summary or key concepts

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

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..

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..

Is Matter Around us Pure - Summary Matter is anything that occupies space and has mass Element is a pure substance, which can neither be decomposed nor built from simpler substances by any physical or chemical means. It contains only one kind of atom. Broadly speaking, elements can be div..

In physics, the concept of energy plays the role of the money. Work is transferred to or from an object by means of force acting on the body. Energy transferred to the body is positive work and the energy transferred from the body is negative wor..

Ode to the West Wind is a poem addressed to the west wind. It is personified both as a "Destroyer" and a "Preserver". It is seen as a great power of nature that destroys in order to create, that kills the unhealthy and the decaying to make way for the new and the fresh. The personification of t..

Protein synthesis is a controlled process in which a given protein is synthesised in the cell only when it is necessary. When a particular protein is to be synthesised the specific gene has to express and initiate transcription. The mechanism that stimulates the expression of certain genes ..

>t h century necessitated a thorough modification in the system of classification. A more systematic and scientific system called natural system of classification emerged. It was based on specific similarities and differences between organisms. The earliest attempt towards a natural system came fro..

>Strength of a base depends on the concentration of hydroxyl ions. A strong base dissociates completely in water. Example: Sodium hydroxide A weak base dissociates partially in water. Example: Ammonium hydroxide The acidity of a base is equal to the number of hydroxyl ions it has. Monoacidic base- ..

Example: Sodium hydroxide A weak base dissociates partially in water Example: Ammonium hydroxide In neutralization reaction acids and bases neutralize each other to form corresponding salts and water Acidic and basic solutions yield ions in solutions and so are good conductors of electr..