General Introduction of Chemistry
↪ Chemistry is a branch of science which deals with the properties, composition and transformation of matter.
↪ It is a science where chemists put their views on systematic organization and explanation of facts observed by experiments to all kinds of matter.
↪ Chemistry begins with the knowledge of common elements and compounds.
↪ It deals with the study of composition and properties of matter and also physical and chemical interaction which may take place among matters.
↪ "Antoine Lavoisier" is considered as the father of 'Modern Chemistry'.
Introduction to Matter
↪ Anything that occupies space, possess mass, offers resistance and can be felt by one or more of our sense organs is called matter.
↪ Air, water, soil, rock, wood, glass, iron, etc. are few familiar forms of metals.
↪ Physically as solid, liquid and gas.
↪ Chemically as pure and impure substances.
⁕ Pure Substance
↪ A pure substance is homogeneous matter and it has definite composition which doesn't change with time and distributes uniformly throughout its bulk.
↪ Elements: metals, non-metals and metalloids and also Compounds: such as organic and inorganic compounds are pure substances.
⁕ Impure Substance
↪ An impure substance is a mixture of two or more than two pure substances.
↪ It may be homogeneous or heterogeneous.
↪ A mixture of NaCl and sand is an impure substance.
⁕ Classification of Matter
Introduction to Scientific Law and Theory
↪ Rapid advancement of chemical science is based on discovery of different scientific laws and theories.
⁕ Scientific Law
↪ Statement of results obtained by experiments.
↪ It can say what happens but it can't answer why does it happen.
↪ By comparison of different laws, sometimes it may inspire to guess other relationships.
↪ Such relations are called hypothesis.
↪ A proposed model introduced to establish a relationship between hypothetical causes and experimental observations.
↪ Scientists propose theory by introducing set of hypothesis to explain, the cause of observed results.
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K yo sab notes bata 11ko entrance exam ma aauxa ra
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