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

An investigation into the heat output of some alcohol

Extracts from this document...


An investigation into the heat output of some alcohol Problem To design a fair experiment to find out which of the three alcohol gives the most heat output. We have methanol, Ethanol and propane. Hypothesis I think Propanol would give the most heat output, because it has more carbon and hydrogen than other two alcohols. Apparatus * Small beaker containing 20 cm3 * Weight scale, to weight each alcohol * Thermometer, to measure the temperature of water every 30 seconds * Stand, to hold the beaker above the alcohol * Use the timer to measure the time taken for each alcohol to boil Safety * Wear goggles at all time during experiment * If there were any spillage, wipe it off with a paper towel. ...read more.


�c 49 �c 42 �c 3rd 30 sec 56 �c 60 �c 56 �c 4th 30 sec 65 �c 70 �c 64 �c 5th 30 sec 74 �c 82 �c 75 �c 6th 30 sec 82 �c 100 �c 85 �c 7th 30 sec 90 �c 94 �c 8th 30 sec 97 �c Boiling at 100 �c 4.25 minutes 3.59 minutes 2.55 minutes Weight of alcohol before use 159 grams 176 grams 182 grams Weight of alcohol after use 158 grams 174 grams 178 grams How much alcohol used 1grams 2 gram 4 grams Conclusion According to my results Propanol gives the most heat output as it boils the water in just 2.55 minutes. Ethanol boils the water in 3.59 minutes and Methanol boils the water in 4.25 minutes, Methanol is more than 1.5 slower than Propanol. ...read more.


Propanol burns at a faster rate. Evaluation I think my experiment was fair because I used a measure cylinder to measure exactly 20 cm3 of water and there were no spillage of water so the beakers contained exactly 20 cm� of water. I also stopped the time on 100 �c. I didn't have any anomalous result and all the results were reasonably accurate. I can make the experiment more accurate by measuring the water by pipette and repeating the experiment three times for each alcohol to get an average result. We can't get an accurate result for how long it would take the alcohol to boil the water because some of the heat from alcohol merges into open air. If we carry the experiment in close area such as inside an oven the water would boil much quicker. ?? ?? ?? ?? 1 ...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 Green Plants as Organisms 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 Green Plants as Organisms essays

  1. Combustion of Alcohols

    If glass is used, then it will retain more heat before passing it on, thus the water will not get as much heat to start of with, than the alcohol is producing, thus giving misreading due to experimental inaccuracy, as glass is a reasonably good insulator.

  2. An Investigation into Species Diversity with distance along a Pingo.

    The quadrat size being examined was extended diagonally across, creating quadrats of 10cm2 followed by 15cm2, 20cm2 and so on. The number of different species were counted in each of these quadrats and recorded. 4. This was continued until the maximum size i.e.

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