Water — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

19 Soap solution is gradually added to separate samples of water P, Q, R and S until a lather forms. P Q R S distilled boiled distilled hard tap boiled hard water water water tap water How does boiling affect the volume of soap solution needed for a lather? P to Q R to S A no change no change B no change S needs less C Q needs more no change D Q needs more S needs less

1 marks

Answer: B

This question in 0654/11 May/June 2005

21 A sample of tap water forms a scum, rather than a lather, with soap solution. This shows that the tap water is …X… and that it contains …Y… ions. What are X and Y? X Y A hard calcium B hard sodium C soft calcium D soft sodium

1 marks

Answer: A

This question in 0654/11 May/June 2006

20 When some hard water is boiled in a kettle, a white scale forms inside the kettle. Which two of the following statements are correct? 1 The hard water contains dissolved calcium carbonate. 2 The hard water contains dissolved calcium hydrogencarbonate. 3 The white scale contains calcium carbonate. 4 The white scale contains calcium hydrogencarbonate. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2006

25 Water is used to put out forest fires by spraying it on to the fire from aeroplanes. Why is water used for this purpose? A Water boils at 100 °C. B Water cools the fire. C Water is a good solvent. D Water is a reducing agent.

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2006

26 In which form do plants receive essential elements from fertilisers? A atoms B carbohydrates C ions D proteins

1 marks

Answer: C

This question in 0654/11 May/June 2007

22 Soap solution is gradually added to separate samples of water P, Q, R and S until a lather forms. P Q R S distilled boiled distilled hard tap boiled hard water water water tap water How does boiling affect the volume of soap solution needed for a lather? P → Q R → S A no change S needs less B no change S needs more C Q needs more S needs less D Q needs more S needs more

1 marks

Answer: A

This question in 0654/11 May/June 2008

22 Tap water often contains compounds dissolved from rocks. The list shows four minerals present in rocks. 1 gypsum, CaSO4 2 magnesite, MgCO3 3 rock salt, NaCl 4 quartz, SiO2 Which of these minerals cause hardness in tap water? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 2 and 4 only

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2008

20 The diagram shows an experiment to test the hardness of separate samples of distilled water, tap water and boiled tap water. teat pipette soap solution 25 cm3 of the water being tested Soap solution is added, shaking after each drop, until a lather is formed. Which results could be correct? number of drops of soap solution used distilled water tap water boiled tap water A 2 5 10 B 2 10 5 C 5 10 2 D 10 5 2

1 marks

Answer: B

This question in 0654/11 May/June 2009

20 Tests on some 10 cm3 samples of tap water give the following results. test result add 2 cm3 of soap solution and shake no lather boil the tap water, add 2 cm3 of soap solution and shake lather add acidified aqueous barium nitrate white precipitate What do the results show about the tap water? A It is hard and contains chloride ions. B It is hard and contains sulfate ions. C It is soft and contains chloride ions. D It is soft and contains sulfate ions.

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2009

22 What is released from rocks during weathering to help plants grow? A calcium hydroxide B nitrogen gas C soluble salts D sodium chloride

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2009

20 During the weathering of rocks, which process does not take place? A chemical change B fixation of nitrogen C physical change D release of salts into the soil

1 marks

Answer: B

This question in 0654/11 May/June 2010

25 Fertilisers are used to supply the essential elements needed for plant growth. Which compound supplies two of these essential elements? A Ca(H2PO4)2 B Ca(NO3)2 C KNO3 D (NH4)2SO4

1 marks

Answer: C

This question in 0654/12 May/June 2012

25 Fertilisers are used to supply the essential elements needed for plant growth. Which compound supplies two of these essential elements? A Ca(H2PO4)2 B Ca(NO3)2 C KNO3 D (NH4)2SO4

1 marks

Answer: C

This question in 0654/13 May/June 2012

26 What is limestone? A calcium carbonate B calcium chloride C calcium hydroxide D calcium oxide

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2015

25 Four solutions are tested with Universal Indicator paper and with anhydrous copper(II) sulfate. Which row shows the observations for pure water? Universal Indicator paper anhydrous copper(II) sulfate A turns blue turns blue B turns blue turns white C turns green turns blue D turns green turns white

