1.

What is Chemical formulae. Write the Characteristics of chemical formulae.

Answer»

Chemical formulae 

It is the symbolic representation of the composition of a compound. 

Characteristics of chemical formulae 

• The valencies or charges on ion must balance. 

• When a compound is formed of metal and non-metal, symbol of metal comes first. E.g., CaO, NaCl, CuO. 

• When polyatomic ions are used, the ions are enclosed in brackets before writing the number to show the ratio. E.g., Ca(OH)2, (NH4)2SO4



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