GCSE. Sciences Guidance on Controlled Assessment

Transcription

1 GCSE Sciences Guidance on Controlled Assessment

2 Contents Introduction to Controlled Assessment 01 Step-by- Guide for 04 n Science A n Additional Science n Biology n Chemistry n Physics Controlled Assessment in Detail 11 Step 1 Planning Step 2 Reporting on the planning and research Step 3 Practical work Step 4 Processing primary data Step 5 Analysing results Step 6 Marking the ISA Step-by- Guide for 33 Science B Controlled Assessment in Detail 39 Step 1 Planning and research Step 2 Reporting on the planning and research Step 3 Practical work Step 4 Data processing, analysis and evaluation Step 5 Marking the Controlled Assessment Administration of Controlled Assessments 62 FAQs 64

3 Introduction Controlled Assessment is a new form of internal assessment that has been introduced to replace coursework for all awarding bodies. In this guide, we re providing detailed support and advice on how to prepare, sit and assess Controlled Assessment for the following AQA GCSE Science specifications: Science A Additional Science Biology Chemistry Physics Science B To help you understand the changes, we ve provided -by- instructions about the Controlled Assessment process and outlined what is expected of your candidates. At each, you will see candidate exemplar material to clearly show the new Controlled Assessment process. 1

4 The Controlled Assessment Process Controlled Assessment consists of three stages stage 1 stage 2 stage 3 Task Setting All Controlled Assessments are set by AQA and will be available for submission in the January and June examination series of each year. (NB: Science B submission is available in June only). Task Taking A description of how candidates carry out the tasks and the conditions under which assessment takes place is illustrated on the right: Task Marking Tasks are internally marked, using the mark guidance supplied by AQA and externally moderated by an AQA moderator. Stages of task Research and data collection Writing, analysis, evaluation and review Level of control Limited Control limited supervision High level of control formal supervision Description Candidates can work unsupervised and outside of the classroom. Candidates will carry out practical work under supervision. Candidates work individually to complete their reports under conditions of high control at the centre and under direct, formal supervision. Levels of Control Each of the three stages has a level of control to ensure reliability and authenticity and to make assessments more manageable for teachers and candidates. Levels of control for GCSE Science are explained below: Limited Control with low level limited supervision Candidates can complete work without direct supervision, outside of the classroom. This work will not contribute directly to assessable outcomes. Candidates can access resources and work in groups. Teachers can provide limited guidance to candidates. High Level of Control formal supervision Candidates must be in direct sight of the teacher at all times. Use of resources is tightly prescribed. Candidates must not communicate with each other. Candidates must complete all work independently. No assistance can be given to candidates. 2

5 Getting Started: For AQA GCSE Science A, Additional and Separate Sciences, the Controlled Assessment takes the form of an Investigative Skills Assignment (ISA). For Science B, the Controlled Assessment (Using Practical and Investigative Skills) takes the form of a contextualised investigation based on a unit from the specification. To get started, you need to: 1 Read the Teachers Notes Each year, AQA will issue centres with a set of Teachers Notes on e-aqa. These will contain details of the experiments that may be used for the Controlled Assessment for that year. Under the new criteria, each Controlled Assessment is only operational for a 12 month period. However, AQA proposes to release the Teachers Notes, and other related material one year before its operational period. This should enable more flexibility for centres, but centres should be aware of the fact that a Controlled Assessment cannot be submitted for moderation before its operational period. Each year, AQA will supply: One ISA each for Units B1, C1 and P1. These may only be used for Science A. One ISA each for Units B2, C2 and P2. These may only be used for either Additional Science or the Separate Sciences. Two ISAs each for Units B3, C3 and P3. These may only be used for the Separate Sciences. Three Controlled Assessments for Science B (one for each unit). 2 Choose a Controlled Assessment task from e-aqa The first Controlled Assessment tasks will be available from May 2011 on e-aqa. aqa.org.uk/eaqa-register 3 Understand the new criteria and what candidates need to complete Your Science candidates will need to: Plan practical ways to answer scientific questions and test hypotheses. Devise appropriate methods for the collection of numerical and other data. Assess and manage risks when carrying out practical work. Collect, process, analyse and interpret primary and secondary data including the use of appropriate technology. Draw evidence-based conclusions. Evaluate methods of data collection and the quality of the resulting data. Your Additional Science and Separate Science candidates will also need to: develop hypotheses. 3

6 Step-by- Guide These Step-by- instructions are a guide for completing Controlled Assessment for: Science A Additional Science Biology Chemistry Physics To get started, choose an Investigative Skills Assignment (ISA) from the Teachers Notes on e-aqa. Teachers should then: explain to the candidates the context of the investigation explain to the candidates the nature of the problem to be investigated provide the hypothesis supplied by AQA (Science A only) follow the 6 s below on completing an ISA. Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT 1 Planning (limited control) Candidates are given the opportunity to carry out an investigation. They need to research and identify a method(s) that could be used. In some cases they will be asked to research one method or in some cases, two methods. Helpful hints: candidates may use technology such as the internet or CD-ROMs for their research, textbooks or any other appropriate sources of information candidates should research the context of the investigation candidates should research a method or methods for the experiment. This should include a risk assessment candidates can create one A4 side of their own research notes to use in 2 and 5. This should be done on the Candidate Research notes sheet provided by AQA. 4

