Chemistry Term 1 Test

Question 1

Magnetic attraction

Answer 1

a magnet can be used to seperate man=gnetic solids from non-magnetic ones

Question 2

sieving

Answer 2

a sieve can be used to seperte solids of different particle size

Question 3

using suitable solvents

Answer 3

a suitbale solevent can be used to seperate a solid-solid mixture where only 1 solid is soluble in the solvent

solvent - liquid that dissolves solids (greater quantity)

solute - solids that dissolves in solvent (smaller quantity)

Question 4

Sublimation

Answer 4

can be used to seperate substance that changes fron solid to gases directly

Question 5

Filtration

Answer 5

can be used to seperate insoluble solids from liquids

in filter funnel - residue
in beaker - filtrate

Question 6

evaporation to dryness

Answer 6

evaporation to dryness is used to separate a dissolved solid from its solvent by heating the mixture untill all the solvent has vaporised

solvent - liquid that dissolves solids (greater quantity)

solute - solids that dissolves in solvent (smaller quantity)

Question 7

Crystalisation

Answer 7

used to obtain a pure solid from its saturated solution

saturate solution - one in which no more solute can be dissolved

if a solute decomposes of breaks frown into simpler substances when heated crystalisation is used

Question 8

Simple distillation

Answer 8

used to separate a pure solvent from a solution

Question 9

Miscible liquids

Answer 9

forms a homogenous solution when mixed tgt

Question 10

imMiscible liquids

Answer 10

hetergenous mixture of 2 or more imMiscible liquids

can separate into layers known as phases when left to rest

Question 11

separating funnel

Answer 11

used to separate immisible liquids

Question 12

chromatography

Answer 12

used to seprate a mixture of substances on the paper after chromatgraphy

pencil is used as it is insoluble in the solvent

Rf value -> distance travelled by substance/ distance travelled by solvent

Question 13

Fractional distilation

Answer 13

used to seperate miscible liquids with different boiling points

a fractionating column which contains glass beads.small solids ewbich produce larger ESA for the vapor to condesnse on is added

Question 14

Fractional distilation industrail application

Answer 14

oil refineries separate different substances from crude oil

liquified air is sepratayed to produce nitrogen, oxygen and argon gas