Chemical symbol is a short notation derived from the scientific name of a chemical element—e.g., S for sulfur and Si for silicon.
A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. eg- Water is composed of hydrogen and oxygen in a two to one ratio. The chemical formula for water is H 2 O. One more eg we can give of is Sulfuric acid which is composed of the elements hydrogen, sulfur, and oxygen. The chemical formula for sulfuric acid is H 2 SO 4 .
the method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as chemical equation.for example, Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas
this can be represented by chemical equation as follows, (see the above pic)
I hope it helps u!!!
