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The mass of cleansing wire increases when you burn it G.R
Due to the combination with oxygen during burning.
……………. and ………….. are from the uses of oxygen gas .
answer
Oxygen is ……………… than air, so it can replace air .
heavier
The oxygen gas is produced plentifully from ……………… during ………………..
green plants- photosynthesis
A substance that remains without any change in its quantity and properties during the chemical reaction
catalyst
A gas form 21 % of the air volume.
oxygen
A gas forms 78 % of the air volume.
nitrogen
A layer that protects the earth from harmful radiation that comes from sun
ozon layer
- It is a rapid union between oxygen and element that produces heat and light
burning
- The gas represents one fifth of the volume of atmosphere.
oxygen
Catalyst used in preparation of oxygen gas.
magnesium dioxide
A slow combination of oxygen with an element in the presence of moisture.
oxidation
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