five key concepts

n - neutron U - 235 Uranium Ba - Barium Kr - Krypton E - Energy Note : The number of neutrons released in a uncontrolled chain reaction of U-235 nuclei is given by 3 n where n = 1,2,3,..... A Schematic Diagram Showing Essential Steps in a Chain Reaction Based on Fission of U-2..

Diagonal relationship - It refers to the similarly in the properties of some of the elements of 2nd period to diagonally opposite elements of 3rd period. The pair of elements showing diagonal resemblance are: LiMg, Be..Al and B.S..

Uncertainty Principle - It is not possible to measure simultaneously both the position and velocity (or momentum) of a microscopic particle with absolute accuracy or certaint..

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 expressi..

Mole Concept - Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is taken for all practical purposes. Avogadro discovered that under standard conditions of temperature and pressure, (1atm and 273K) a sample of gas occupi..

Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is taken for all practical purposes. It was discovered that the number of atoms present in 12g of carbon of 12 C isotope is 6.023 x 10 23 atoms. This is referred to as Avogadro num..

Example: 5 - How many moles of sodium hydroxide are present in 3200 g of it? (Na=23, O=16, H..

Organic Chemistry - Basic Concepts - Organic chemistry is a branch of chemistry that deals with the study of compounds of hydrogen and carbon (hydrocarbons) and their derivatives. Hydrocarbons and their derivatives are termed organic compounds. e.g., Methane (CH 4 ), ethyl alcohol (C 2 H ..

Arrhenius in 1887 put forward this concept. Accordingly, an acid is a hydrogen-containing compound, which gives free hydrogen ions when dissolved in water. A base is a hydroxyl group containing compound which gives free hydroxyl ions (OH - ) when dissolved in water. Thus, according to th..

The orbital concept of hyperconjugation is well illustrated with the help of propene. In this, the electron pair of C-H bond ( s - bond) is involved in conjugation with the p -electron pair of the double bond. In hyperconjugation the delocalisation of s -electrons of H-C bond takes pl..