17 AND SOLUBILITY ACTIVITY 1: REVISION QUESTIONS


SOLUTIONS


1 When 100 g water and 5 g of coffee powder are added together on a balance, what should the balance read?


2 What is difficult to control when investigating the relationship between solubility and temperature?


3 Your science teacher presents you with an unknown white powder in the laboratory. Outline any investigations and research you can carry out to identify the substance.


4 Pure alcohol boils at 74°C. However, you have found the boiling point of the alcohol in the lab to be 79°C. Explain the reason for the difference.


5 Draw a number line to show what states milk would be in at different temperatures. Assume the freezing point and boiling point of milk to be –0.5°C and 102°C, respectively.


UNIT 4: SUBSTANCES


81


CHEMICAL WORLD


c


h


a


p


t


e


r


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