7 Reporting on the planning research (high control) Candidates will need to produce a blank table ready for the results of the investigation. This may be produced at the same time as the candidates are answering section 1 of the ISA, or at any other convenient time prior to the practical work being carried out. Candidates will be given Section 1 of the ISA to answer. They will need to work on their own and under controlled conditions to answer it. Candidates can use their own Candidate Research notes. Section 1 is a 45 minute written test with 20 marks available. Helpful hints: before undertaking Section 1, make sure your candidates know: the context of the investigation and how it might be applied in real life key words such as hypothesis what variables in an investigation they need to consider and manage different ways to test a hypothesis how to write a detailed plan of a chosen method possible hazards and risks and how to minimise them different tables that are used to record results. Practical work (limited control) Candidates perform the practical experiment either individually or in groups. Candidates may, depending on circumstances, use the method that they have planned or a method provided either by the teacher or by AQA. 2 3 Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT Helpful hints: if a teacher decides that the method produced by the candidate(s) is unworkable, unsafe or unmanageable, then a method may be provided AQA will supply a method that may be used in such circumstances or the teacher may provide one after a candidate has submitted his or her own blank table, teachers may supply a blank table in which candidates can record their results. Processing primary data (high control) Candidates will be required to draw a graph or bar chart of their results. 4 Helpful hints: candidates may use a computer to create their graph but this must be done under the direct supervision of the teacher and must be printed straight away for this part of the investigation candidates must work individually under direct supervision. 5

8 Step-by- guide on completing an ISA Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT 5 6 Analysing results (high control) Candidate will be given Section 2 of the ISA, which will include questions concerning conclusions and evaluation. Section 2 is a 50 minute written test with 30 marks available. Helpful hints: before undertaking Section 2, make sure your candidates know: how to analyse results and draw conclusions how to match results to a hypothesis how to evaluate the method of collecting data and the quality of the results how to analyse secondary data. Marking the ISA Section 1 and Section 2 of the ISA are marked internally using the marking guidelines supplied by AQA. Marking should be done in red ink, and annotations made where necessary to show the moderator the reasons for the decisions. Helpful hints: candidates may improve their marks by carrying out another Controlled Assessment appropriate to that subject, but not the same one that has already been completed if more than one Controlled Assessment has been completed, submit the one with the highest mark. Key notes: To view the Teachers Notes make sure you have access to e-aqa. If not, register at aqa.org.uk/eaqa-register You will be provided with your own CAU Adviser. See throughout the Controlled Assessment guide exemplar material. For Units 2 and 3 CAUs, the candidates must supply their own hypothesis. If you have any questions regarding the CAU call the GCSE Science subject team on

9 Administration: Teachers Notes Controlled Assessment Science A ISA PU1.x Specific Heat Capacity (Specimen) For use from May 20xx to April 20xx Teachers Notes This ISA relates to Science A Unit 3: P1.1 The transfer of energy by heating processes and the factors that affect the rate at which that energy is transferred Topic of investigation Energy can be transferred from one place to another by work or by heating processes. We need to know how this energy is transferred and which heating processes are most important in a particular situation. Overview Candidates should: plan practical ways to answer scientific questions and test hypotheses devise appropriate methods for the collection of numerical and other data assess and manage risks when carrying out practical work collect, process, analyse and interpret primary and secondary data including the use of appropriate technology draw evidence-based conclusions evaluate methods of data collection and the quality of the resulting data. The teacher should describe the context in which the investigation is set and outline the problem that is to be investigated. Candidates should be given the hypothesis: There is a link between the mass of water being heated and the temperature rise. Candidates will be required, in section 1 of the ISA, to provide a full plan of the method that they have chosen to use. Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT Candidates will need to decide on which variables need to be controlled and research a method that could be used, with particular reference to hazards and risk assessment. Once the candidates have researched and written up their own plan in the first part of the ISA they should carry out their investigation providing that it is workable, safe and manageable in the laboratory. Candidates will need to decide on which variables need to be controlled and research a methods that could be used, with particular reference to hazards and risk assessment. Candidates will be required, in Section 1 of the ISA, to provide a full plan of the method that they have chosen to use. After this, candidates take Section 2 of the ISA, in which they analyse their results and use data selected from a data sheet of secondary data to comment on the outcomes of their experimental work. Risk Assessment It is the responsibility of the centre to ensure that a risk assessment is carried out. Copyright 2011 AQA and its licensors. All rights reserved. The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales (company number ). Registered address: AQA, Devas Street, Manchester M15 6EX Science A Specimen Controlled Assessment Physics PU1.x Teacher s Notes 7

