Grade 4: revision of states of matter

Atmosphere is ...

(choose one option)

• the gaseous layer around the Earth.

• the layer of dirt on the Earth's surface.

• the layer of liquid metal under the Earth's crust.

• the chain of asteroids around the Earth.

Which gas is NOT found in the Earth's atmosphere?

• Oxygen

• Nitrogen

• Water vapour

• Carbon dioxide

• Hydrogen sulfide

A big factory produces a lot of nitrogen dioxide every day.

Nitrogen dioxide is released into the atmosphere.

What do we call this process which is harmful to Nature?

• Industrial production

• Earth contamination

• Water pollution

• Air pollution

Fill the gap in the sentence below.

Air ......................... is when harmful substances are released into the atmosphere.

How are particles arranged in a gas?

• Packed tightly and vibrating in fixed positions

• Loosely arranged and sliding past one another
  

• Far apart and moving freely in all directions

• • Closely packed in a regular pattern

How are particles arranged in a solid?

• Packed tightly and vibrating in fixed positions

• Loosely arranged and sliding past one another
  

• Far apart and moving freely in all directions

• • Closely packed in a regular pattern

How do particles in a gas move?

• They vibrate in place

• They slide past each other slowly

• They move randomly at high speeds in all directions

• 4. They are stationary

How do particles in a liquid move?

• They vibrate in place

• They slide past each other

• They move randomly at high speeds in all directions

• 4. They are stationary

The boiling point of a liquid is the ....................................... at which the liquid boils.

A substance has melting point of 13°C, and boiling point of 73°C.

What is this substance at -10°C?

• solid

• liquid

• gas