high school chemistry notes

Polythene is formed by the addition polymerization of multiple monomers of ethylene or ethene. When liquid ethylene is polymerized at high temperature and pressure, a resin of polyethylene is obtained. It can be melted spun or moulded as desired. Note that in addition polymeriza..

Polythene is formed by the addition polymerization of multiple monomers of ethylene or ethene. When liquid ethylene is polymerized at high temperature and pressure, a resin of polyethylene is obtained. It can be melted spun or moulded as desired. Note that in addition poly..

Pollution of Water - Pollution of the environment is a major global problem of today. It is heartening to note that in the last 25 years or so, scientists and environmentalists have created a great deal of awareness on environment pollution. Several national and international laws and cha..

Evaporation is the process of conversion of a liquid into its vapours at room temperature. When a liquid is placed in an open vessel, it gradually evaporates and is converted into its vapours. The molecules of liquids escape from the surface inspite of strong intermolecular cohesive forces among t..

. At high altitudes like Ooty, having lower atmospheric pressure, water boils at a much lower temperature than in the plains like Bangalore where atmospheric pressure is higher. Generally, boiling points for most of the liquids are specified as normal boiling points. The normal boiling po..

Maxwell's Distribution of Molecular Speeds - On plotting a fraction of molecules having different speeds against the speeds of the molecules (along x-axis) a curve known as Maxwell's distribution curve is obtained. The important features of which are: The fraction of molecules with very low or very..

According to wave mechanics, we cannot simply say that the electron exists at a particular point but we talk about certain regions in space around the nucleus where the probability of finding the electron is maximum. Such regions are expressed by mathematical expressions and are called orbital wave..

Concept of Orbital - According to wave mechanics, we cannot simply say that the electron exists at a particular point but we talk about certain regions in space around the nucleus where the probability of finding the electron is maximum. Such regions are expressed by mathematical expressions and ar..

Fig: 3.8 - Electromagnetic spectrum It is interesting to note that visible light, which the human eye detects, constitutes only a small portion of the total electromagnetic spectrum. The visible spectrum is shown separately. Violet colour has a radiation of minimum wavelength (380nm) and ..

Measurement of Enthalpy of Reactions - The heat changes in chemical reactions are measured with the help of calorimeters. Depending upon the requirements of experiments different types of calorimeters are used. In general, reactions taking place at constant volume and involving gases are carried ou..