Unit

Learning Objectives After studying this unit, students will be able to • explain the importance of chemistry in different spheres of life. • classify different substances into elements, compounds and mixtures. • define atomic mass and molecular mass. • define the amount of substance using SI unit 'mole'.

• describe Avogadro number. • explain the relationship among mass, moles and number of atoms (or) molecules and perform calculations relating to the conversions. • define equivalent mass and calculate equivalent mass of acid, base and oxidising/reducing agents. • deduce empirical and molecular formula of a compound from experimental data.

• solve numerical problems based on stoichiometric calculations. • identify the limiting reagent and calculate the amount of reactants and products in a reaction. • define the terms oxidation, reduction, oxidant and reductant. • predict the oxidation states of elements in various compounds.

• explain the process involved in a redox reaction and describe the electron transfer process. • classify redox reactions into different types. • formulate a balanced redox reaction from two half-reactions. We think there is colour, we think there is sweet, we think there is bitter, but in reality there are atoms and a void.

– Democritus Natural Fibre (Cotton) Synthetic Fibre (Nylon) Pesticide (Malathion) Pharmaceutical (Tablets) Refinery (Oil)