Physical & Chemical Changes Notes

• Chemical reactions involve conversion of a chemical substance (elements/compounds) into some other chemical substance (elements/compounds).
• The elements/compounds which combine to form a new substance are called reactants and the new substance formed is called Product.
• A chemical equation is the shorthand notation used to represent a chemical reaction.

Writing a Chemical Equation:

• Usually, chemical equations are written using formulae of elements or compounds.

For example: