Water past paper questions

O Level Chemistry 5070 · Chemistry of the environment. 1 Describe chemical tests for the presence of water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate 2 Describe how to test for the purity of water using melting point and boiling point 3 Explain that distilled water is used in practical chemistry rather than tap water because it contains fewer chemical impurities 4 State that water from natural sources may contain substances, including: (a) dissolved oxygen (b) metal compounds (c) plastics (d) sewage (e) harmful microbes (f) nitrates from fertilisers (g) phosphates from fertilisers and detergents 5 State that some of these substances are beneficial, including: (a) dissolved oxygen for aquatic life (b) some metal compounds provide essential minerals for life 6 State that some of these substances are potentially harmful, including: (a) some metal compounds are toxic (b) some plastics harm aquatic life (c) sewage contai

In Cambridge O Level Chemistry 5070, Water came up in 33 of the 72 papers on Paperstreak, for about 1 marks a paper when it does. It last came up in October/November 2025.

Often set with Ion and ionic bonds, The mole and the Avogadro constant, Formulae, Preparation of salts.

35 questions, newest first

5070/11/O/N/25 Question 28 · 1 mark
5070/12/O/N/25 Question 28 · 1 mark
5070/21/O/N/25 Question 9 part (b) · 1 mark
5070/22/O/N/25 Question 10 · 7 marks
5070/11/M/J/25 Question 29 · 1 mark
5070/12/M/J/25 Question 29 · 1 mark
5070/42/M/J/25 Question 2 part (a) · 1 mark
5070/11/O/N/24 Question 28 · 1 mark
5070/12/O/N/24 Question 39 · 1 mark
5070/21/O/N/24 Question 1 part (a(iv)) · 1 mark
5070/12/M/J/24 Question 30 · 1 mark
5070/21/M/J/24 Question 1 part (d) · 1 mark
5070/22/M/J/24 Question 1 parts (c) (d) · 2 marks
5070/11/O/N/23 Question 30 · 1 mark
5070/12/O/N/23 Question 30 · 1 mark
5070/21/O/N/23 Question 1 part (b) · 1 mark
5070/22/O/N/23 Question 1 part (b) · 1 mark
5070/11/M/J/23 Question 30 · 1 mark
5070/11/M/J/23 Question 31 · 1 mark
5070/12/M/J/23 Question 32 · 1 mark
5070/21/M/J/23 Question 1 part (e) · 1 mark
5070/11/O/N/22 Question 35 · 1 mark
5070/12/O/N/22 Question 35 · 1 mark
5070/22/O/N/22 Question 2 part (a(ii)) · 1 mark
5070/21/M/J/22 Question 9 parts (c(i)) (c(ii)) · 2 marks
5070/22/M/J/22 Question 10 parts (c(i)) (c(ii)) · 4 marks
5070/12/O/N/21 Question 35 · 1 mark
5070/21/O/N/21 Question 9 part (e) · 3 marks
5070/11/O/N/20 Question 33 · 1 mark
5070/12/O/N/20 Question 33 · 1 mark
5070/21/O/N/20 Question 4 part (b(iii)) · 1 mark
5070/22/O/N/20 Question 1 part (b) · 1 mark
5070/22/O/N/20 Question 4 part (a) · 1 mark
5070/11/M/J/20 Question 32 · 1 mark
5070/12/M/J/20 Question 32 · 1 mark

More in Chemistry of the environment: Fertilisers, Air quality and climate.

Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.