10 Administration: Teachers Notes Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT Stage 1 Planning research (Limited control) Candidates should be given the opportunity to plan an investigation to test the hypothesis. The investigation should be set in a context by the centre. Examples of suitable contexts could include, eg electric storage heaters, oil-filled radiators or hot water tanks. Whichever context is chosen, the teacher must take care to present it in such a way that it does not limit the candidates' choice of method for the investigation. Candidates should then independently research an appropriate plan and decide for themselves factors such as the range, interval and number of repeat readings that they should take, and the variables that need to be controlled. They will need to undertake independent research to identify a method that could be used. During this time they may make one A4 side of their own research notes for use during Section 1 of the ISA. The Candidate Research notes sheet is attached. Candidates may use technology such as the internet or CD-ROMs, textbooks or any other appropriate sources of information for their research. Candidates should also research how the results of the investigation might be useful in the specified context. There is no set time allocation for this research, but it is anticipated that it should take no longer than 3 hours of work. This research may be done in the laboratory or elsewhere. The teacher should check and sign these notes before allowing the candidate to use them during the completion of Section 1 of the ISA. The candidate may use these notes while completing Section 1 and Section 2 of the ISA. When the candidate has completed Section 2, the notes should be stapled to the ISA. Stage 2 Reporting on the planning research (High control) For this stage, candidates must work individually under direct supervision. After the Stage 1 planning session, candidates should be given Section 1 of the ISA and should work on their own, under controlled conditions, to answer it. Candidates may take brief notes of up to one A4 side of their own research into the formal assessment period. These must be checked to ensure they do not include plagiarised text, detailed planning grids or a pre-prepared draft. Section 1 requires candidates to: consider the variables (independent, dependent and control) that they will need to manage during the investigation report on their research into how to test the hypothesis they have been given give reasons for why one method is preferable to the other write a detailed plan of their chosen method identify possible hazards and write down how the risks may be minimised draw a suitable blank table in which the results could be recorded for the method they have planned. Candidates may choose to use technology to draw the table, eg a computer spreadsheet. This must be done under the direct supervision of the teacher. It should not be stored, but should be printed immediately and attached to the ISA paper. While answering Section 1 of the ISA, candidates must not be allowed to use textbooks, the Internet or any other source of help apart from their own Candidate Research notes. 8

11 Administration: Teachers Notes Stage 3 Practical work (Limited control) For this stage, candidates may work individually or in groups. Candidates may work in groups to carry out their plans, but each candidate must contribute to the collection of data. Candidates may use appropriate technology during the practical work, eg data loggers or sensors. If the teacher deems that the plan produced by the candidate is invalid, unworkable, unsafe, unmanageable or for any other reason unsuitable, then the teacher may provide a method. An example of a suitable method is attached to these notes. The teacher may also provide a blank table for the results if the: table produced by the candidate is inadequate, in which case the candidate would not be able to score full marks for producing a table candidate carries out an investigation from a method provided by the teacher, in which case the candidate would be able to score full marks for producing a table. Stage 4 Processing primary data (High control) For this stage, candidates must work individually under direct supervision. Candidates should be given back their table of results, and asked to display these on a bar chart or line graph. Candidates must decide for themselves which format is the more appropriate for any particular investigation. Candidates may use appropriate technology to do this, eg a graph-drawing program on a computer. If a candidate chooses to use a computer, this must be done under the direct supervision of the teacher and the bar chart or line graph must be printed straight away. Candidates must not be allowed to take their results and chart or graph away, the teacher must collect them at the end of the lesson. Stage 5 Analysing results (High control) For this stage, candidates must work individually under direct supervision. The candidates should also be given a table of results from other candidates in the class, or the teacher's results. Candidates should use the results of others to analyse the validity of their results. Candidates should be given Section 2 of the ISA and should also be given: a copy of the question paper their own table of results a copy of the results of other candidates in the class a reminder of the context in which the investigation was set, this may be printed on the class results table. their own chart or graph the AQA supplied Data Sheet their Candidates Research notes. The teacher should have recorded the marks for each candidate s table and graph/chart before these are given back. This will ensure that a candidate cannot gain an unfair advantage by making any alterations to them at this stage. Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT Section 2 will require candidates to: analyse their own results draw a conclusion match their achieved results to the original hypothesis that was given to them evaluate the method of collection and the quality of the resulting data analyse further secondary data drawn from the same topic area as their original investigation relate their findings to the context set in the ISA. 9

12 Administration: Teachers Notes Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT Section 2 will require candidates to: analyse their own results draw a conclusion match their achieved results to the original hypothesis that was given to them evaluate the method of collection and the quality of the resulting data analyse further secondary data drawn from the same topic area as their original investigation relate their findings to the context set in the ISA. 10

