Energy from Food ISA

1. Energy from Food ISA Worth 25%

2. What is an ISA? It is a controlled assessment worth 25% - it is the coursework aspect of your course

3. Stages of the ISA • Planning and research – all your information needs to be written on the candidate research form. • Reporting on the planning – this will be a 45 minutes test with a total mark of 20. You will need to come up with your results table at the end of this. • Practical work – this can be done individually or in small groups • Processing data – this is where you do your calculations and graphs • Analysing results – This is another test paper which will last 50 minutes and will give students a mark out of 30.

4. This controlled assessment • Energy from foods links in with what we have looked at on – ‘keeping healthy’ • We want you to learn how to • answer scientific questions • Be able to come up with methods to test hypotheses • Risk asses • Collect and analyse data • Draw conclusions • Evaluate your success in terms of method quality and result quality

5. Energy from Food ISA Worth 25%

6. Scenario • The NHS is worried about people gaining weight. We know we gain weight from eating food and then not using up the energy we take in. The NHS want you to do some research so see if: ‘The energy content of food depends upon the proportion of fat in the food’ • They want to be able to give people advice on what foods contain the most energy.

7. What do we know about food what are the food groups? Which ones gives us energy??!

8. Hypothesis ‘The energy content of food depends upon the proportion of fat in the food’ • You need to test this hypothesis • How could we test it?

9. Background Research. You will need to reference (name) two sources that you used for your research. One of these sources must be a method. Where could we find information to help us with this problem? Possible search questions: • Method for testing energy content in food • Is there a link between energy in food and amount of fat?

10. Background Research. These could be found in: • Textbook (Write the title of the book and the author(s)) • The internet. You need the full web address such as…. www.elisewallis/myfavourite/teacher You will need to write up your research on the ‘candidate research form’. You can gather the information in your books and then complete the form neatly. Extension: which of the two sources was the most useful and why

11. Task • You have 15 minutes to do some research and then we will feedback what we’ve found

12. Background Research – this needs to be written in your books You must explain which one of your sources of information is the most useful. You must comment on both, such as… Source 1 gave me a complete method of what to do. Source 2 gave me information about how solar cells work and what affects how much voltage they make.

13. From your background research you need to decide…. • How are you going to investigate the hypothesis? • What is your method going to be? • What equipment will you need? • What are your variables? • How are you going to make your test fair? • Are there any risks to your method?

14. Double check • Independent Variable • Dependent variables • Control Variables • Equipment List • Method Bullet pointed • What measurements will you take? • How will you make this a fair test • Risk associated with the practical • Preliminary table for your data

15. Double check – 25 mins • You have completed your sheet with hypothesis, sources of information and method on. • Can you say what a preliminary investigation is? • Can you explain your method with an equipment List • Name you variables : Independent Variable, Dependent variables and Control Variables • How will you make this a fair test • Risk associated with the practical • Why we might compare our results once completed • Preliminary table for your data (practice) • You may be assessed on your use of good English

16. Stage 2 Reporting on the planning (Section 1- 45minutes, 20 marks)

17. Stage 2 • You need to complete the test using their research notes. • Table of results – marked before the practical stage • Use full titles for table i.e. ‘Time taken for reaction to complete (s)’ not just ‘time (s)’

18. Stage 2 • I have marked section 1 of the ISA before you start the practical as I needed to know whether the students’ method is workable

19. Stage 3 Practical

20. Stage 3 • Any student who does not take part in the practical cannot be given any marks for section 2 of the ISA. • A new blank table • If you use a different method, you do not lose marks for section 1. • Remember to repeat any odd (anomalies) results

21. Stage 4 Processing data

22. Stage 4 • You now need to draw a graph of your data. • You get a mark out of 4 • Axis x appropriate scale and labels with units • Axis y appropriate scale and labels with units • Correct marking on of points • Good line of best fit • Practise now. Remember to decided what type of graph to draw

23. Stage 5 Section 2 test ( 50min – 30)

24. Homework • Use the How Science Works section at the start of either science textbook and your planning sheet for this experiment to answer and practices the questions on the following slides 25-27

25. What you need to know! • Can you name your variables for the experiment: • Independent • dependent • Control • Were there any problems with your experiment? Is it completely accurate? Does it measure every bit of energy in your food? • How could you improve your experiment to make sure it does?

26. What you need to know • Find out the meaning of these key words using the glossary at the back of your book. • Reliable • Reproducible • Repeatable • How do you deal with anomalies in an experiment • Do your results agree with your hypothesis (the energy content of food depends on the amount of fat in the food)? What evidence do you have to support your answer? Use your results to help you.

27. What you need to know • Why might people need to know how much energy different foods contain? Research and write the answer in your context box on your student research sheet. • How might your results be helpful to these people?

28. Stage 5 • Make sure you have read the teachers notes!!! • Students will need: • Research notes • Graph • Table of results • Secondary data sheets • Other students’ data (sometimes not always which is why it is important to read the teacher’s notes.)