Chemistry. It is the branch of science which deals with the composition, preparation and properties of the substances.

Main branches of chemistry: (1) Inorganic chemistry (2) Physical chemistry (3) Organic chemistry (4) Biochemistry (5) Analytical chemistry (6) Agricultural chemistry (7) Industrial chemistry.

Scientific Methods : The scientific method consist of the following five steps :

1 –  To accumulate information through observation

2 –  To organize this information and to seek regularities in it.

3 –  To wonder why regularities are there.

4 –  To frame hypothesis, theories and laws.

5 – To communicate the knowledge to others.

Law: It is a brief statement that can be accepted as general truth.

Hypothesis: It is a provisional conjecture (based upon available data) to explain the known facts about a phenomenon.

Theory: Theory is the result of testing and retesting the hypothesis by experiments under different conditions.

Role of Chemistry: The role of chemistry can be summarized as below :

1 –  Population explosion: Chemistry has solved this growing population by new birth controlling drugs.

2 –  Food for millions: Chemists have developed new fertilizers such as urea etc. and effective insecticides such as DDT for better agriculture.

3 –  Treatment of diseases: Chemists have saved man from dreadful diseases such as malaria, T.B ., Typhoid. They have produced wonderful drugs like penicillin, vitamins, hormones etc.

4 –  Environmental pollution: Chemist are dedicated in devising new methods for checking air and water pollution.

5 –  Energy resources. The chemists are trying to exploit new sources of energy like sea, air etc. meet the demand of energy.

Father of chemistry: Robert Boyle.

Founder of modern chemistry: Lavoisier.



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