Everything about chemistry

Oxygen-atomic Number-8. In the discovery of oxygen 3 scientists give contribution. 1. Before 1604 - Michael sendivogius. 2. In 1773- carl wihelm. 3. 1774- priestly . The name oxygen was given in 1777 by Antoine lavoisier. By mass is the third most abundant element.   Nasent oxygen is harmful ( O). It is useful when it is O2 ; dioxygen. It is colourless,odourless gas. Dioxygen constitutes 20.8% earth atomsphere.  Naturally occurring oxygen is in form ( 16 O) isotope most abundant i.e.99.76%. Another form of oxygen is ozone ( O3). Ozone helps us in protecting from ultraviolet radiation,harmful rays . It is basically umbrella of Earth. Universe contains 'oxygen' at the rate of : 1% Sun contains 'oxygen' at the rate of:0.9% Oceans contains'oxygen'at the rate of:23% Human body contains'oxygen'at the rate of:61% The earth's crust consists of 'oxygen'at the rate of:46% Meteorites consist of'oxygen'at the rat...

Anything which has mass & occupies space is called matter. Everything around us , for example book, pen , pencil, water, paper,air,all living beings etc. are composed of matters. Matter exist in three physical State. 1.solid : have definite volume & shape 2.liquid : have definite volume but not definite shape 3.gas :  have neither definite volume nor shape. These three physical State are interchangeable..  Soliid~ liquid ~ gas  by  heating or cooling. At microscopic level , matter can be classified as. Mixture or pure substance. 1. Types of mixture.                      2. Pure substance                                                           a) elements                 ...

1.Organic chemistry:    IT is study of  most carbon containing compounds https://en.wikipedia.org/wiki/Organic_chemistry?wprov=sfla1 Application: pharmaceuticals, different industries , research, plastic,  2.Inorganic chemistry:   IT is the study all elements others than carbon . Means others compound which contains carbon this also come under inorganic chemistry.  https://en.wikipedia.org/wiki/Inorganic_chemistry?wprov=sfla1 Application:  minerals, metals& non- metals, semiconductor, electrochemistry, research. 3.Physical chemistry:   The study of behaviour & changes of matter &the releted energy changes. https://en.wikipedia.org/wiki/Physical_chemistry?wprov=sfla1 Application: chemical kinetics, thermodynamics, viscosity, surface tension . 4.Analytical chemistry: compounds & their composition analysis, industry, production. Application  :industry food nutrients, quality control. 5...