Burning peanuts to simulate cellular respiration
This lab will be assessed on Conclusion & Evaluation.
To determine the average energy content of 1g of peanut.
1. Set up a clamp stand so that it is holding a 100cm3 beaker.
2. Using a measuring cylinder, pour 50cm3 of water into the beaker.
3. Use a thermometer to record the temperature of the water.
4. Place some aluminium foil over the beaker to prevent heat loss.
5. Record the mass of a peanut using an electronic balance.
6. Use a mounted needle to carefully pierce the peanut.
7. Get the peanut burning in a Bunsen flame and hold the burning peanut directly beneath
the beaker of water until it goes out.
8. Record the temperature of the water immediately and record the mass of the remains
of the burnt peanut.
Record your data in a suitable format.
Calculate the energy content of the peanut.
E=mxcx where E = energy gained by the water
m = mass of the water
c = specific heat capacity of water
= temperature change of the water
Record the raw data in an appropriate manner and present it clearly, allowing for
Process the raw data using the calculation given above.
Draw valid conclusions and compare your results with literature values.
Evaluate the procedure used and suggest improvements to the method.
Concluding Evaluating procedure(s) Improving the
Conclusion and Evaluation (CE)
States a conclusion, with Evaluates weaknesses and Suggests realistic
justification, based on a limitations. improvements in respect of
reasonable interpretation of identified weaknesses and
the data. limitations.
States a conclusion based Identifies some weaknesses Suggests only superficial
on a reasonable and limitations, but the improvements.
interpretation of the data. evaluation is weak or
States no conclusion or the Identifies irrelevant Suggests unrealistic
conclusion is based on an weaknesses and limitations. improvements.
of the data.