Marking Guidance
Science A: Controlled Assessment Pack B 2012-2013
Marking Guidance The three exercises are marked individually and marks recorded on the Candidate Record Card. For each exercise a candidate is awarded a mark for each Assessment Objective (AO1, AO2 and AO3). A maximum of 63 marks will be awarded to each candidate. For each task set detailed guidance will be provided when necessary. Teachers should decide which band the candidate falls into using the generic descriptor and then use the detailed guidance to award the final mark for each Assessment Objective. Allocation to a band should be done on a ‘best fit’ basis. Most, but not all criteria should be met, and failure to meet every criterion will indicate a mark in the lower range of the band. Note that the bands are hierarchical, i.e. criteria for lower band(s) must be met in addition to any new criteria in the higher band.
Please use the marking guidance in conjunction with the teacher guidance.
SAFETY TASK - PACK B AO1 - Candidates recall, select and communicate knowledge and understanding
Bottom band 0-1 mark Major errors in the use of language and scientific terms or no use of scientific terms.
Communication
Risk assessment lacks both clarity and detail
Features expected of:Middle band 2-3 marks A few errors in the use of language including scientific terms. Spelling, punctuation and grammar exhibit several minor errors Risk assessment lacks some clarity or detail
Top band 4-5 marks Correct use of language including scientific terms. Spelling, punctuation and grammar correct – allow one or two minor errors All aspects of the risk assessment clear and detailed
Note that here you are assessing the clarity and detail of the risk assessment, NOT its accuracy (assessed in AO2) Results and Observations
Incomplete or inaccurate recording of results
Results are correctly recorded
AO1 assesses clarity of expression. Response may not be correct but this is assessed later.
Results are correctly recorded Temperature differences correct
SAFETY TASK - PACK B AO2 – apply skills, knowledge and understanding of science in practical and other concepts Risk assessment template is generic, not all rows need to be completed. Features expected of:Middle band 3-5 marks
Bottom band 0-2 marks Conclusion
Conclusion attempted Evaluation attempted
Inadequate risk assessment
Conclusion correctly relates temperature increase to energy in the snack food Need for improvements appreciated but not clearly expressed or not practical Limited risk assessment
Risk assessment Either no attempt is made at the risk assessment or an inaccurate hazard is identified.
Hazards and risks will be identified but the nature of the hazard my not be given, OR the risks may be described in vague terms.
Top band 6-8 marks
Conclusion correctly relates temperature increase to energy in the snack food but understands weakness of evidence
All or nearly all hazards, risks and precautions listed (see below)
Every hazard identified must have its nature specified.
RISK ASSESSMENT HAZARD Snack food spits during burning
RISK Burns to the hands
Broken glass can cut
Knocking over the clamp stand and breaking the boiling tube. Over tighten clamp
Hot boiling tube
Burns to the skin if not tube handled
CONTROL MEASURE Insert into needle into a bung and place under boiling tube no need to hold the needle with burning food or other. Any reasonable precaution to prevent knocking over clamp stand. Do not over tighten clamp
Wait for boiling tube to cool before removing from clamp or handle boiling tube with tongs.
SAFETY TASK - PACK B AO3 - analyse and evaluate evidence, make reasoned judgements and draw conclusions based on evidence.
Bottom band 0-2 marks
Features expected of:Middle band 3-5 marks
Some comment made, but with no judgement of strength of evidence Invalid or no suggestion for improvement.
Mention of variation in results but no coherent comment on its significance. Number of repeats considered but judgement weak. Weak or poorly explained judgement of strength of evidence for/against hypothesis. Some valid suggestion for improvement.
Top band 6-8 marks
Reasonable judgement of strength of evidence
Appropriate improvements suggested e.g. prevent heat loss, ensure complete burning of food.
Conclusion must be supported by the data collected. Reference made to the temperature increase as an indicator of the energy in the food. Correct explanation of the possibility of the variability of repeats e.g. incomplete burning of the food, some food may drop off, all foods may not be the same distance away from the test tube, heat loss to the air.
