Separation methods

Question 1

Pure substance have

Answer 1

Definite and sharp boiling points and melting points

Question 2

Separation method to separate a solid from a liquid

Answer 2

1.Filtration (insoluble solids)
2.Crystallization (soluble solids but solubility changes with temperature)
3.Evaporation (soluble solid but solubility does not change with temperature)
4.Centrifugation (small particles from liquid)

Question 3

Separation method to separate mixtures of two solids

Answer 3

1.Handpicking or sieving
2.By using suitable solvent
3.Separation by sublimation
4.Magnetic separation
5.Gravity separation

Question 4

Filtration is used to separate

Answer 4

An insoluble solid from a liquid

Question 5

Crystallization is used to separate

Answer 5

a soluble solute from its solution

Soluble solutes tends to be less soluble at lower temperature (အေးသွားရင် အနည်ကျ)
Eg.CuSO4

Question 6

Evaporation is used to separate

Answer 6

Soluble solute from its solution

Temperature change ll solubility m change loh solvent akone lone ko evaporate loke
Eg.Salt

Question 7

Salt and sand is separated by

Answer 7

by using suitable solvent Eg.water dissolves salt but not sand

Question 8

Salt and sugar is separate by

Answer 8

using suitable solvent i.e.Ethanol that dissolves sugar but not salt

Question 9

Sand and iron is separated by

Answer 9

magnetic separation

Question 10

Simple distillation is used to separate

Answer 10

a solvent from a solution
Eg.Separation of water from salt solution

Question 11

Fractional distillation is used to separate

Answer 11

mixture of two liquids from each other
(By using their different boiling points)

Eg.ethanol and water

Question 12

Paper chromatography is used to separate

Answer 12

different substances(mixture of substance) from solution

*colored substances

Question 13

_______ is used in order to separate insoluble solid from liquid.

Answer 13

Fliteration

Question 14

_______ is used in order to separate soluble solid with solubilty changes with temperature.

Answer 14

Crystallization

Question 15

_______ is used in order to separate soluble solid with solubilty do not change significantly with temperature.

Answer 15

Evaporation

Question 16

_____ is used to seperate the two immiscible liquids.

Answer 16

Separating funnels

Question 17

______ is used to separate the two miscible liquids.

Answer 17

Fractional distillation (two miscible liquids with different boiling points)

Question 18

Chromatography is used to separate ______.

Answer 18

2 or more soluble solids

Question 19

Pure substance will produce________on paper chromatography.

Answer 19

Only one definite spot

Question 20

______ is used to separate two immiscible liquids but one is more heavier than other.

Answer 20

Decanting

Question 21

Emergent properties of compound

Answer 21

The properties of newly made compound is different from property of original substance

Question 22

Different amino acids are separated by _______.

Answer 22

Gel electrophoresis