Separation and purification — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

4 The diagram shows the stages in testing a green leaf for starch. Which liquid is alcohol (methylated spirits)? liquid A liquid B liquid C liquid D leaf heat heat leaf

1 marks

Answer: B

This question in 0654/11 May/June 2005

20 Small amounts of barium nitrate and sand are shaken with separate samples of water in two test-tubes. The test-tubes are left to stand. Which two diagrams show the behaviour of the barium nitrate and sand? water A barium nitrate solution sand barium B nitrate sand solution solution water water C barium sand nitrate water D sand solution barium nitrate

1 marks

Answer: A

This question in 0654/11 May/June 2006

16 Which process would show that crude oil is a mixture? A combustion B cracking C fractional distillation D neutralisation

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2006

18 Which diagram shows how to separate glucose from a mixture of starch and glucose in water? A B mixture partially filter permeable paper membrane mixture distilled water C D electrodes mixture mixture heat

1 marks

Answer: B

This question in 0654/11 May/June 2007

23 The contents of a beaker scatter a beam of light. What does the beaker contain? A aqueous copper(II) sulfate B ethanol C milk D water

1 marks

Answer: C

This question in 0654/11 May/June 2010

14 Pure copper chloride can be obtained from a mixture of powdered copper and copper chloride. Three stages in the method are listed. P add water and stir Q crystallise R filter In which order should these stages be carried out to obtain pure copper chloride from the mixture? A P → Q → R B P → R → Q C Q → R → P D R → P → Q

1 marks

Answer: B

This question in 0654/12 May/June 2013

14 Small amounts of barium chloride and sand are shaken with separate samples of water in two test-tubes. The test-tubes are left to stand for 24 hours. Which diagram shows how the test-tubes appear at the end? A B water water barium sand chloride solution solution barium chloride sand C D water water sand barium solution chloride solution barium sand chloride

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2013

14 Small amounts of barium chloride and sand are shaken with separate samples of water in two test-tubes. The test-tubes are left to stand for 24 hours. Which diagram shows how the test-tubes appear at the end? A B water water barium sand chloride solution solution barium chloride sand C D water water sand barium solution chloride solution barium sand chloride

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2013

16 Water can be separated from copper sulfate solution using the apparatus shown. copper sulfate solution water What is the name of the process? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2014

14 Water can be separated from copper sulfate solution using the apparatus shown. copper sulfate solution water What is the name of the process? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2014

16 The diagram shows one of the steps needed to make drinking water. water in large pebbles and bricks gravel and pebbles sand water out Which method of separation is being used? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2014

20 Which processes are used to obtain crystals of sodium chloride from a mixture of sodium chloride and sand in water? first stage second stage A crystallise neutralise B evaporate filter C filter dissolve D filter evaporate

1 marks

Answer: D

This question in 0654/12 May/June 2015

15 Hexane and octane are liquid hydrocarbons that mix together. Which method is used to separate a mixture of these two liquids? A B C D xxxxxxxxx xxxxxxxxx heat heat

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2015

15 Hexane and octane are liquid hydrocarbons that mix together. Which method is used to separate a mixture of these two liquids? A B C D xxxxxxxxx xxxxxxxxx heat heat

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2015

14 Hexane and octane are liquid hydrocarbons that mix together. Which method is used to separate a mixture of these two liquids? A B C D xxxxxxxxx xxxxxxxxx heat heat

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2015

26 Which method is used to separate petroleum? A chromatography B distillation C filtration D fractional distillation

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2015

14 Which method of separation cannot be used to obtain a substance from each mixture? substance obtained from mixture method A different colours from an ink mixture chromatography B refinery gas from petroleum fractional distillation C salt from salty water filtration D water from ink distillation

1 marks

Answer: C

This question in 0654/12 May/June 2016

14 A student adds excess copper oxide powder to warm dilute sulfuric acid. Copper sulfate solution is formed. Which method is used to remove the unreacted copper oxide? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: D

