revision

The gas is making the Earth get warmer.

• Oxygen

• Carbon dioxide

• Natural gas

The most amount gas in air.

• Oxygen

• Carbon dioxide

• Nitrogen

The gas we need to breathe

• Oxygen

• Nitrogen

• Carbon Dioxide

the gases have no color

• carbon dioxide and oxygen

• nitrogen and oxygen

• nitrogen and carbon dioxide

sorting materials depending on their properties

• describing

• classifying

• observing

The things we used to separate the mixture

• objects

• equipments

• equiments

We can use ................. to separate the mixture of sand and beans.

• filter

• magnet

• sieve

We can use .............. to separate a mixture of pins and sand.

• filter

• sieve

• magnet

vinegar is

• soild

• liquid

• gas

Mixing vinegar and bicarbonate of soda makes a gas called ........................

• oxygen

• nitrogen

• carbon dioxide