EASY
Lower Secondary Stage 7
IMPORTANT
Earn 100

Two students were discussing what happens to a solid when it melts. 

Jack: The solid particles will turn into liquid particles. 

Mira: The particles will stay the same. 

Which student is correct? 

Important Questions on Properties of Matter and Materials

HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 5 - Properties of Matter and Materials>End of chapter review>Q 11

Two students were discussing what happens to a solid when it melts. 

Jack: The solid particles will turn into liquid particles. 

Mira: The particles will stay the same. 

Describe what happens to the particles when a solid melts. 

HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 5 - Properties of Matter and Materials>End of chapter review>Q 13

A cup of water was left in a room overnight. Predict what would happen to the volume of water in the cup. Give a scientific explanation for your prediction. 

HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 5 - Properties of Matter and Materials>End of chapter review>Q 14

The melting point of iron is much higher than the melting point of water. Suggest why. Use particle theory in your answer.