Homework booklet
Year 8
Properties of materials
Q1. Use the terms given below to label the diagrams. Each term may be used once,
more than once or not at all.
A………………………………………………………………………………………………
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B………………………………………………………………………………………………
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C………………………………………………………………………………………………
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D………………………………………………………………………………………………
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E…………………………………………………………………………………………………
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Q2. Arun has a solution of copper sulfate labelled X.
Explain how he can make up a 100 cm3 solution of copper sulfate that is:
I.
II.
half as concentrated as solution X
-------------------------------------------------------------------------------------------------------------------a quarter as concentrated as solution X
III.
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half as concentrated as the solution in part b
IV.
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What steps can Arun take to ensure that his solutions are made up as accurately as
possible?
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Q3. Arun and Marcus are asked to compare the solubility of two salts in water at
room temperature. The two salts are labelled X and Y.
i.
Name the independent variable in the investigation.
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ii.
Name the dependent variable in the investigation.
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iii.
List the control variables in the investigation.
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Q4. Two students carried out an experiment to investigate the effect of temperature on
the solubility of salt and sugar. The results are presented in the graph below.
a) At 20°C, how many grams of sugar dissolved in 100ml of water?
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b) How does temperature affect the solubility of sugar? Explain your answer using data
from the graph.
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c) State the main differences between the solubility of sugar and salt as there is an
increase in temperature.
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d) Identify the following in the experiment:
e) independent variable__________________________________________
f)
independent variable _________________________________________
g) control variables______________________________________________