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On the page below are three examples of A2 coursework, along with some comments and marks.

The Good

Good appreciation of problem, consideration of variables and  use of theory e.g. surface area comments, although the graph work on molecular  energy distribution was considered to be superfluous at this stage.  Risk  assessment lacked some detail.  Quantities determined empirically via trail  experiment.  

Sensible modification chosen with regard to acid  strength.  Effective use of simple technique, repetition of  experiments.  Good quality results wrt concentration and different acid  strengths although the temperature results seem dubious!  The moderators  felt there was insufficient credit in the concentration and different acid  results for the full mark to be awarded and in this case temperature need not  have been investigated. 

Conclusions consistent with results.  Validity of the  results considered.  Valiant attempt at good chemical use of results  incorporating good use of theory within the constraints of A Level  knowledge.   

Verdict: 27/30. Download PDF.

The Bad

Some aspects of the problem appreciated well e.g. use of  excess acid.  Calculation not clearly explained, concentration of acid  confused with amount.  Incomplete risk assessment. 

Sensible modification adopted.  Good quality results for  the effect of concentration, although the results for the change of temperature  are less reliable but interesting!

Validity of results not considered.  Conclusions are  consistent with results but there is some over interpretation.  Some  consideration of errors but no quantitative treatment

Verdict: 21/30. Download PDF.

The Ugly

Some appreciation of problem and experimental  procedures.  Error in quantity of material calculation and apparatus  selection.  Variables not fully considered.  Mistake on risk  assessment form.  

Reasonable set of experimental results.  Sensible  modification adopted.  Measurements not reported.  

Validity of results not considered, confused conclusions, very  weak error analysis. 

Verdict: 12/30. Download PDF.

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