1 marks

Answer: C

This question in 0654/11 May/June 2017

25 Which row shows a chemical test for the presence of water? substance colour change A anhydrous cobalt(II) chloride pink to blue B anhydrous cobalt(II) chloride white to blue C anhydrous copper(II) sulfate pink to blue D anhydrous copper(II) sulfate white to blue

1 marks

Answer: D

This question in 0654/13 May/June 2017

24 Water is purified by chlorination and filtration. Which statement is correct? A Chlorination destroys microbes and filtration removes insoluble particles. B Chlorination destroys microbes and filtration removes soluble particles. C Chlorination removes insoluble particles and filtration destroys microbes. D Chlorination removes insoluble particles and filtration removes soluble particles.

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2018

25 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purification of water D treating acidic soil

1 marks

Answer: C

This question in 0654/12 May/June 2019

25 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purification of water D treating acidic soil

1 marks

Answer: C

This question in 0654/13 May/June 2019

25 Which three elements are needed in fertilisers to help plants grow? A nitrogen, phosphorus, potassium B nitrogen, phosphorus, sodium C nitrogen, sodium, potassium D sodium, phosphorus, potassium

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2019

24 Why do farmers treat their fields with fertilisers? A to decrease the acidity of the soil B to increase the oxygen content of the soil C to increase the water content of the soil D to increase the yield of crops

1 marks

Answer: D

This question in 0654/11 May/June 2020

24 Which statement about fertilisers is correct? A They are fed to animals to improve the animals’ growth. B They contain only nitrogen, phosphorus and potassium as elements. C They increase plant growth by adding chemicals directly to plant flowers. D They increase plant growth by adding chemicals to the soil.

1 marks

Answer: D

This question in 0654/12 May/June 2020

23 Which three elements are contained in fertilisers to increase crop yield? A calcium, nitrogen, phosphorus B calcium, nitrogen, potassium C calcium, phosphorus, potassium D nitrogen, phosphorus, potassium

1 marks

Answer: D

This question in 0654/13 May/June 2020

24 Why is chlorine used in the treatment of water supplies? A to bleach water B to kill bacteria C to remove insoluble compounds D to remove soluble compounds

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2020

24 Both anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used as chemical tests for water. Which row describes the effect of water on the colour of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate? anhydrous anhydrous cobalt(II) chloride copper(II) sulfate A blue to pink blue to white B blue to pink white to blue C pink to blue blue to white D pink to blue white to blue

1 marks

Answer: B

This question in 0654/12 Feb/March 2021

24 Other than hydrogen and oxygen, which substance provides only one of the essential elements for plant growth? A K3PO4 B KNO3 C (NH4)3PO4 D NH4NO3

1 marks

Answer: D

This question in 0654/11 May/June 2021

23 In order to make water from reservoirs fit to drink … 1 … is used to kill bacteria. Water in a condenser is used during distillation as a … 2 … . When water is used to make ethanol from ethene it is acting as a … 3 … . Which words correctly complete gaps 1, 2 and 3? 1 2 3 A chlorination coolant reactant B chlorination solvent solvent C filtration coolant reactant D filtration solvent solvent

1 marks

Answer: A

This question in 0654/12 May/June 2021

24 Other than hydrogen and oxygen, which substance provides only one of the essential elements for plant growth? A K3PO4 B KNO3 C (NH4)3PO4 D NH4NO3

1 marks

Answer: D

This question in 0654/12 May/June 2021

23 In order to make water from reservoirs fit to drink … 1 … is used to kill bacteria. Water in a condenser is used during distillation as a … 2 … . When water is used to make ethanol from ethene it is acting as a … 3 … . Which words correctly complete gaps 1, 2 and 3? 1 2 3 A chlorination coolant reactant B chlorination solvent solvent C filtration coolant reactant D filtration solvent solvent

1 marks

Answer: A

This question in 0654/13 May/June 2021

23 What is the colour of cobalt(II) chloride after water is added to it? A blue B pink C white D green

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2021

23 Which colour is observed when water is added to anhydrous copper(II) sulfate? A blue B green C pink D white

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2021

23 What is a chemical test for water? A It turns anhydrous cobalt(II) chloride white. B It turns anhydrous copper(II) sulfate blue. C It turns blue copper(II) sulfate white. D It turns pink cobalt(II) chloride blue.

