Q35 of 203 Page 129

What do the following abbreviation stand for?

(a) O (b) 2O (c) O2 (d) 3O2

(a) O - one atom of oxygen

(b) 2O - two separate atoms of oxygen


(c) O2 - one molecule of oxygen gas


(d) 3O2 - three molecules of oxygen


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33

Write the formulae of the following compounds. Also name the elements present in them.

(a) Water


(b) Ammonia


(c) Methane


(d) Sulphur dioxide


(e) Ethanol.

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Explain the difference between 2N and N2.

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What do the symbols, H2, S and O4 mean in the formula H2SO4?

 37

In what form does oxygen gas occur in nature?