Total number of reactions we study in chemistry is very large. They are of numerous types. In lesson 2, you have learnt how to write and balance chemical equations. In this lesson you will learn, how chemical equations can be classified into various categories on the basis of some of their features. You will also learn about the information that can be obtained from a balanced chemical equation and how we can use this information for making calculations. You have learnt about acids, bases and salts in earlier classes. In this lesson you will learn more about them.