Look at the results of the investigation and answer the questions below:   Oven temperature Temperature after 20 minutes Potato temperature after 40 minutes   Potato wrapped in nothing 200⁰C 85⁰C 54⁰C 55⁰C Potato wrapped in tin foil 200⁰C 91⁰C 82⁰C 71⁰C Potato wrapped in newspaper 200⁰C 92⁰C 84⁰C 76⁰C Potato wrapped in cotton wool 200⁰C 96⁰C 92⁰C 88⁰C

Question 2.1   I have a mixture of salty water, fine sand and gravel. If I didn’t want to keep the water at the end, what three steps would I take to separate them and in what order? Copy and complete the table to show what you would do:   What process would I carry out? What special equipment would I need? What would this remove? 1st step: 2nd step: 3rd step:     Upload Image Here (3)

Question 3.4   Why did the group decided to test a potato with nothing wrapped around it? (1)

Question 2.2   Choose which changes are reversible or irreversible regarding the following mixtures: Mixtures: Reversible or Irreversible: Frying an egg Melting chocolate Dissolving salt in water Making bread into toast Freezing water to make ice Mixing vinegar and bicarbonate of soda Burning wood Water turning into steam (4)

BIBLIOGRAPHY: 1. Twinkl URL – www.twinkl.co.za  

QUESTION 3 Answer the following questions regarding an investigation:

Question 3.5.1   What would the title of the last column be? (1)

Question 3.6   Which material would you use to wrap the jacket potato? Give a reason for your answer. (2)

Read the following passage and answer the question about the investigation: A group of children wanted to design a container to keep a jacket potato warm. They needed to test which material would be the best insulator.   They decided to wrap warm jacket potatoes in different materials to see which kept the potato the warmest for the longest time.

Question 1.5.2   List two properties of each of the following materials which make them good for these jobs.   Glass used for a greenhouse. (1)