- A chemical reaction written in the form of formula equation shows the change of reactants to products by an arrow placed between them.
- The reactants are written on the left side of arrow and the final substances or products are written on the right side of the arrow.
- The arrow head points towards the products and shows the direction of reaction.
- If there are more than one reactant or product involved in the reaction, they are separated with a plus (+) sign between them.