Chemistry

AIR POLLUTION Contamination of air with smoke, dust and harmful gases is called air pollution and the substances causing pollution are called as pollutants. The common pollutants are: Gases like sulphur oxides, nitrogen oxides, carbon oxides and hydrogen sulphide, smoke soot and particulate matter etc. SOURCES OF AIR POLLUTION Burning/combustion …

What is water pollution? The contamination of water with unwanted and harmful substances is called water pollution. The sources of water pollution are industrial wastes, synthetic detergents, agricultural run-offs, oil leakage etc. Water pollution affects the aquatic life, makes the water non potable for drinking and causes a phenomenon known …

POLYMERS Polymers can be defined as the high molecular mass macromolecules that are formed due to the repetition of the basic unit, monomer. MONOMER The unit molecules that combines with each other to form a polymer. POLYMERISATION The process of formation of polymers by the repeated addition of the monomers …

ACIDS Acids are those substances which have a sour taste and can turn blue litmus red. BASES Bases are those substances which have a bitter taste and can turn red litmus blue. ARRHENIUS CONCEPT An acid is any hydrogen containing compound which gives H+ ion in aqueous solution. While, base …

Increase in the concentration of carbon dioxide in the air is one of the major causes of global warming. When the solar radiation fall on the earth’s surface, a part of the radiation is absorbed and a part is reflected back into the space. Green house gases like carbon dioxide …

MATTER Anything which occupies space and has mass is known as matter. For eg, air, water, milk, hydrogen. Everything around us is made up of tiny particles. The particles which make up the matter are known as atoms. These small particles are in constant motion, which is known Brownian movement. …

ATOMIC Structure and ATOM Atom is the smallest particle of an element. It consists of a nucleus, which is composed of neutron and proton, whereas, electrons are found outside the nucleus. Democritus, a Greek philosopher (460-370 BC) gave an idea that matter is composed of small non-dividing particle, which he …

Periodic Table – Elements Periodic is an arrangement of elements, ordered by their atomic number and electron configuration. In the table rows are called as periods and columns are called groups. The Russian chemist Dmitri Mendeleev develops the periodic table based on their properties in 1869. Please see the below …