## Useful Tips To Crack Your Class 12 Chemistry

Chemistry is a strange subject and it covers a wide range of topics. The subject could start with a simple substance and then move on to subatomic particles or complex polymers. Now cracking this could turn out to be challenging. We bring you some tips on how to become a better student and score well in CBSE class 12 chemistry.…

## What you need to write better chemistry notes (and what not)?

Chemistry is one strange subject. It begins with a simple substance and goes above complex polymers – and, down to subatomic particles. I have been writing a lot recently on how to read, revise and make notes etc., to help you become a better student. Class notes aren’t always the best solution and if you are aspiring to become a…

## The Nobel Prize in Chemistry 2013

Classical mechanics is considered to be just opposite to quantum physics in terms of theory and practical models. Classical mechanics, especially Newtonian Mechanics, and quantum mechanics are definitely two fundamental but equally different branches of physics having no significant connection to each other. These completely disjoint subjects were glued by the work of the trio of Martin Karplus, Michale…

## Consequences of Light Absorption – The Jablonski Diagram

All about the Light Absorption’s theory on the basis of Jablonski diagram. According to the Grotthus – Draper Law of photo-chemical activation: Only that light which is absorbed by a system, can bring a photo-chemical change. However it is not true that all the kind of light(s) that are absorbed could bring a photo-chemical change. The absorption of light may result in…

## Classical Theory of Raman Scattering

The classical theory of Raman effect, also called the polarizability theory, was developed by G. Placzek in 1934. I shall discuss it briefly here. It is known from electrostatics that the electric field $E$ associated with the electromagnetic radiation induces a dipole moment $mu$ in the molecule, given by $\mu = \alpha E$ …….(1)…

## The Lindemann Theory of Unimolecular Reactions

[ Also known as Lindemann-Hinshelwood mechanism.] It is easy to understand a bimolecular reaction on the basis of collision theory. When two molecules A and B collide, their relative kinetic energy exceeds the threshold energy with the result that the collision results in the breaking of comes and the formation of new bonds. But how can one account for a…

## CV Raman, Raman Effect on Raman Spectroscopy and Raman Scattering

Chandrasekhar Venkat Raman Chandrasekhar Venkat Raman, also known as Sir CV Raman, was a Physicist, Mathematician and a Nobel Laureate. Venkat (his first name) was a Tamil Brahmin and was the second of the eight children of his parents. He was born at Thiruvanaikaval, near Tiruchirappalli on 7th November 1888. He was the second of their eight children. His father was…

## Radioactive Pollution

What is Radioactive Pollution? Radioactive Substances and nuclear radiations (i.e., alpha, beta & gamma-particles) produced during nuclear reactions, affect our environment adversely and thus radioactive pollution is created. Sources of Radioactive Pollution Low level radioactive liquid wastes, radioactive gaseous wastes & dusts are released during nuclear explosions. Effects of Radioactive Pollution I. The radioactive gaseous wastes are injected into the…

## Top 5 Chemists Killed or Injured by their Experiments

Karl Scheele Died while testing his discoveries Scheele was a brilliant pharmaceutical chemist who discovered many chemical elements-Oxygen, Molybdenum, Tungsten, Manganese and Chlorine. He also discovered a process very similar to pasteurization. Scheele had the habit of taste testing his discoveries and, fortunately, managed to survive his taste-test of hydrogen cyanide HCN. But alas, his luck was to run out:…

## Entropy and Disorder

In science, we look for patterns to discover nature’s laws. What is the pattern common to all spontaneous changes? To find a pattern, it is often best to start with very simple examples, because then the pattern is likely to be more obvious. So let’s think about two simple spontaneous changes — the cooling of a hot metal and the…