7 key concepts

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..

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

Summary - Matter is anything that occupies space. An Atom is the smallest particle of an element that takes part in a chemical reaction. A molecule is the smallest particle of a substance that has independent existence. Atomic mass unit is one-twelfth mass of an atom of carbon (C-12). It is equal t..

) The __________within the lock is unique that even a _________ 3) A three year-old girl could open the lock in Puri easily, after being helped to insert the lock into the key, because ______________ 4) Machine-made locks are preferred to handmade ones because ____________ 5) Singh has im..

Biodiversity is not uniformly distributed across the geographical regions of the earth. Norma Myers developed the hot spots concept in 1988 to designate priority areas for in-situ conservation. The hot spots are the richest and the most threatened reservoirs of plant and animal life on ea..

Angiosperms represent the most recent and the most advanced group of plants. Angiosperms have been of immense importance to humans, more than any other group. There have been several attempts to classify angiosperms. One of the earliest attempts was that of Carolus Linnaeus. He was the f..

fig 7.7 (a) - Lock and Key model of the interaction of substrate and enzyme. The active site of the enzyme alone is complementary in shape to that of the enzyme This model was proposed in the late 19 t h century. Since then, modern X-ray crystallographic and spectroscopic method..

Oersted's experiment shows that a current carrying wire exerts a force on a magnetic needle and deflects it from its usual north-south position. The reverse must also be true, which was proved by the French scientist Andre Marie Ampere, who suggested that a magnet must also exert an equal and oppo..

But the displacement when the bus moves from A B and then from B A is zero. SI unit of displacement is metre. Displacement is a vector, i.e., the displacement is given by a number with proper units and direction. To drive home the difference between displacement and distance let us consider a few m..

Fig: 8.7 - Concept of electrode potential So, an electrode develops a charge depending upon the nature of the process, which is favoured at the electrode. Due to separation of charges between the electrode and the solution, an electrical potential is set up between metal electro..