Class: X
Chemistry
Ch.1: Chemical reactions and equations
- Chemical reaction: A chemical reaction involves a chemical change in which substances react to form new substances with entirely new properties. Substances that react or take part in the reaction are known as reactants and the substances formed are known as products.
- Physical change: If a change involves change in colour or state but no new substance is formed, then it is a physical change.
- Chemical change: If a change involves formation of new substances, it is a chemical change.
- Chemical equation: The symbolic representation of a chemical reaction is called a chemical equation.