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2021

24 Anhydrous cobalt(II) chloride changes colour when water is added. Which row shows the colour before and after water is added? before after A blue pink B blue white C white blue D white pink

1 marks

Answer: A

This question in 0654/12 Feb/March 2022

25 Which statement about the treatment of the water supply is correct? A Chlorination is used to improve the taste of the water. B Chlorination is used to kill bacteria. C Filtration is used to adjust the pH of the water. D Filtration is used to remove soluble impurities.

1 marks

Answer: B

This question in 0654/11 May/June 2022

25 Which colour change is observed when water is tested using copper(II) sulfate? A blue  pink B blue  white C white  blue D white  pink

1 marks

Answer: C

This question in 0654/12 May/June 2022

25 Which colour change is observed when water is tested using copper(II) sulfate? A blue  pink B blue  white C white  blue D white  pink

1 marks

Answer: C

This question in 0654/13 May/June 2022

25 Water is tested with white copper(II) sulfate powder and with blue cobalt(II) chloride paper. Which row shows the results of the tests? copper(II) sulfate cobalt(II) chloride A turns blue stays blue B turns blue turns pink C stays white turns pink D stays white stays blue

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2022

26 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purifying water D treating acidic soil

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2022

26 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purifying water D treating acidic soil

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2022

25 Four watch-glasses contain solid salts as shown. blue white blue pink copper(II) sulfate copper(II) sulfate cobalt(II) chloride cobalt(II) chloride Water is added to each salt. Which statement describes the salt solutions that form? A They are blue or pink only. B They are white or blue only. C They are all pink. D They are all blue.

1 marks

Answer: A

This question in 0654/12 Feb/March 2023

23 Which statement describes a chemical test for water? A Add blue cobalt(II) chloride. B Add blue copper(II) sulfate. C Measure the boiling point. D Use universal indicator.

1 marks

Answer: A

This question in 0654/11 May/June 2023

23 Which statement about the treatment of the water supply is correct? A Water from reservoirs and rivers is filtered to remove dissolved impurities. B Chlorine is added to the water to kill bacteria. C Sodium chloride is added to the water to make it pleasant to drink. D Chlorine is added to make the water pure.

1 marks

Answer: B

This question in 0654/12 May/June 2023

23 Which statement about the treatment of the water supply is correct? A Water from reservoirs and rivers is filtered to remove dissolved impurities. B Chlorine is added to the water to kill bacteria. C Sodium chloride is added to the water to make it pleasant to drink. D Chlorine is added to make the water pure.

1 marks

Answer: B

This question in 0654/13 May/June 2023

25 Which colours are observed when water is added to white copper(II) sulfate and to blue cobalt(II) chloride? copper(II) sulfate cobalt(II) chloride A white pink B white white C blue pink D blue white

1 marks

Answer: C

This question in 0654/12 Feb/March 2024

26 A colourless liquid is tested with blue cobalt(II) chloride paper. The blue paper turns pink. What does this test prove that the liquid contains? A an acid B an alkali C ethanol D water

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2024

26 Sodium chloride is dissolved in water. stirrer water sodium chloride Which word describes the water used in this process? A solvent B solution C solute D sediment

1 marks

Answer: A

This question in 0654/12 Feb/March 2025

23 Four liquids are tested with universal indicator and with anhydrous copper(II) sulfate. Which row shows the observations for pure water? anhydrous universal indicator copper(II) sulfate A turns blue turns blue B turns blue turns white C turns green turns blue D turns green turns white

1 marks

Answer: C

This question in 0654/11 May/June 2025

22 Which row shows the colour of copper(II) sulfate and of cobalt(II) chloride when they are added to water? copper(II) sulfate cobalt(II) chloride A blue blue B blue pink C white blue D white pink

1 marks

Answer: B

This question in 0654/13 May/June 2025