HARD
Lower Secondary Stage 7
IMPORTANT
Earn 100

Use particle theory to explain why you can compress a gas, but you cannot compress a solid or a liquid. 

Important Questions on Properties of Matter and Materials

MEDIUM
Lower Secondary Stage 7
IMPORTANT

A diamond is hard and cannot be scratched easily. Use particle theory to suggest why?

MEDIUM
Lower Secondary Stage 7
IMPORTANT

Name the change of state happening in the example listed below. 

A gold ring is heated until it turns into liquid gold. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT

Name the change of state happening in the example listed below. 

Drops of water form on a bathroom mirror. 

EASY
Lower Secondary Stage 7
IMPORTANT

Name the change of state happening in the example listed below. 

A chocolate bar is left in a warm kitchen. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT

Name the change of state happening in the example listed below. 

A layer of ice forms on top of a lake in winter. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT

Three students were asked what would happen to the mass of an ice cube as it melted. Who is correct? 

Aisha: The mass will go down because liquids have less mass than solids. 

Zain: The mass will stay the same because no particles in the ice have been lost or gained. 

Adnan: The mass will go up because the water takes up more space than the ice. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT

Describe what happens to the particles when a liquid is heated to form a gas. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT

State if the following material is flexible, brittle or malleable: 

Glass jug.