1.3

Question 1

Magnetic attraction

Answer 1

Separate solid-solid substances
Used to separate magnetic substances

Question 2

By adding a suitable solvent and filtration

Answer 2

Two solid one soluble one residue
1. Add suitable solvent to dissolve
2. Stir
3. Filtrate
4. Evaporate to dryness

Question 3

Filtration

Answer 3

Separate insoluble solid from liquid in a suspension
Filter funnel
Filter paper

Question 4

Evaporation to dryness

Answer 4

Separate soluble solid from solution by heating until all water boiled off
Substance must have
- high boiling/melting point
- stable to heat; cannot decompose
( sugar decompose on heating )

Question 5

sieving

Answer 5

separate solids with different particle sizes
- pore size

Question 6

crystallisation

Answer 6

Obtain pure solid from its saturated solution.
No more solute can be dissolved.

Question 7

separating solid-solid mixtures

Answer 7

magnetic attraction, sieving, using suitable solvents

Question 8

using suitable solvents

Answer 8

separate solid-solid mixtures, only one solid is soluble in the solvent

Question 9

separating solid liquid mixtures

Answer 9

filtration, evaporation to dryness, crystallisation, simple distillation

Question 10

simple distillation

Answer 10

separate pure solvent from solution

Question 11

chromatography

Answer 11

separate a mixture of substances with different solubilities in a solvent

Question 12

chromatograms

Answer 12

show the separated substances on the paper after chromatography

Question 13

applications of chromatography

Answer 13

separate components like dna fragments

Question 14

fractional distillation

Answer 14

separate miscible liquids w diff boiling points ( not large diff)

Question 15

applications of fractional distillation

Answer 15

oil refineries

Question 16

noble gas electronic configuration

Answer 16

when all noble gases have full valence electron shells