# Heat Energy Experiment Aim: To measure the heat energy released in a burning fuel.

Heat Energy Experiment

Aim: To measure the heat energy released in a burning fuel.

Diagram:

Method:

• The apparatus was set as shown in the diagram.
• 20ml of water were measured.
• The initial temperature of the water was measured as well as the distance from the tile to the bottom of the test tube.
• The mass of the watch glass with and without the fuel was measured.
• The fuel was lighted with a lighted splint and left to burn until it ends.
• The mass of the watch glass was then re-measured.
• The final temperature of the water was recorded.

For safety reasons a heat-proof tile was placed under the watch glass and goggles were used. The fuel was lighted with a splint and not the Bunsen burner, and the experiment area was completely clear for space.

For accuracy, the maximum temperature of the water was measured. The fuel was not left for a long time as the water would evaporate and the bottom of the test tube was cleaned in order not to interfere with the heating process.

To make it a fair test, the time taken of different fuels to burn could be measured. If this happened, the apparatus should be properly washed, everything re-weighed and re-measured, and the thermometer left to cool.

Results:

(Averages)

Observations:

The results were averaged out from 2 repeats (each) for improved accuracy. ...

#### Here's what a star student thought of this essay

Punctuation, grammar and spelling all to a good level. I like the layout of this piece as it is very clear to read.

The diagram used is useful as it aids the method in being able to see exactly what the candidate will do to carry out their aim. A prediction would have showed a deeper understanding of the experiment as the candidate would have related theory to the experiment before it happened which would have gained higher marks. They do consider things which may have biased the experiment which is good to show understanding on how to improve an experiment and make it more reliable. The results table is consistent in decimal places and the calculations are correct, although I'm not sure what kind of fuel the fire lighter was as this has not been identified, and the correct scientific chemical name should have been used for easier identification. Observations are all to a good standard of accuracy. Their conclusion is good because it consists of an overall ending statement and points out possible errors and improvements.

Focus on the question is done well. The candidate is concise in how they present their answer, and their evaluation and conclusion is good. Their conclusions are also very well done and relate to the experiment well. I would have liked to have seen linkage to the science behind the experiment as to why different fuels have different energy levels as this would have shown a better understanding of the topic.