GCSE Chemistry practice questions on water and fertilisers. Try 3 for free below — with hints, the answer and why the wrong answers are tempting. GCSE Beast has 12 questions on this topic.
A hiker finds a few drops of a colourless liquid inside her waterproof bag. She wants to check whether the liquid contains water.
Which row shows a suitable test and the result if water is present?
| substance added to the liquid | colour change if water is present | |
|---|---|---|
| A | anhydrous copper(II) sulfate | blue to white |
| B | anhydrous copper(II) sulfate | white to blue |
| C | anhydrous cobalt(II) chloride | pink to blue |
| D | limewater | colourless to milky |
A town's water treatment works uses several stages to make river water safe to drink.
Which row shows a stage and its purpose correctly?
| stage | purpose | |
|---|---|---|
| A | filtration | kills microbes |
| B | carbon | removes tastes and odours |
| C | chlorination | removes solid particles |
| D | carbon | kills microbes |
Ammonium phosphate, , is used in some fertilisers.
What is the percentage by mass of nitrogen in ammonium phosphate? Use the Periodic Table.