Page 61 - Big Ideas Year 9 sciPAD 2025

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SCIPAD - BIG IDEAS - BOOK 1
THE NATURE OF MIXTURES
3. As part of your job for Silverback Scientific Industries, you are trying to develop a new stain-
removal liquid that is good at removing grass stains. The table below shows the results of
your investigation.
Solvent Grass stain Fabric
A Soluble Soluble
B Insoluble Soluble
C Soluble Insoluble
D Insoluble Insoluble
E Soluble Soluble
Describe the effect on both the stain and the fabric if you decided to use:
(a) Solvent A: 

(b) Solvent B: 

(c) Solvent C: 

4. The graph below shows the solubility of three salts at various temperatures.
0
0
25
50
100
150
50 75 100
Key
Potassium chloride
Sodium chloride
Sodium sulfate
Solubility of three salts at various temperatures
Temperature (°C)
Solubility (g/100g)
Which salt is the most soluble at:
(a) 0 °C? 
(b) 25 °C? 
(c) 100 °C? 
5. Use the word list to complete the paragraph.
concentrated - dilute - particles - solute
A solution contains a small amount of solute. When more
is added to the solution, it will become more
. A solution contains
more solute when compared to a dilute solution.
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