Q34 of 203 Page 129

Explain the difference between 2N and N2.

Both 2N and N2 are the forms of nitrogen. 2N denotes two separate atoms of nitrogen whereas N2 denotes one molecule of nitrogen gas.


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32

What is meant by a chemical formula? Write the formulae of one element and one compound.

 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.

 35

What do the following abbreviation stand for?

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

 36

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