principle of change

A mixture of solid substances, such as camphor, benzoic acid, ammonium chloride, iodine etc., containing non-volatile substances, when heated, change directly into vapour without passing through the liquid stat..

When carbon dioxide is passed into a concentrated solution of brine saturated with ammonia, ammonium bicarbonate is produced, The ammonium bicarbonate then reacts with common salt forming sodium bicarbonate, Sodium bicarbonate being slightly soluble (in presence of sodium ions) gets precip..

The dual of any statement in a Boolean algebra is the statement obtained by interchanging + and ., and simultaneously inter-changing the elements 0 and 1 in the stateme..

Le Chatelier's Principle - The state of equilibrium in any system depends upon factors present in the system, such as temperature, pressure and concentration of various species. These factors are called reaction variables or parameters. A change in any one of the parameters may ..

If a system at equilibrium is subjected to a change in concentration, temperature or pressure, the equilibrium readjusts itself to counteract the effect of the applied change..

Physical Concept of Uncertainty Principle - To determine the position of an object, we must be able to see the object. This can be done with the help of light of suitable wavelength. When a beam of light falls on an object, the photons of this incident light are scattered by the object an..

Heisenberg, in 1927 pointed out that it is not possible to measure simultaneously both the momentum (or velocity) and the position of a microscopic particle with absolute accuracy. Mathematically this may be expressed..

When two or more wave motions traveling through a medium superimpose one another, a new wave is formed whose resultant displacement at any instant is equal to the vector sum of the displacement due to individual waves at that instant The two short lined waves traveling in opposite directio..

. An important example is that of a single pulse of oscillation: Such a single pulse would look like the central hump in the above figure and is called a wave packet. We shall now show how a wave packet can be built up out of a group of neighboring sine waves. Starting with the result in below figu..

It should be borne in mind that the uncertainty is not due to lack of sufficiently refined techniques but it is due to the fact that one cannot observe microscopic things without disturbing them. No instrument can observe the position of an electron without affecting its motion. In other word..