Marking Guidance The three exercises are marked individually and marks recorded on the Candidate Record Card. For each exercise a candidate is awarded a mark for each Assessment Objective (AO1, AO2 and AO3). A maximum of 63 marks will be awarded to each candidate. For each task set detailed guidance will be provided when necessary. Teachers should decide which band the candidate falls into using the generic descriptor and then use the detailed guidance to award the final mark for each Assessment Objective. Allocation to a band should be done on a ‘best fit’ basis. Most, but not all criteria should be met, and failure to meet every criterion will indicate a mark in the lower range of the band. Note that the bands are hierarchical, i.e. criteria for lower band(s) must be met in addition to any new criteria in the higher band.
Please use the marking guidance in conjunction with the teacher guidance.
SAFETY TASK - PACK B AO1 - Candidates recall, select and communicate knowledge and understanding
Bottom band 0-1 mark Major errors in the use of language and scientific terms or no use of scientific terms.
Communication
Risk assessment lacks both clarity and detail
Features expected of:Middle band 2-3 marks A few errors in the use of language including scientific terms. Spelling, punctuation and grammar exhibit several minor errors Risk assessment lacks some clarity or detail
Top band 4-5 marks Correct use of language including scientific terms. Spelling, punctuation and grammar correct – allow one or two minor errors All aspects of the risk assessment clear and detailed
Note that here you are assessing the clarity and detail of the risk assessment, NOT its accuracy (assessed in AO2) Results and Observations
Incomplete or inaccurate recording of results
Results are correctly recorded
AO1 assesses clarity of expression. Response may not be correct but this is assessed later.
Results are correctly recorded Temperature differences correct
SAFETY TASK - PACK B AO2 – apply skills, knowledge and understanding of science in practical and other concepts Risk assessment template is generic, not all rows need to be completed. Features expected of:Middle band 3-5 marks
Bottom band 0-2 marks Conclusion
Conclusion attempted Evaluation attempted
Inadequate risk assessment
Conclusion correctly relates temperature increase to energy in the snack food Need for improvements appreciated but not clearly expressed or not practical Limited risk assessment
Risk assessment Either no attempt is made at the risk assessment or an inaccurate hazard is identified.
Hazards and risks will be identified but the nature of the hazard my not be given, OR the risks may be described in vague terms.
Top band 6-8 marks
Conclusion correctly relates temperature increase to energy in the snack food but understands weakness of evidence
All or nearly all hazards, risks and precautions listed (see below)
Every hazard identified must have its nature specified.
RISK ASSESSMENT HAZARD Snack food spits during burning
RISK Burns to the hands
Broken glass can cut
Knocking over the clamp stand and breaking the boiling tube. Over tighten clamp
Hot boiling tube
Burns to the skin if not tube handled
CONTROL MEASURE Insert into needle into a bung and place under boiling tube no need to hold the needle with burning food or other. Any reasonable precaution to prevent knocking over clamp stand. Do not over tighten clamp
Wait for boiling tube to cool before removing from clamp or handle boiling tube with tongs.
SAFETY TASK - PACK B AO3 - analyse and evaluate evidence, make reasoned judgements and draw conclusions based on evidence.
Bottom band 0-2 marks
Features expected of:Middle band 3-5 marks
Some comment made, but with no judgement of strength of evidence Invalid or no suggestion for improvement.
Mention of variation in results but no coherent comment on its significance. Number of repeats considered but judgement weak. Weak or poorly explained judgement of strength of evidence for/against hypothesis. Some valid suggestion for improvement.
Top band 6-8 marks
Reasonable judgement of strength of evidence
Appropriate improvements suggested e.g. prevent heat loss, ensure complete burning of food.
Conclusion must be supported by the data collected. Reference made to the temperature increase as an indicator of the energy in the food. Correct explanation of the possibility of the variability of repeats e.g. incomplete burning of the food, some food may drop off, all foods may not be the same distance away from the test tube, heat loss to the air.
