Paper1-SC1/SC2

Question 1

What is fractional distillation?

Answer 1

When two or more liquids are separated(boiling points have to be different).

Question 2

Can compounds be pure?

Answer 2

Yes.

Question 3

What is a solution?

Answer 3

A mixture made of solutes(dissolved substances)in a liquid called the solvent.

Question 4

Describe the equipment for distilation.

Answer 4

Question 5

What is the residue?

Answer 5

The substance that is left behind in filtration.

Question 6

Describe the equipment for filtration.

Answer 6

Question 7

What is chemical analysis?

Answer 7

Using simple chemical reactions or sensitive machines to identify and measure the substance in a sample.

Question 8

What is gas to solid called?

Answer 8

Deposition.

Question 9

How can we make water pure?

Answer 9

Distilation.

Question 10

Describe the equipment for simple distillation.

Answer 10

Question 11

What is a saturated solution?

Answer 11

When as much of the substance can dissolve as possible.

Question 12

Describe the equipment for crystalisation.

Answer 12

Question 13

What is the composition of a pure substance?

Answer 13

Cannot be changed and is the same in all parts of a piece of substance. It cannot be separated into other substances using physical methods.

Question 14

What is the Rf value?

Answer 14

The distance the compound has risen divided by the distance the solvent has risen. This does not change if the conditions.

Question 15

What is the equation for Rf value?

Answer 15

Question 16

What is a mixture?

Answer 16

Contains elements and/or compounds that are not chemically joined together. You can use physical methods to separate mixtures into different substances.

Question 17

Is melting point a physical property?

Answer 17

Yes.

Question 18

What is crystallisation?

Answer 18

Solutes can be separated from a solution by evaporating the solvent to leave the solutes behind. If the crystals form slower, the particles have longer to form the crystals will be larger.

Question 19

What can chromatography be used for?

Answer 19

It can be used to find out which coloured compounds the mixture contains.

Question 20

Describe the equipment for fractional distillation.

Answer 20

Question 21

Describe the equipment for chromatography.

Answer 21

Question 22

What is the positive of paper chromatography?

Answer 22

It is more simple as some compounds dissolve better in a solvent than others.

Question 23

Explain the core practical on separating mixtures.

Answer 23

Question 24

What is a hazard?

Answer 24

Something that could cause harm.

Question 25

Describe the three states.

Answer 25

Question 26

What is the mobile phase?

Answer 26

The solvent.

Question 27

What is the filtrate?

Answer 27

The substance that has passed through the fine holes in filtration.

Question 28

What are the stages of puryfing water to drink?

Answer 28

Question 29

What can filters be used for?

Answer 29

They can be used to separate some mixtures, they let smaller pieces or liquids through but trap bigger pieces or insoluble substances.

Question 30

Describe charts for pure and impure substances changing states.

Answer 30

Question 31

What is the stationary phase?

Answer 31

The paper.

Question 32

What is the chromatogram?

Answer 32

The paper with all the separated components.

Question 33

What is solid to gas called?

Answer 33

Sublimation.

Question 34

What is pure water better for rather than tap water?

Answer 34

Chemical analysis and car-cooling systems.

Question 35

How are particles attracted to each other?

Answer 35

Weak forces of atraction.

Question 36

What is desalination?

Answer 36

Producing pure water from sea water and can be achieved using simple distilation.