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Controlled Assessment REVISION

Controlled Assessment REVISION. Homework. Hypothesis The time taken for a mixture of oil, water and emulsifier to separate depends on the volume of the emulsifier in the mixture. Practice writing out your method at home. Use this checklist to help you: You should include:

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Controlled Assessment REVISION

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  1. Controlled Assessment REVISION

  2. Homework Hypothesis The time taken for a mixture of oil, water and emulsifier to separate depends on the volume of the emulsifier in the mixture. • Practice writing out your method at home. Use this checklist to help you: • 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. • Spelling, punctuation, grammar, clarity of thought.

  3. Controlled Assessment Hypothesis The time taken for a mixture of oil, water and emulsifier to separate depends on the volume of the emulsifier in the mixture. Preliminary experiment to determine a value for a control variable. Variables. Equipment. Key things you need to know Why sharing your results with others is an advantage. Method suited to the hypothesis. Why you chose a particular source. Risk assessment. How to draw a suitable table.

  4. Hypothesis The time taken for a mixture of oil, water and emulsifier to separate depends on the volume of the emulsifier in the mixture. • Think pair share • Without looking at your notes, tell your partner the following about the experiment you have chosen to investigate the hypothesis: • Variables – independent, dependent, control. • How you will do a preliminary investigation to determine the value of one of your control variables. • The equipment you will use. • How you will do the experiment ( step by step). • Risk assessment – what are the risks? How are they dangerous? How will you control for them? • How you design a table to record your results. • Why you chose the source that you did ( think about reliability of the source, usefulness of the method). • Why it is an advantage to share your results.

  5. To do: Hypothesis The time taken for a mixture of oil, water and emulsifier to separate depends on the volume of the emulsifier in the mixture. • Practice writing out key information about your method. Use this checklist to help you: [Total marks = 9] • 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. • Spelling, punctuation, grammar, clarity of thought. Mark a minute- 9MINUTES!

  6. Self assess: Method [9] You have listed all major equipment. [1] Your method is clear enough for someone else to follow and get similar results.[2] You have stated which measurements you will make ( e.g. 5cm3 of oil/water, shake for 5 seconds….etc). [1] You have also mentioned the important control variables and how you will control them. [1] You have identified significant hazards, said how they are dangerous and how you will control the risk. [2] Your answer is coherentwith a logical sequence and you have used keywords ( emulsion, emulsifier, hypothesis, independent/dependent/control variable). [1] Your answer has almost faultless spelling, punctuation and grammar. [1]

  7. Designing a table: Self assess You have labelled your variables( headings) and give their units e.g. time in seconds, volume in cm3 [1] You have shown some indication of the measurements you will take for the independent variable. [1]

  8. To do: Answer the following questions: Identify the different variables in your experiment. Which source did you choose to use and why? ( compare and contrast the usefulness of both sources). Why is it an advantage to share your results with other groups ( think of 3 points). How will you conduct a preliminary investigation to find a suitable value for a control variable?

  9. Advantages of sharing results Enables you to compare results with others to see similarities and differences in trends. More results enable you to calculate a more accurate mean and minimise the effect of random errors. It enables you to see if your experiment is reproducible.

  10. Key points • Sources – write down the two sources you researched ( title, author/ name of website). • To justify why you chose a particular source you have to compare and contrast both sources and give the advantage of the one you chose . • Preliminary investigation ( 3 points): • state the control variable you will be focussing on. • State the limits of the range you will investigate (e.g. 5cm3 and 10cm3 of oil). • Say how your results can help you determine the best value for this variable. • Method [9 marks] – equipment, coherent logical method, risk assessment, spelling, grammar, punctuation. • Sharing results ( 3 points) : • Enables you to compare results with others to see similarities and differences in trends. • More results enable you to calculate a more accurate mean and minimise the effect of random errors. • It enables you to see if your experiment is reproducible. • Table of results – headings/labels, units, measurements for independent variable.

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