13 Controlled Assessment in Detail 1 Planning The discussion session After the teacher has chosen the Controlled Assessment task, the teacher should then explain to candidates the nature of the problem to be investigated. In Unit 1 ISAs for Science, the teacher will give the candidates a hypothesis which has been supplied by AQA. In Unit 2 and 3 ISAs, candidates must supply their own hypothesis. Research (limited control) After the discussion session, candidates should be told to research one or two possible methods of carrying out the investigation. Whether it is one or two will depend on the particular ISA. This could be done as a homework session. They will also need to research the context that has been set and any health and safety issues with the method(s). They will be allowed to make notes on one side of A4, which they will take into Section 1 and 2 of the ISA. AQA will provide a Candidate Research notes sheet on e-aqa which must be signed by both the candidate and the teacher. Key points: Collectively candidates could produce a huge variety of methods to perform their practical work. If the teacher decides that the method produced by the candidate(s) is unworkable, unsafe or unmanageable, then the teacher may provide a method. AQA will supply a method that may be used in such circumstances which teachers can adapt to their own programme of study. Alternatively, teachers may provide their own method. Teachers should always complete an ISA Explanation Sheet. The Candidate s Research notes sheet, of which an example can be found on the following page, will be used by the candidate for both of the written sections of the ISA. 11

14 Planning CONTROLLED ASSESSMENT IN DETAIL 1 SCYC ASCC BLYC CHYC PHYC Centre Number Centre-assessed work Candidate notes GCSE Science (xxxx) Additional Science (xxxx) Biology (xxxx) Chemistry (xxxx) Physics (xxxx) V The New Academy Centre Name WARD, JAMES 0107 Candidate's Name Candidate's Number SPECIFIC HEAT CAPACITY Investigation Title PUI.x ISA number: The notes the candidate takes into the Controlled Assessment task are to be recorded in the spaces on this sheet. This sheet should be given to the teacher for checking before it is used in Section 1 of the ISA. When Section 1 of the ISA has been completed, this sheet should be retained by the teacher for subsequent use with Section 2 When Section 2 of the ISA has been completed, this sheet should be stapled to it... Declaration I confirm that these are the only preparation notes used in the Controlled Assessment task. Teacher signature GFisky Candidate J. Ward signature 27 / I / I I Date: 12

15 Planning Hypothesis There is a link between the mass of the water being heated and the temperature rise. Research sources Concise Twentieth Century Science D.W. Archer, Internet 1 CONTROLLED ASSESSMENT IN DETAIL Method(s) Electric immersion heater or Bunsen. Heat different masses of water for the same length of time. Measure temperature at start and end. Equipment Immersion heater and power supply. Beaker. Thermometer. Stopwatch. Risk assessment issues Hot water Bunsen burner might set fire to something. Relating the investigation to the context Boiling water in a kettle only fill the amount needed otherwise it takes too long and wastes energy

16 2 Reporting on the planning and research Blank table for the results (high control) Just as in the previous specification, candidates will be required to independently produce a blank table for their results. The table should be able to accommodate everything that the candidate is going to measure and record during the investigation. The table should include appropriate headings and units. After the candidate has produced a table, the teacher will mark the blank table. When the table has been marked, the teacher may return it to the candidate to use in the investigation. Alternatively teachers may supply a blank table in which candidates can record their results. Section 1 of the ISA (high control) Candidates take Section 1 of the ISA written test. Up to 45 minutes is allowed for this. The test may be taken in the normal teaching room, provided that candidates can be accommodated in such a way as to prevent any copying or unauthorised collaboration. Any access arrangements that apply to individual candidates for written papers, eg extra time for statemented candidates, or the use of a scribe or a reader will also apply to the ISA. Risk assessment Section 1 will also contain questions about the hazards and risks associated with the researched methods. Section 1 of the ISA will contain questions about the methods that candidates have researched and is worth 20 marks of the overall 50 allocated to the Controlled Assessment. Each candidate may use their Candidate Research notes sheet made during their research. Key points: Candidates will need to carry out a risk assessment in order to be able to answer some of the questions in Section 1. Make sure your candidates know key words such as hypothesis and variables. 14

