Introduction to gases, liquids and solids.
Various Methods of Separation
Distillation and Fractional distillation
Differences between elements, compounds, and mixtures.
Pure Substances
What is the overall charge of an atom if there are 3 protons, 3 electrons, and 3 neutrons?
What is the difference between molecular mass and formula mass?
What are the characteristics of pure substances in points?
How many atoms are there in 1 gram of carbon?
How many oxygen atoms are there in 90g of H2O molecule?
What is the number of moles of O-atom in 126 AMU of HNO3?
Chemical Bond 
Atomic Structure
Atomic Models
Mole Concept
What is valency ? How to calculate it?