some important definitions

From the above observation, we find (i) sin A = cos B where A + B = 90 o \ Sine of an angle = Cosine of its complement sin A = cos (90 - A) o sin 40 o = cos (90 - 40) o = cos 50 o (ii) = tan A (iii) By Pythagoras theorem a 2 + b 2 = c 2 \ sin 2 A + cos 2 A = 1 These..

1 mole of an atom = 1 gram atomic weight of an atom 1 mole of a molecule = 1 gram molecular weight of molecule 1 mole of a gas = 22.4 liters of gas at STP 1 mole of a substance = 6.023 x 10 23 , atoms, molecules or ions 1 molar volume = 22.4 dm3 /L at ST..

By making a comparative study and assorting the similarities and differences amongst the various varieties of species, organisms can be classified into groups or sets. Taxonomy is a regular branch of science that is involved with the purpose of arranging or grouping organism..

Transpiration is responsible for uptake of water from the soil It is responsible for movement of water and dissolved minerals from the roots to different parts of the plant It results in cooling of the leaf surfaces, thereby protecting them from excessive hea..

Statement - A mathematical sentence which can be judged to be true or false is called a statemen..

Importance of Solubility Product - Solubility product is an important concept that is used in explaining phenomena like solubility and precipitation of compounds in analytical chemist..

Dipole moment plays very important role in understanding the nature of chemical bond..

Important Thermodynamic Terms - Some common terms, which are frequently used in the discussion of energetics need to be kno..

Ecological succession is of great importance as i) It provides information, which help to have control on the growth rate of one or more species in a given geographical area. ii) It helps in reforestation and forest management programm..

Many carbon compounds find applications in almost all aspects of our daily life as we have seen earlier. In this chapter two very important organic compounds ethanol and ethanoic acid are discusse..