17 Reporting on the planning and research Centre Number Surname Other Names Notice to Candidate. The work you submit for assessment must be your own. If you copy from someone else or allow another candidate to copy from you, or if you cheat in any other way, you may be disqualified. Candidate Declaration. I have read and understood the Notice to Candidate and can confirm that I have produced the attached work without assistance other than that which is acceptable under the scheme of assessment. Candidate Signature Science A Candidate Number WARD JAMES J.Ward Date 1/2/11 General Certificate of Secondary Education June 20xx and January 20xx (Specimen) Controlled Assessment ISA PU1.x Specific Heat Capacity Section 1 For moderation in May 20xx and January 20xx Time allowed up to 45 minutes For Teacher s Use Section Section 1 (/20) Section 2 (/30) TOTAL (max 50) Mark 2 CONTROLLED ASSESSMENT IN DETAIL For this paper you must have: your Candidate Research notes a pencil and a ruler. You may use a calculator. Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page. Answer all questions in Section 1 in the spaces provided. You may use extra paper. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this paper is 20. The maximum mark for the Controlled Assessment Unit is 50. You are reminded of the need for good English and clear presentation in your answers. Details of additional assistance (if any). Has the candidate received any help or information from anyone other than the subject teacher(s) in the production of this work? If the answer is yes give the details below or on a separate page. Yes No / Teacher Declaration: I confirm that the candidate s work was conducted under the conditions laid out by the specification. I have authenticated the candidate s work and am satisfied that to the best of my knowledge the work produced is solely that of the candidate. GFisky I / 2 / I I Signature of teacher Date. As part of AQA s commitment to assist students, AQA may make your CAU available on a strictly anonymous basis to teachers, examining staff and students in paper form or electronically, through the Internet or other means, for the purpose of indicating a typical mark or for other educational purposes. In the unlikely event that your CAU is made available for the purposes stated above, you may object to this at any time and we will remove the work on reasonable notice. If you have any concerns please contact AQA To see how AQA complies with the Data Protection Act 1988 please see our Privacy Statement at aqa.org.uk 15

18 Reporting on the planning and research CONTROLLED ASSESSMENT IN DETAIL 2 comments Q1 2 marks The candidate has clearly identified one relevant source (the book) and has explained why this was the more useful. Simply saying The Internet is too vague Hypothesis: 2 Section 1 There is a link between the mass of water being heated and the temperature rise. 1 Think about the research that you did to find out how to test this hypothesis. Name two sources that you used for your research. Concise Twentieth Century Physical Science... (Archer et. al), The Internet. Which of these sources did you find the more useful? Concise Twentieth Century Science Why was this source the more useful? It gave me a complete method, with a diagram. (3 marks) Do not write outside the box 2 2 In this investigation, you will need to control some of the variables. comments Q2 2 marks A suitable control variable has been given (the length of time for which energy is supplied). A suitable range has been given. The candidate has not mentioned how the temperature rise should be obtained (it is actually calculated rather than measured) and the way in which the results could be used ( see if this gave a good difference ) is too vague. Write down one variable that will need to be controlled. The length of time I switched the heat on for. Describe briefly how you would carry out a preliminary investigation to find a suitable value to use for this variable. You should also explain how the results of this work will help you to decide on the best value for this variable. I would put the heater in the water and leave it switched on for 30 seconds. Then I would put it in for 5 minutes. In each case I would measure the temperature rise and see if this gave a good difference. (3 marks) 2 16

19 Reporting on the planning and research 3 In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. 3 Describe how you plan to do your investigation to test the hypothesis given. You should include: the equipment that you plan to use how you will use the equipment the measurements that you are going to make how you will make it a fair test a risk assessment 12 volt immersion heater and power supply 1 litre beaker Thermometer Stopwatch equipment Do not write outside the box 2 CONTROLLED ASSESSMENT IN DETAIL Method Put 1 kg of water in the beaker and measure the temperature. Put immersion heater in and switch on for 2 minutes. Measure the temperature after 2 minutes. Repeat for 800g, 600g, 400g and 200g. Fair test. The water should start at the same temperature each time, and the heater should be switched on for the same amount of time each time. Turn over 17

20 Reporting on the planning and research CONTROLLED ASSESSMENT IN DETAIL Risk assessment... If the water gets very hot and the beaker gets.. knocked over, it could scald someone. So I will.. make sure that all books, bags etc. are well away.. from it. Also, I will make sure that the water does.. not get too hot... Do not write outside the box.. comments.. Q3 Apart from stating how the temperature rise should be calculated from the initial and.. final temperatures, the method is clear and another person should be able to follow this method and obtain valid results... The candidate has clearly stated control variables that should be kept the same.. in order to make the test fair. However, there is no indication as to how these variables will be controlled or monitored... The equipment that the candidate proposes to use is clearly described and is appropriate... The risk assessment contains an identification of the hazard (hot water),.. the associated risk (being scalded if the water is spilt) and two control measures.. (keeping book etc away and not overheating the water).. The method is described in a logical sequence of s. Even though the candidate has used.. bullet points in some places, the spelling, punctuation, grammar and the correct.. use of technical terms are sufficient to meet all the relevant criteria... 7 marks..... (9 marks) 7 18

