, other than 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 AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    Larger limpets have a lower surface area : body volume ratio thereby reducing the rate of water loss. Species living at the bottom of the shore (sublittoral zone) such as the Patella aspera haven't adapted in this manner, as

  2. Marked by a teacher

    To make sure we have plenty of energy in the future, it's up to ...

    4 star(s)

    When a boat lifts a sail, it is using wind energy to push it through the water. This is one form of work. Farmers have been using wind energy for many years to pump water from wells using windmills like the one on the right.

  1. Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

    certain organism, which will affect the amount of dandelions, which are present. The season, as I implemented my investigation in September, the light intensity has decreased, which may have effected how the dandelion photosynthesis. All these factors will be considered when I write my conclusion.

  2. Why the Body Needs Energy? Every living cell within the ...

    cells within the body because the oxygen is getting to the cells. Reference: http://www.ivy-rose.co.uk/Topics/Respiratory_System.htm http://www.brianmac.co.uk/physiolr.htm Website viewed on 20/5/08 The Gross Structure of the Repertory System The nose is an organ on the face which acts as the first passageway for the air to entre the body The Structure of

  1. Bats investigation

    the sides of the warehouse, even creating an entire cave for the bats to roost should they want to. Shallow blue-white light illuminates the area, making it seem like moonlight (important for the two Pteropus), and when I first entered, I had to stand still for a while just taking all the sights in.

  2. Comparing Physical Fitness Between Male and Female-Implementing the Investigation

    Slowly release the tap on the burette, while stirring the conical flask at the same time. Close the tap on the burette as soon as the solution turns blue. 13. Record the reading on the burette amount 14. Repeat this titration thrice for each participant Risk assessment For the methods

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    If it is too small, the sample would be all collected from the same area. A frame quadrat is chosen rather than a mest net because of the dip and broad surface on the shore which makes is not a flat area.

  2. Investigate the factors that affect the energy released during reactions between metals and acids.

    I have done this, as I believe it will be a more fare experiment, and a lot easier to test than the other two factors that I mentioned. To test the concentration of the acid I would need a different concentration for every reading.

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