Matter

Question 1

Why do the particles in a solid have a fixed shape?

Answer 1

Particles cannot change position

Question 2

Why do liquids and gases not have a fixed shape?

Answer 2

Particles can change position

Question 3

Why does a gas not have a fixed volume?

Answer 3

Particles are free to move anywhere

Question 4

Describe how particles move in (a) solids (b) liquids and c) gases

Answer 4

Particles vibrate (b) particles tumble over each other
(c) particles move freely in all directions

Question 5

Diffusion

Answer 5

Particles mixing without stirring

Question 6

Why can you smell perfume from a distance?

Answer 6

Perfume particles diffuse through the air

Question 7

Why do solids not diffuse?

Answer 7

Particles cannot change position

Question 8

What happens to particles when they are heated?

Answer 8

Particles move faster

Question 9

Melting

Answer 9

Solid changing to a liquid

Question 10

Evaporation

Answer 10

Liquid changing to a gas

Question 11

freezing

Answer 11

Liquid changing to a solid

Question 12

condensation

Answer 12

Gas changing to a liquid

Question 13

Explain why you feel cold when you come out of a swimming pool?

Answer 13

Water evaporates from your skin using up heat from your body

Question 14

Solute

Answer 14

Solid that dissolves

Question 15

Solvent

Answer 15

The liquid that dissolves the solid

Question 16

Soluble

Answer 16

dissolves

Question 17

Solution

Answer 17

Mixture produced when a solid dissolves in a solvent

Question 18

Insoluble

Answer 18

does not dissolve

Question 19

Difference between a dilute solution and a concentrated one.

Answer 19

A dilute solution has less solute dissolved than a concentrated solution.