Separtaion Of Mixture

Question 1

State two things the student could do to make the salt dissolve quickly

Answer 1

Heat and stir

Question 2

State what the student should do next to separate the sand from the salt solution

Answer 2

Filter

Question 3

Explain why it’s nessacry for water to flow continuously in and out of the apparatus condenser in simple distillation

Answer 3

To cool so steam condenses

Question 4

Method separte sand from salt solution

Answer 4

Crystillastion

Question 5

Why can ethanol and water be separated by fractional distillation

Answer 5

Because of different boiling point

Question 6

Explain why the first liquid to be collected in the beaker is mostly ethanol in fractional distillation

Answer 6

Because ethanol has a lower boiling point

Question 7

Obtain pure water from sea water

Answer 7

Simple distillation

Question 8

Obtain ethanol from a mixture of ethanol and water

Answer 8

Fractional distillation

Question 9

Pure water from a solution

Answer 9

Simple distillation or fractional distillation

Question 10

Soluble solid from solution

Answer 10

Crystillastion

Question 11

Insoluble solid from liquid

Answer 11

Filtration

Question 12

Liquid from mixture of liquids with different boiling points

Answer 12

Fractional distillation

Question 13

Mixture of sand and water and want to obtain sand(insoluble)

Answer 13

Filtration

Question 14

Method used to separate the dyes in food colouring

Answer 14

Chromatography

Question 15

Explain why a is the least soluble

Answer 15

The spot closest to the start line travelled the least distance

Question 16

Equation of rf

Answer 16

Distance moved by solvent÷distance from base line

Question 17

Two students carry out separate chromatography experiments to find rf value for five different food dyes
State two things that should be the same in both experiments so the students can compare their results fairly

Answer 17

Same solvent
Same type of chromatography paper

Question 18

Describe how a student could obtain chromatography

Answer 18

Draw start line in pencil
Use same food colourings
Food colouring in startline
Mark solvent front

Question 19

Extract the red dye from a sample of rose petals

Answer 19

Dissolving

Question 20

Water from copper (II) sulfate solution

Answer 20

Sime distillation

Question 21

Method used to separate the solution of the green colouring from the remaining grass

Answer 21

Filtration

Question 22

State why the solvent level should not be above the base line at the start of the experiment

Answer 22

To prevent leaching

Question 23

Explain why people has largest no of dyes

Answer 23

Has largest nom of spots

Question 24

Matter

Answer 24

Can be classified by its chemical constitution into element,compound or mixture

Question 25

Element

Answer 25

Simplest form of matter that consists of similar atoms of the same type and can’t be divided into simpler substances by chemical methods

Question 26

Compound

Answer 26

Is a substance that results from the combination of two or different elements by chemical bond in fixed ratio and its properties are different from the element forming it

Question 27

Mixture

Answer 27

Composed of two or more substances which are mixed in different amounts by chemical bond in fixed ratio and its constituents can be separated by simple physical methods

Question 28

Homogeneous

Answer 28

Where all of its substances are completely mixed

Question 29

Heterogeneous

Answer 29

Where its substances are separated

Question 30

What usage of float

Answer 30

It’s used to separate two solid of densities

Question 31

Usage of melting and decanting in separation of mixture

Answer 31

It’s used to separate two solids of different melting point one of them of low melting point

Question 32

Mixture of solid solid mixture

Answer 32

Dissolving,floating,by using magnet,melting and decanting,sublimation

Question 33

Immiscibke liquid separated by what?
Oil and water

Answer 33

Separating funnel

Question 34

Miscible liquids like alcohol water mixture and crude oil

Answer 34

Fractional distillation

Question 35

Why use graphite in baseline

Answer 35

As its insoluble in any solvent