CHAPTER
– 1
Chemistry
The branch of science which deals with the
composition and properties of matter, changes in matter and the laws or
principles which govern these changes is called Chemistry.
Branches of Chemistry
Physical Chemistry
The branch of chemistry which deals with the physical properties and physical behavior of material things is called physical chemistry.
Inorganic Chemistry
The study of all elements and their compounds except carbon is called inorganic chemistry.
Organic Chemistry
The branch of chemistry in which we study the compounds of carbon is called organic chemistry.
Analytical Chemistry
The branch of chemistry which discusses the analytical methods for getting information about chemical compounds and chemical processes is called analytical chemistry.
Biochemistry
The study of chemical compounds present in living things is called biochemistry.
The study of chemical compounds present in living things is called biochemistry.
Industrial Chemistry
The application of chemical knowledge in technology and industry and the preparation of industrial products are called industrial chemistry.
Steps
Involved in Getting Information in the Scientific Method
Science
is not only an integrated knowledge of physical and biological phenomena but
also the methodology through which this knowledge is gathered. The process of
scientific discoveries is a cyclic process.In science the facts are gathered through observations and experiments and then theories or law are deduced. The scientific method include following four steps:
1. Observation
2. Inference
3. Prediction
4. Experiment
1. Observation
The observations are made by the five senses of
man. Men made equipments are also used for making observations. For example
microscope is used for observing minute objects. Thermometer is used to measure
temperature. Sensitive balance is used to determine the mass of a very light
object. The capacity of man made instruments is also limited. But it can be
improved by improving technology. Thus better and more reliable information are
given to the scientists who produce better result. Information acquired through
careful observations are called facts. These facts are foundation of scientific
knowledge.
2. Inference
The facts gathered through observations are
carefully arranged and properly classified. Correlating the knowledge thus
acquired with previous knowledge, we try to think of a tentative solution to
explain the observed phenomenon. The tentative solution is called hypothesis.
The validity of this hypothesis is tested through the results obtained from
experiments. The results are discussed by the scientists and the hypothesis is
accepted or rejected. The accepted hypothesis then takes the form of theory. A
theory when repeatedly gives the same results after experimentation and gives
correct explanation of the scientific facts becomes a law or principle.
A theory remains valid until contrary informations are given on the basis of experimentation. Thus a hypothesis requires experimental support. But Avogadro’s hypothesis has been accepted as law without any experimental support.
A theory remains valid until contrary informations are given on the basis of experimentation. Thus a hypothesis requires experimental support. But Avogadro’s hypothesis has been accepted as law without any experimental support.
3. Prediction
Facts, theories and laws which are deduced from
observation can help in deducing more facts and phenomenon. This process is
called prediction.
4. Experiment
An experiment is an integrated activity, which is
performed under suitable conditions with specially designed instruments to get
the required information. Such information is used to test the validity of the
hypothesis. If a hypothesis is proved correct. It increases the reliability of
known facts. If it is proved wrong, it stil can give information which can be
used to deduce other results.
Chemistry and Society
Chemistry has played important role for well being
of mankind in the form of food, clothing, shelter, medical treatment and
chemical fertilizers, crops protected by insecticides, refined food and
production of artificial fiber. Production of cement, iron bricks, glass, paint
etc are all due to chemistry.
The hazards of chemistry are so vast that no aspect of human life has remained unaffected. The smoke coming from chimneys of chemial industries and from vehicles pollute the air. It is very dangerous to breath in that air. Similarly waste water from industry, pollute canals, rivers and has bad effect on land. Excessive chemical spray on plants also has bad effect.
The hazards of chemistry are so vast that no aspect of human life has remained unaffected. The smoke coming from chimneys of chemial industries and from vehicles pollute the air. It is very dangerous to breath in that air. Similarly waste water from industry, pollute canals, rivers and has bad effect on land. Excessive chemical spray on plants also has bad effect.
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