21 Reporting on the planning and research 4 When you have completed your experimental work, you will be asked to share your results with others. Explain the advantages of sharing your results with others. 5 I could have used a Bunsen burner to heat the water instead of the electric immersion heater. But then a lot of heat would have gone into the room instead of the water, and the flame on the Bunsen burner might not have been the same all the time. (3 marks) 5 You will need a table for your results. If you have not already produced a table for all the data that will need to be recorded, you should do so now. You may use technology such as ICT to do this if you wish. Attach your table below. Make sure that you hand in your A4 side of research notes and your blank table for the results with this paper. You will be awarded up to two marks for your table. (2 marks) Mass of water in grams Temp at start Temp at end Do not write outside the box 2 1 comments Q4 2 marks comments Q5 1 mark 2 The candidate has the idea of being able to compare the results in order to check them, and has also referred to the idea of calculating a mean. However, the advantage of calculating a mean is not mentioned, nor is there any reference to reproducibility. The table is incomplete, as the units for temperature are missing CONTROLLED ASSESSMENT IN DETAIL END OF SECTION 1 Copyright 2011 AQA and its licensors. All rights reserved 19

22 3 Practical work The practical work (limited control) Just as in the previous specification, candidates then perform the practical experiment. Candidates may use the method that they have chosen and planned. If the teacher decides that the method produced by the candidate(s) is unworkable, unsafe or unmanageable, then the teacher may provide a method. AQA will supply a method that may be used in such circumstances. The marking guidelines supplied by AQA will provide teachers with indicators as to how marks will be awarded based on the methods candidates choose. There is no specified time limit for the practical work, although it is anticipated that most experiments should be capable of being completed within a one hour lesson. If necessary however, the experiment may be continued over a number of lessons. Any paperwork, eg result tables, should / must be collected in at the end of the first lesson, and returned to the candidate at the start of the next lesson. In some ISAs it will be necessary for the teacher to pool the results of the class. This is so that each candidate may be allowed to see the results of others in order to better evaluate them and form a conclusion. In cases where there is only a single candidate, then the teacher s own results may be used for comparison. Key points: As before, it is possible that candidates, based on their research, will be carrying out a variety of different methods. Where this occurs, or where candidates methods are deemed to be unworkable, unsafe or unmanageable, teachers can provide their own material or are able to supply the method given by AQA. Where the methods generated are unworkable, unsafe or unmanageable then the AQA marking guidelines will dictate how marks are apportioned and will take into account experiments which are scientifically accurate but not possible due to circumstances such as lack of equipment. Even if a candidate does not go on to carry out his or her plan for the experiment, that candidate may still be awarded up to maximum marks for the written plan in Section 1 of the ISA. 20

23 ISA Explanation Sheet Centre Number ISA Code ISA Title PUI.x Did the candidates use their own plans? YES / NO ISA Explanation Sheet This sheet should accompany each ISA Date Practical Carried Out Name of Teacher If NO give details of any changes you made for this investigation. G. FISKY CONTROLLED ASSESSMENT IN DETAIL 30 STUDENTS IN THE GROUP PRODUCED ABOUT A DOZEN DIFFERENT METHODS. WHICH I CONSIDERED UNMANAGEABLE. SO WE USED THE AQA METHOD. PUI.x DOMESTIC HOT WATER TANKS Any other Information: Teacher Signature: GFisky Please attach any experimental worksheet or outline used by the candidates to carry out the investigation. 21

24 Practical work CONTROLLED ASSESSMENT IN DETAIL 3 If the teacher deems that the plan provided by the candidate is unworkable, unsafe or unmanageable or for any other reason unsuitable, then the teacher may provide a plan. The following is an example of a method that could be supplied by the teacher. Example of a Method Sheet for Physics Controlled Assessment PU1.x Specific Heat Capacity It is the responsibility of the centre to ensure that a risk assessment is carried out. Hypothesis: It is suggested that there is a link between the mass of water being heated and the temperature rise. You will need to prepare a table for the results. Apparatus List: Large beakers Measuring cylinder Low voltage immersion heater + power supply or a Bunsen burner Thermometer Stopwatch Method: 1. Measure out 1 kg of cold water into a large beaker. 2. Measure and record the initial temperature of the water. 3. Put an immersion heater into the water and switch on for a fixed period of time, eg 10 minutes. 4. Measure and record the temperature at the end. 5. Work out the change in temperature. 6. Repeat for several other masses of water. NOTE: If you are using a Bunsen burner instead of an electric immersion heater, make sure that you do not change the setting on the burner during the experiment. Copyright 2011AQA and its licensors. All rights reserved 22

25 4 Processing primary data Drawing the graph or bar chart (high control) Just as in the previous specification, candidates will be required to draw a graph or bar chart of their results. Examples of marking guidelines for the graph / bar chart can be found towards the end of this document. Candidates may be awarded up to 4 marks for an appropriate bar chart or line graph. Key points: Computers and information technology can be used to generate the line graph or bar chart but this must be done under direct supervision of the teacher. 23

26 Processing primary data CONTROLLED ASSESSMENT IN DETAIL 4 Mass of water in grams Temp at start in ºC Temp at end in ºC J WARD 0107 Temp rise in ºC

