Separation and purification — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

20 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 0973/21 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 0973/22 May/June 2019

26 Fractional distillation separates petroleum into useful fractions. Fraction L has a lower boiling point than fraction H. Which row describes the size of molecules and the attractive forces between molecules in fractions L and H? attractive forces size of molecules between molecules A L larger than H L greater than H B L larger than H L less than H C L smaller than H L less than H D L smaller than H L greater than H

1 marks

Answer: C

This question in 0973/22 May/June 2019

21 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 0973/21 May/June 2020

14 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 0973/21 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 0973/21 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 0973/22 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 0973/21 May/June 2022

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 0973/21 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 0973/22 May/June 2023

14 Sea water is heated in the apparatus shown. Y cold water in sea water X water out heat Which row describes changes at positions X and Y? at X at Y A concentration of solution decreases solvent condenses B concentration of solution decreases solute condenses C concentration of solution increases solvent condenses D concentration of solution increases solute condenses

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2024

14 Which graph shows the temperature change when an impure, solid substance is heated? A B temperature temperature time time C D temperature temperature time time

1 marks

Answer: A

This question in 0973/21 May/June 2025

24 A student prepares an insoluble salt by neutralising an acid with an alkali. Which method is used to separate the salt from the reaction mixture? A chromatography B distillation C evaporation D filtration

1 marks

Answer: D

This question in 0973/22 May/June 2025