This question in 0654/13 May/June 2016

19 Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium chloride. Which method is used to make the solution crystallise? A chromatography B evaporation C filtration D fractional distillation

1 marks

Answer: B

This question in 0654/13 May/June 2016

20 Copper sulfate is made when copper carbonate is added to dilute sulfuric acid. The copper carbonate is added until no more carbon dioxide is given off. The mixture is … 1 … to remove excess copper carbonate. The resulting solution is then … 2 … to decrease the volume. This solution is then … 3 … to allow the formation of pure copper sulfate crystals. Which words complete gaps 1, 2 and 3? 1 2 3 A boiled heated left to cool B filtered cooled left to cool C filtered heated evaporated to dryness D filtered heated left to cool

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2016

21 Copper(II) sulfate is made by adding an excess of solid copper(II) oxide to dilute sulfuric acid. reaction mixture unreacted copper(II) oxide What is the sequence of steps used to obtain copper(II) sulfate crystals from the reaction mixture? step 1 step 2 step 3 step 4 A evaporation crystallisation filtration evaporation B evaporation filtration crystallisation filtration C filtration crystallisation filtration evaporation D filtration evaporation crystallisation filtration

1 marks

Answer: D

This question in 0654/11 May/June 2017

15 An excess of a soluble salt is mixed with water. The mixture is filtered and the filtrate is distilled. Which row describes the filtrate and the distilled liquid? filtrate distilled liquid A solution solution B solution solvent C solvent solution D solvent solvent

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2017

15 Excess copper sulfate is mixed with water. The mixture is filtered and the filtrate is distilled. What are the colours of the solid left in the filter and the liquid collected after distillation? liquid collected solid after distillation A blue blue B blue colourless C colourless blue D colourless colourless

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2017

15 Which process is used to separate water from a salt solution? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2017

15 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2018

15 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2018

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

15 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2018

24 Why is filtration used in the purification of water? A to crystallise dissolved salts B to kill bacteria C to remove insoluble particles D to remove soluble substances

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2018

21 Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium chloride. Which method is used to make the solution crystallise? A chromatography B evaporation C filtration D fractional distillation

1 marks

Answer: B

This question in 0654/12 May/June 2019

21 Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium chloride. Which method is used to make the solution crystallise? A chromatography B evaporation C filtration D fractional distillation

1 marks

Answer: B

This question in 0654/13 May/June 2019

27 Petroleum is separated into useful fractions by fractional distillation. Which row matches the fractions to their uses? heating making fuel and cooking chemicals A bitumen naphtha refinery gas B gasoline bitumen naphtha C gasoline refinery gas naphtha D naphtha refinery gas gasoline

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2019

14 How is copper sulfate separated from aqueous copper sulfate? A chromatography B crystallisation C filtration D fractional distillation

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2019

20 Copper sulfate is made by adding an excess of copper carbonate to dilute sulfuric acid and stirring. The excess solid is removed. Most of the water is then removed. The solution is left for solid copper sulfate to form. In which order is apparatus used? A Bunsen burner, tripod and flask → filter funnel → crystallising dish B Bunsen burner, tripod and flask → crystallising dish → filter funnel C filter funnel → crystallising dish → Bunsen burner, tripod and flask D filter funnel → Bunsen burner, tripod and flask → crystallising dish

1 marks

Answer: D

This question in 0654/11 May/June 2020

15 A sample of water is contaminated with insoluble chalk and a soluble salt. Which two processes are used to separate the water from the chalk and salt? A distillation and chromatography B distillation and crystallisation C filtration and chromatography D filtration and crystallisation

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2020

15 An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then chromatography C filtration then crystallisation D filtration then chromatography

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2020

16 A mixture of solid sulfur and solid sodium chloride is added to water and stirred. Sulfur is insoluble in water. Sodium chloride is soluble in water. Which processes are used to obtain pure sodium chloride from the mixture? A distillation then chromatography B distillation then crystallisation C filtration then chromatography D filtration then crystallisation