27 Processing primary data J WARD CONTROLLED ASSESSMENT IN DETAIL Temperature rise in ºC Mass of water in grams 25

28 5 Analysing results Section 2 of the ISA (high control) Section 2 will include questions concerning conclusions and evaluation. 50 minutes are allowed for this section, but again the usual access arrangement rules will apply. AQA will supply a data sheet containing a number of case studies for candidates to use in Section 2 of the ISA. Section 2 will also include a question asking candidates to relate the findings from the investigation to the context they were given. Candidates may again use their Candidate Research notes that they made during their research. Key points: Secondary data is given in Section 2 to which candidates will need to refer. Therefore candidates should be familiar with using this type of stimulus material and have the necessary experience in order to evaluate the data given. 26

29 Analysing results Centre Number Surname Candidate Number Other Names Notice to Candidate. The work you submit for assessment must be your own. If you copy from someone else or allow another candidate to copy from you, or if you cheat in any other way, you may be disqualified. Candidate Declaration. I have read and understood the Notice to Candidate and can confirm that I have produced the attached work without assistance other than that which is acceptable under the scheme of assessment. Candidate Signature Science A WARD Date J.Ward 27/1/11 General Certificate of Secondary Education June 20xx and January 20xx (Specimen) Controlled Assessment ISA PU1.x Specific Heat Capacity Section 2 For moderation in May 20xx and January 20xx JAMES For Teacher s Use Section Section 1 (/20) Section 2 (/30) TOTAL (/50) Mark 5 CONTROLLED ASSESSMENT IN DETAIL Time allowed 50 minutes For this paper you must have: results tables and charts or graphs from your investigation the Data Sheet(enclosed) your Candidate Research notes a pencil and a ruler. You may use a calculator. Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page. Answer all questions in Section 2 in the spaces provided. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this paper is 30. The maximum mark for the Controlled Assessment Unit is 50. You are reminded of the need for good English and clear presentation in your answers. Details of additional assistance (if any). Has the candidate received any help or information from anyone other than the subject teacher(s) in the production of this work? If the answer is yes give the details below or on a separate page. Yes No / Teacher Declaration: I confirm that the candidate s work was conducted under the conditions laid out by the specification. I have authenticated the candidate s work and am satisfied that to the best of my knowledge the work produced is solely that of the candidate. GFisky Signature of teacher I / 2 / I I Date. As part of AQA s commitment to assist students, AQA may make your CAU available on a strictly anonymous basis to teachers, examining staff and students in paper form or electronically, through the Internet or other means, for the purpose of indicating a typical mark or for other educational purposes. In the unlikely event that your CAU is made available for the purposes stated above, you may object to this at any time and we will remove the work on reasonable notice. If you have any concerns please contact cfg@aqa.org.uk To see how AQA complies with the Data Protection Act 1988 please see our Privacy Statement at aqa.org.uk 27

30 Analysing results CONTROLLED ASSESSMENT IN DETAIL 5 2 comments Q1(a) 3 marks All three variables have been correctly identified Hypothesis: These questions are about the investigation that you were given to test the hypothesis. There is a link between the mass of water being heated and the temperature rise. 1 (a) What were the variables in the investigation you did? The mass of water The independent variable was... The temperature rise after 2 minutes The dependent variable was... The length of time the water was One control variable was... (3 marks) heated for. 1 (b) Think about the way in which you took your measurements. Do not write outside the box 3 comments Q1(b) 1 mark The candidate has correctly stated the resolution. However, there is no reason given as to why measuring to 1/10th of a degree would be better. Also the mention of accuracy suggests that the candidate does not fully understand the meaning of the term resolution. Resolution means the smallest scale division on the measuring instrument that you were using. What was the resolution of your measurement of the dependent variable? 1ºC Do you think that this resolution was appropriate for this investigation? Explain your answer. No, it would have been better if I had a thermometer that measured to 1/10th degree, because then it would have been more accurate. (3 marks) 1 comments Q1(c) 2 marks The candidate s results do support the hypothesis, and the candidate has stated this. There is reference to a pattern, but the candidate has failed to quote any numerical evidence to support this. 1 (c) The hypothesis that you were given before you started your investigation is printed above. Do your results support this hypothesis? Explain your answer. Yes, because the more water I used the lower the temperature rise. There was a pattern. (3 marks) 2 28

31 Analysing results 1 (d) You have been given the results obtained by other people in your class or by your teacher. Do these other results show that this investigation is reproducible? Explain your answer using data. 3 We all got the same pattern more water meant a smaller temperature rise, but they weren t exactly the same as mine because some of them started at different temperatures... (3 marks) 1 (e) If you were to repeat your experiment, would you make any changes to your method? Do not write outside the box 1 comments Q1(d) 1 mark 5 The candidate has not quoted any numerical data. Although the candidate has suggested a possible reason as to why the results of others may have been different, there is no explanation of this. CONTROLLED ASSESSMENT IN DETAIL Tick the box beside your answer. Yes, I would make changes to my method V No, I would not make changes to my method. Explain why you would or would not make any changes. I would insulate the beaker and put a lid on it. This would stop any heat escaping through the walls of the beaker or any heat being lost by the water evaporating... comments Q1(e) 2 mark The candidate s answer contains a sensible suggestion which is partly explained... (3 marks) 2 Turn over 29

