Separation And Solubility

Question 0

How do you know when the liquid is insoluble

Answer 0

None of the solid particles will dissolve, the solid will remain at the bottom as a sediment or floating in the liquid as suspension and (due to suspension) the liquid is opaque

Question 1

How do you know if the solid is soluble

Answer 1

All of the solid has dissolved and/or the liquid is transparent

Question 2

What does solution mean

Answer 2

When a solute and solvent are mixed together all the liquid is transparent and all the solid has dissolved

Question 3

What does sediment mean

Answer 3

When there are solid particles at the bottom of the test tube

Question 4

What does suspension mean

Answer 4

Solid particles that are floating (suspended) in the liquid

Question 5

When particles dissolve the solid is…

Answer 5

Soluble

Question 6

When particles do not dissolve the solid is…

Answer 6

Insoluble

Question 7

What is a solution made from

Answer 7

A soluble solute that dissolves in a solvent

Question 8

What is a solute

Answer 8

A solid that will dissolve in a solvent

Question 9

What is a solvent

Answer 9

A liquid

Question 10

What happens when an insoluble solid is mixed with water

Answer 10

The water goes cloudy

Question 11

What is the most common solvent

Why

Answer 11

Water

It is easily available, cheap and dissolves a lot of different solutes

Question 12

What other liquids can be used as solvents

Answer 12

White spirits and ethanol

Question 13

Solute which are insoluble in water may dissolve in other solvents is this true or false

Answer 13

True

Question 14

What is a saturated solution

Answer 14

The point where no more solute will dissolve

Question 15

How do u make more solid dissolve

Answer 15

By adding more solvent e.g. water or increasing the temperature

Question 16

What word should we use to describe a clear solution

Answer 16

Colourless

Question 17

Give 2 examples of an insoluble solid

Answer 17

Chalk

Wood

Question 18

Give 2 examples of a soluble solid

Answer 18

Salt

Sugar

Question 19

Is orange squash a solvent a solute or a solution

Answer 19

Solution

Question 20

What does dissolve mean

Answer 20

When the solute breaks apart to form a solution

Question 21

What are the particles in salt like

Answer 21

Held together in a fixed shape

Question 22

The particles in water can move around

True or false

Answer 22

True

Question 23

Rock is soluble

True or false

Answer 23

False

Question 24

When the salt particles dissolve are they still in a fixed shape

Answer 24

No they mix with the water particles to form a solution

Question 25

10g of salt + 100g of water would have made the mass of the solution...

Answer 25

110g

Question 26

If you dissolve 20g of salt in 100g of water the mass of the solution would be...

Answer 26

120g

Question 27

What can you use to separate sand from salty water

Answer 27

Filter paper

Question 28

When you use filter paper the method is called...

Answer 28

Filtration

Question 29

How does filtration/separation of sand from salty water work

Answer 29

The sand grains are to big to fit through the tiny holes in the filter paper but the paper will not trap the particles of salt as they are very small. Both the sand and water will get through and is deposited in the tray below where as the sand is trapped in the paper lining the funnel

Question 30

What is a mixture

Answer 30

More than one substance in a container

Question 31

Give an example of a mixture

Answer 31

Muddy water | It contains mud and water

Question 32

List four ways you can separate mixtures

Answer 32

Sieving, using a magnet, filtering and evaporating

Question 33

What is evaporating

Answer 33

Liquids turning into vapour

Question 34

What is condensation

Answer 34

Gas turning back to liquid

Question 35

What is distillation

Answer 35

Evaporation followed by condensation

Question 36

What is distillate

Answer 36

Something formed by distillation

Question 37

In the equipment for distillation why does the cooling water enter the condenser at the lower end and leave at the higher end?

Answer 37

So the condenser fills completely and is not effected by gravity

Question 38

Why are glass beads added to the mixture in the round bottom flask

Answer 38

The beads are a surface for bubbles to form on and ensure that smooth boiling takes place

Question 39

In the demonstration we were shown what was the distillate, I.e the substance that was left behind by distillation

Answer 39

The water

Question 40

What would of been left in the round bottom flask if the demonstration had continued.

Answer 40

Solid copper sulphate

Question 41

Why is evaporation a better method for getting the solute from a solution

Answer 41

More solid is obtained by evaporation rather than crystallisation