Question

Define chemical formula

Answer 1

Answer:

Explanation:A compound is a substance made up of a definite proportion of two or more elements. A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.

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Answer 2

Chemical Formulae

A chemical formula represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule.

Two broad categories :

1: Formulae of elements:-

The chemical formula of an element is a statement of the composition of its molecule in which symbol tells us the element and the subscript tells us how many atoms are present in one molecule.

Example :- H₂ , N₂ , Br₂ , I₂ , etc.

2: Formulae of compounds:-

Chemical formula of a compound is a statement of its composition in which the chemical symbols tell us which elements are present and the subscripts tell us how many atoms of each element are present in one molecule of the compound.

Example :- H₂0 , CO₂, NH₄, C₂H₅OH, etc.