Chemical Reaction

Things to remember

• Physical change is a temporary or reversible change in which no new substances are formed.
• A chemical change is a permanent and usually irreversible change in which new substances with different properties are formed.
• Chemical changes are permanent changes.
• Physical changes are temporary a change.
• The chemical reaction which is expressed by using molecular formulae of reactants and products is called chemical equation
• The chemical reaction which is expressed in terms of full names of reactant and product molecules is called word equation.