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2020

15 Pure substance X has a melting point of 110 C. The melting point ranges of four impure samples of substance X are measured. What is the melting point range of the most impure sample of substance X? melting point / C A 81–85 B 86–92 C 98–99 D 102–110

1 marks

Answer: A

This question in 0654/11 May/June 2021

15 Which method can be used to separate graphite from dilute nitric acid? A chromatography B crystallisation C distillation D filtration

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 0654/12 May/June 2021

26 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0654/12 May/June 2021

15 Which method can be used to separate graphite from dilute nitric acid? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: D

This question in 0654/13 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

26 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0654/13 May/June 2021

14 A mixture contains solid P dissolved in liquid Q. Which process is used to obtain a pure sample of liquid Q from this mixture? A crystallisation B distillation C evaporation D paper chromatography

1 marks

Answer: B

This question in 0654/11 May/June 2022

14 A student adds excess copper oxide powder to warm dilute sulfuric acid. Aqueous copper sulfate is formed. Which method is used to remove the unreacted copper oxide? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: D

This question in 0654/12 Feb/March 2023

14 An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then chromatography C filtration then crystallisation D filtration then chromatography

1 marks

Answer: C

This question in 0654/11 May/June 2023

21 Magnesium chloride is prepared by reacting an excess of insoluble magnesium oxide with dilute hydrochloric acid. Which processes are used to obtain pure crystals of magnesium chloride from the reaction mixture? 1 distillation 2 evaporation 3 filtration A 1 followed by 2 B 3 followed by 2 C 3 followed by 1 D 1 followed by 3, followed by 2

1 marks

Answer: B

This question in 0654/11 May/June 2023

26 Petroleum is separated into fractions by fractional distillation. Information about uses of some fractions and positions in the fractionating column where they are collected is shown. fraction use position 1 gasoline making roads below refinery gas 2 bitumen petrol for car engines bottom of column 3 naphtha making chemicals below gasoline 4 refinery gas heating and cooking top of column Which rows are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0654/11 May/June 2023

14 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0654/12 May/June 2023

14 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0654/13 May/June 2023

26 Naphtha is obtained by the fractional distillation of petroleum. Which statements about naphtha are correct? 1 It burns to form carbon dioxide and water. 2 It is a mixture of hydrocarbons. 3 It is present in bottled gas. 4 The main component of naphtha is methane. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0654/13 May/June 2023

14 A sample of water contains two useful substances, insoluble chalk and a soluble salt. Which two processes are used to individually separate the insoluble chalk from the soluble salt and from the water? A distillation and chromatography B distillation and crystallisation C filtration and chromatography D filtration and crystallisation

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2023

26 Which process is used to separate petroleum into useful products? A cracking B filtration C fractional distillation D thermal decomposition

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2023

23 Copper sulfate is made when copper carbonate is added to dilute sulfuric acid. The copper carbonate is added until no more carbon dioxide is given off. The mixture is … 1 … to remove excess copper carbonate. The resulting solution is then … 2 … to decrease the volume. This solution is then … 3 … to allow the formation of pure copper sulfate crystals. Which words complete gaps 1, 2 and 3? 1 2 3 A boiled heated evaporated to dryness B filtered cooled left to cool C filtered heated evaporated to dryness D filtered heated left to cool

1 marks

Answer: D

This question in 0654/12 Feb/March 2025

24 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0654/12 May/June 2025

27 When aqueous copper(II) sulfate reacts with aqueous sodium hydroxide, a blue precipitate forms. Which method is used to remove the precipitate from the reaction mixture? A chromatography B distillation C filtration D crystallisation

1 marks

Answer: C

This question in 0654/12 May/June 2025

24 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0654/13 May/June 2025

27 When aqueous copper(II) sulfate reacts with aqueous sodium hydroxide, a blue precipitate forms. Which method is used to remove the precipitate from the reaction mixture? A chromatography B distillation C filtration D crystallisation

1 marks

Answer: C

This question in 0654/13 May/June 2025

25 Which process is used to obtain gasoline from petroleum? A crystallisation B chromatography C filtration D fractional distillation

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2025