Burning peanuts to simulate cellular respiration

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					                                                    Burning peanuts to simulate cellular respiration
                                                  This lab will be assessed on Conclusion & Evaluation.


Aim
To determine the average energy content of 1g of peanut.

Method
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.

Data collection
Record your data in a suitable format.

Data processing
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

Task
    Record the raw data in an appropriate manner and present it clearly, allowing for
     easy interpretation.
    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)




                                                                                                    investigation
                                       States a conclusion, with      Evaluates weaknesses and      Suggests realistic
                                       justification, based on a      limitations.                  improvements in respect of
                                 c=2
                                       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.
                                 p=1
                                       interpretation of the data.    evaluation is weak or
                                                                      missing.
                                       States no conclusion or the    Identifies irrelevant         Suggests unrealistic
                                       conclusion is based on an      weaknesses and limitations.   improvements.
                                 n=0
                                       unreasonable interpretation
                                       of the data.

				
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