Separation of Mixtures

Question 1

Separation methods

Answer 1

• magnetic attraction
• filtration
• evaporation
• distillation
• paper chromatography

Question 2

Magnetic attraction

Answer 2

• used to separate magnetic materials from non-magnetic materials
• used in food processing and salvaging scrap iron and steel

Question 3

Filtration

Answer 3

• used to separate insoluble solids (residue after filtration) from solid-liquid mixtures
• filtered liquid is called filtrate

Question 4

Uses of filtration

Answer 4

• vacuum cleaners
• coffee makers
• water treatment

Question 5

Evaporation

Answer 5

• used to separate a dissolved solid from a solid-liquid mixture
• used to get salt from saltwater

Question 6

Distillation

Answer 6

-used to separate pure liquid (distillate) from solid-liquid or liquid-liquid mixtures

Question 7

Uses of distillation

Answer 7

• perfumes

- desalination

Question 8

Fractional distillation

Answer 8

• used to separate two or more liquids in a mixture of miscible liquids
• oil refineries use fractional distillation to separate crude oil into diesel, petrol and kerosene

Question 9

Paper chromatography

Answer 9

-used to separate small amounts of liquids
-works because different substances dissolve to different extents in a mixture
+used to separate mixtures of coloured substances

Question 10

Uses of paper chromatography

Answer 10

• to identify the contents of a mixture
• to test the purity of a liquid
• to find the dyes used in ink
• to find the dyes used in food