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A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. (a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwa
A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats.
(a)
A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwarm’ and three other materials as shown below.
(b)
material A material B material C material D
She wrapped each beaker in a different material.She recorded the temperature at the start and 20 minutes later.
(i) What was the independent variable that the scientist changed? ...............................................................................................................
(ii) What was the dependent variable that the scientist measured during the investigation?
...............................................................................................................
The results of the investigation are shown below.
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time (minutes)
temperature of water (°C) wrapped in
material A
material B
material C
material D
0
60
60
60
60
20
34
40
38
36
(i) The scientist said that the ‘Wellwarm’ material is the best insulator. Which material was ‘Wellwarm’? Use the results to help you.Tick the correct box.
ABCD
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(ii) Use the evidence in the results table to explain your choice. ............................................................................................................... ...............................................................................................................
(c) The company made a coat from each of the four materials they tested.
A person tested the different coats by wearing each one in a cold room. He measured the temperature inside each coat for 30 minutes.
Write down two other variables that should be controlled to make this a fair test. 1. ....................................................................................................................
2. ....................................................................................................................
(d) Write down one thing the scientists should do to make sure the person testing the coats is safe.
........................................................................................................................
(e) Suggest one advantage of using a temperature sensor and data logger instead of a thermometer in this experiment.
........................................................................................................................ ........................................................................................................................
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