gr 6 oxygen

- It is a rapid union between oxygen and element that produces heat and light

A slow combination of oxygen with an element in the presence of moisture.

A layer that protects the earth from harmful radiation that comes from sun

The oxygen gas is produced plentifully from ……………… during ………………..

Oxygen is ……………… than air, so it can replace air .

The mass of cleansing wire increases when you burn it G.R

A gas forms 78 % of the air volume.

……………. and ………….. are from the uses of oxygen gas .

- The gas represents one fifth of the volume of atmosphere.

Catalyst used in preparation of oxygen gas.

A gas form 21 % of the air volume.

A substance that remains without any change in its quantity and properties during the chemical reaction