What do you mean by the chemical formula of a compound? What is the importance of it? What are the rules for writing a chemical formula?

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Detailed Solution

Chemical formula: The chemical formula of a compound is a symbolic representation of its composition.
Importance: A Chemical formula gives the exact number of atoms of the same or different elements present in a chemical substance.
To write chemical formulae, the symbols of elements and the combining capacities of elements are required.

Rules for writing chemical formulae:
• The valencies or charges on the ion must be balanced.
• In writing formulae of a compound, the metal comes first, followed by the non-metal.

For example, chemical formula of HCl can be written as:

1. First, we write the constituent elements in the compound.
2. Then, write their valencies.
3. After that, we must cross over the valencies of the combining atoms.