1.3 Particles in solids, liquids and gases.

Question 1

Properties of solids

Answer 1

The particles are arranged in a fixed pattern or lattice. Strong forces hold them together, so they cannot leave their positions.

Question 2

Liquids

Answer 2

The particles in a liquid can move about and slide past each other. They are still close together but not in a lattice. The forces that hold them together are weaker than in a solid.

Question 3

Gas

Answer 3

The particles in a gas are far apart and they move very quickly There are almost no forces holding them together. They collide with each other and bounce off in all directions.

Question 4

Melting point of ice

Answer 4

0 degrees celcius

Question 5

Boiling point of water

Answer 5

100 degrees celcius

Question 6

Freezing point of water

Answer 6

0 degrees celcius

Question 7

Condensation point of steam

Answer 7

Below 100 degrees celcius

Question 8

What happens on heating?

Answer 8

The particles gain energy

Question 9

What happens on cooling?

Answer 9

The particles lose energy and move slowly as they get closer together and the forces of attraction take over.