Separation and Purification

Question 1

Pure substance definition.

Answer 1

one single element or compound, not mixed with any other substance

Question 2

Filtration used for what?

Answer 2

separate insoluble solid particles from a liquid

Question 3

Keywords for Filtration

Answer 3

Residue & Filtrate

Question 4

Evaporation to dryness used for what?

Answer 4

obtain soluble solid from a solution by heating the solution until all water has boiled off

Question 5

Crystallization used for what?

Answer 5

obtain PURE solid sample from solution

Question 6

SOLUTE and SOLVENT definition

Answer 6

solvent: the substance that dissolves the solute
solute: the substance that is dissolved

Question 7

Sublimation used for what?

Answer 7

separate solid that sublimes from one that does not

Question 8

Magnet used for what?

Answer 8

separate magnetic substance from a non-magnetic substance

Question 8

Simple distillation used for what

Answer 8

separate pure solvent from solution

Question 9

Chromatography used for what

Answer 9

separate 2 or more components that dissolve in same solvent
usually used in food colouring got poisoning

Question 10

Rf value how calculate?

Answer 10

[ Dist travelled by substance ]
_____________________________
[ Dist travelled by solvent ]

Question 11

Impact of impurities on M.pt and B.pt?

Answer 11

Boiling point: increase
Melting point: decrease

Question 12

Separating miscible liquids with diff boiling pts use what?

Answer 12

fractional distillation