Term 2: Keywords

Question 1

State

Answer 1

The form that a substance is in; solid, liquid or gas.

Question 2

Particles

Answer 2

Tiny pieces that make up everything around us.

or

Small units that make up matter such as atoms or molecules.

Question 3

Vacuum

Answer 3

A space with no air or matter inside.

or

A space devoid of matter, with very few or no particles.

Question 4

Solids

Answer 4

A state of matter that has a fixed shape and volume.

Question 5

Liquid

Answer 5

A state of matter that flows and takes the shape of its container.

Question 6

Gas

Answer 6

A state of matter that spreads out to fill any space.

Question 7

Mixture

Answer 7

A combination of two or more substances that can be separated.

or

When two or more substances are joined together, but not chemically bonded to each other.

Question 8

Separate

Answer 8

To divide or take apart different substances in a mixture.

Question 9

Solution

Answer 9

A mixture where one substance completely dissolves in another.

Question 10

Solvent

Answer 10

The liquid in which a substance dissolves.

Question 11

Solute

Answer 11

The substance that dissolves in a liquid to form a solution.

Question 12

Insoluble substance

Answer 12

A substance that does not dissolve in a liquid.

Question 13

Dissolve

Answer 13

When a substance mixes completely with a liquid and forms a solution

Question 14

Saturated solution

Answer 14

A solution that cannot dissolve any more of a substance.

Question 15

Pollution

Answer 15

Harmful substances that dirty the air, water or land.

Question 16

Sewage

Answer 16

Dirty water and waste that comes from homes and buildings.

Question 17

Wetlands

Answer 17

Areas of land that are often covered with water, like swamps or marshes.

Question 18

Swampy

Answer 18

Wet, muddy and soft land, often found near water.

Question 19

Pure

Answer 19

Something that is clean and not mixed with anything else.

Question 20

Variety

Answer 20

A large number of different things or choices of something.

Question 21

Homogeneous mixtures

Answer 21

Where the two substances that are mixed looks the same and you can’t see the different parts, eg sugar that dissolves in water.

Question 22

Heterogeneous mixtures

Answer 22

Where the two substances that are mixed stays separate and you can see the different parts, eg a bowl full of nuts and raisins.

Question 23

Temperature

Answer 23

How hot or cold something is.

Question 24

Grain-size

Answer 24

How large or small the particles of a substance are.

Question 25

Variable

Answer 25

Something that can change in an experiment

Question 26

Rate

Answer 26

How fast or slow something happens.

Question 27

Evaporation

Answer 27

When a liquid slowly turns into a gas.

Question 28

Crystallisation

Answer 28

When a solute comes out of a liquid and forms hard crystals.

Question 29

Melt / Melting

Answer 29

Occurs when a solid turns into a liquid due to heat.

Question 30

Effluent

Answer 30

Dirty water or chemicals that end up in rivers, lakes or the soil.

Question 31

Water table

Answer 31

The level in the soil where water is found. It is the top layer of underground water.

Question 32

Purification

Answer 32

The process of cleaning something by removing dirt and harmful substances.

Question 33

Unpurified water

Answer 33

Water that has not yet been cleaned and may contain dirty or hazardous substances.

Question 34

Still water

Answer 34

Water that does not flow, such as in a pond or pool.

Question 35

Settling

Answer 35

When heavy particles sink to the bottom in a liquid.

Question 36

Decanting

Answer 36

When liquid is carefully discarded after settling. or To gradually pour a liquid from one container into another, typically in order to separate out sediment.