Particle model

Question 1

Which states have a fixed shape?

Answer 1

Only solids

Question 2

Which states have a fixed volume?

This is how much space something takes up.

Answer 2

Solids and liquids

Question 3

Which states can be compressed (squashed)?

Answer 3

Only gases because there is lots of space between the particles.

Question 4

How are the particles arranged in a solid?

Answer 4

Touching each other
In a regular way in neat rows and columns

Question 5

How are the particles arranged in a liquid?

Answer 5

(most are) touching each other
in a random way

Question 6

How are the particles arranged in a gas?

Answer 6

far apart from each other
in a random way

Question 7

Which state has the most energy?

Answer 7

Gas

Question 8

Which state has the least energy?

Answer 8

Solid

Question 9

How do particle move in a solid?

Answer 9

particles vibrate

Question 10

How do particle move in a liquid?

Answer 10

particles move/slide past each other

Question 11

How do the particles move in a gas?

Answer 11

particles move quickly in all directions

Question 12

Does the number of particles change when we change the state of a substance?

Answer 12

no

Question 13

Name the 5 different changes of state

Answer 13

1 = melting
2 = evaporating or boiling
3 = condensing
4 = freezing
5 = sublimating

Question 14

Which state is this?

Answer 14

solid

Question 15

Which state is this?

Answer 15

liquid

Question 16

Which state is this?

Answer 16

gas

Question 17

What is diffusion?

Answer 17

Diffusion is the movement (spreading out and mixing) of particles​

From an area of high concentration (where there is more of them)​

To an area of low concentration (where there is less of them)

Question 18

What happens when you heat water?

Answer 18

The temperature of the water increases because the particles have more energy and will therefore move faster.

Question 19

What happens when you heat a solid?

Answer 19

When a solid is heated the particles it is made from will have more energy and will therefore vibrate more.

Therefore the particles will move slightly further apart and the solid will expand. This means it gets bigger.

Question 20

What happens when a solid is cooled?

Answer 20

When a solid is cooled the particles is it made from will have less energy and will therefore vibrate less.

Therefore the particles will move closer together and the solid will contract. This means it gets smaller.

Question 21

What is the boiling point of a substance?

Answer 21

The temperature at which a substance changes from a liquid to a gas.

The boiling point of pure water is 100 °C

Question 22

What is the melting point of a substance?

Answer 22

The temperature at which a substance changes from a solid to a liquid.

The melting point of pure water is 0 °C

Question 23

Which states does diffusion happen in?

Answer 23

Liquids and gases but not in solids.

Question 24

Why is diffusion faster at higher temperatures?

Answer 24

Because the particles have more energy and will therefore move faster.

Question 25

What happens when gas particles hit the walls of the container the gas is being kept in?

Answer 25

The apply/exert a force.

The more often they hit the walls or the harder they hit the walls the higher the pressure.

Question 26

Which states flow?

Answer 26

Liquids and gas