32 Analysing results CONTROLLED ASSESSMENT IN DETAIL 5 comments 2 marks comments 2 marks Both axes are labelled correctly, and the mark guidance states that units are not essential. The shape of the line is appropriate. The candidate has recognised that case study 1 and case study 2 both support the hypothesis, and has realised that case study three is not appropriate. There is no recognition of the fact that there is some conflicting evidence or that one of the means has been incorrectly calculated. Overall, using a best fit approach, this answer is just worth 2 marks. 2 You have been given a Data Sheet which provides data from similar investigations. 2 (a) Draw a sketch graph of the results in Case Study 1. 4 The graph should show how the mean temperature rise varies with the mass of water being heated. 24 Temp rise Mass of water (2 marks) 2 (b) Does the data on the Data Sheet support the hypothesis you were given at the start of your investigation? To gain full marks you should use all of the appropriate data from Case Studies 1, 2, and 3 to explain the extent to which the data supports or contradicts the hypothesis. Case study 1 does cos it gives the same shape graph as mine. Case study 2 gives the same pattern as well. Case study 3 doesn t help cos they heated the water for different times... (3 marks). Do not write outside the box Q2(a) 2 Q2(b) 2 30

33 Analysing results 2 (c) Use Case Study 4 to answer this question. 5 What is the relationship between the specific heat capacity of a substance and the mean temperature rise of that substance? Explain how well the data supports your answer. Light oil has the highest specific heat but the smallest temp. rise. Brick has the lowest specific heat and the highest.... temp. rise. So the bigger the specific heat, the smaller the temperature rise. (3 marks) Do not write outside the box comments Q2(c) 1 mark 1 5 The candidate has correctly identified the pattern but has not quoted any numerical data to support this. CONTROLLED ASSESSMENT IN DETAIL 3 Think about the context that you were given for this investigation. How could the results of your investigation be useful in this context? You may use information from your A4 sheet of research notes to help you to answer this question. In a domestic hot water tank, the bigger the.... volume or mass of water you have, the smaller the temperature rise you will get when you heat it up. When you fill the kettle for a cup of tea you shouldn t put too much water in or it will take too long to boil. (3 marks) 4 Make sure that you hand in your A4 sheet of notes, results tables, and charts or graphs with this paper. You will be awarded up to four marks for your chart or graph. (4 marks) END OF QUESTIONS Copyright 2011 AQA and its licensors. All rights reserved comments Q4 Both axes are appropriately scaled and labelled. However there are two plotting errors but the line of best fit is suitable. comments Q3 2 marks The candidate has attempted to apply the results of the investigation to the context set by the teacher, and has also related this work to another context (boiling water in a kettle). 3 marks 31

34 6 Marking the ISA Marking Sections 1 and 2 of the ISA are marked internally, using the mark guidance supplied by AQA. This will be in two forms: generic guidance and more specific guidance for each Controlled Assessment. Marking should be done in red ink. Where necessary, annotations should be used to show the reasons for mark decisions. Full marking guidelines will be available on e-aqa. To access e-aqa, register at aqa.org.uk/eaqa-register Key points: Standardisation meetings will be run each year to assist in the application of the marking guidelines and to familiarise teachers with the process. Materials from these meetings will also be made available online. Each centre is assigned a Controlled Assessment Unit Adviser who will be able to give direct support on all aspects of the Controlled Assessments. 32

35 Step-by- Guide: Science B Controlled Assessment These Step-by- instructions are a guide for completing Controlled Assessment for: Science B To get started, choose a Controlled Assessment from the options on e-aqa. Teachers should then: Put the task into a context that will be suitable for their candidates to understand the reason for the investigation. Provide a hypothesis within the context for the candidates to investigate. Lead a discussion with the candidates to outline the technique that is to be used. This might include demonstrating the technique and illustrating the variety of equipment available. Candidates may need to practice the technique. Follow the s below on completing a Controlled Assessment. Planning and research (limited control) Candidates need to research the context of the investigation, to give an application for it. They need to identify the method they are going to use. They need to identify the hazards and risks associated with their investigation. Helpful hints: Candidates may use technology such as the internet or CD-ROMs for their research, textbooks, journals or any other appropriate sources of information. Candidates should decide for themselves factors such as the independent variable, the range, interval and number of repeat readings they should take. Candidates may bring the information they collect at this stage into the supervised sessions to use in preparing their final report. The planning stage should take one to two lessons, including the high control session used for the write-up. 1 Step-by- GUIDE ON COMPLETING A CONTROLLED ASSESSMENT 33