1. Chemical industries are divided into heavy and fine chemicals. Heavy chemicals deal in large quantities of crude or less purified chemicals. Fine chemicals are completely purified substances produced in limited quantities. 

2. Chemicals can be classified based on quantity, chemical composition, availability, and application. Heavy chemicals include mineral acids and bases while fine chemicals include specialty solvents and medicines. Organic compounds contain carbon while inorganic compounds do not. Natural compounds come from nature while synthetic compounds are man-made. 

3. Chemical manufacturing involves converting raw materials into useful products through unit operations and unit processes. Unit operations involve physical changes like transportation and heat transfer while unit processes involve chemical changes.

Classification: BS Chemistry Chem-121 Applied Chemistry 4 Heavy and Fine Chemicals PDF

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