Cambridge IGCSE · Chemistry (0620)

Water: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Water.

10 questions24 marksFree, no account

Question 1

1 mark

Which substance is used in a chemical test to show the presence of water?

Question 2

1 mark

In the treatment of domestic water, what is the purpose of filtration?

Question 3

1 mark

The table identifies some substances found in natural water and their potential effects. Which row is correct?

Question 4

1 mark

Natural water sources can contain various substances. Why are some metal compounds considered potentially harmful to humans?

Question 5

1 mark

Which substance found in natural water sources is beneficial to aquatic life?

Question 6

2 marks

Describe the color change observed when water is added to a sample of anhydrous copper(II) sulfate.

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

What is the specific purpose of the chlorination step in the treatment of the domestic water supply?

Write your answer out first, then check it against the worked solution.

Question 8

5 marks

Identify and distinguish between the two physical processes used to remove insoluble solids during domestic water treatment.

Write your answer out first, then check it against the worked solution.

Question 9

4 marks

A student is given a colorless liquid and asked to perform chemical tests to confirm if it is water and if it is pure water.
(a) Describe a chemical test using anhydrous copper(II) sulfate to show the presence of water, including the observation for a positive result.
(b) Describe how the student can use the boiling point of the liquid to determine if the water is pure.

Write your answer out first, then check it against the worked solution.

Question 10

5 marks

The domestic water supply undergoes several stages of treatment before it is safe for human consumption.
(a) Explain the purpose of sedimentation and filtration in the treatment process.
(b) Why is chlorine added to the water at the end of the treatment?
(c) What is the purpose of using carbon (charcoal) during water treatment?

Write your answer out first, then check it against the worked solution.

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, marked as you go.