The main use of noble gases is due to their chemical inertness and low boiling points. Important uses of noble gases are as follows: Uses of Helium (He) It is used in inflating the tyres of big aero-planes as it is lighter than air. It is used for filling observation balloons due to its non-inflammability. … Read more
The ionization energy depends upon the following factors: A) Size of the atom The ionization energy depends on the distance between the electron and the nucleus i.e., size of the atom. The attractive force between the electron and the nucleus is inversely proportional to the distance between them. Consequently, as the size of the atom … Read more
Elemental oxygen exists as a triatomic molecule (O3) known as ozone in addition to di-oxygen. The existence of an element in more than one modification in the same physical state is referred to as allotropy. Ozone is an allotropic form of oxygen which is present in the upper atmosphere about 20 km above the surface … Read more
It is a metallic silicate of various metals. It is a hard, transparent, amorphous and super-cooled liquid. It is an important industrial material which is used in our daily life. It is prepared by heating a mixture of silica, sodium carbonate and calcium carbonate in a furnace. Characteristics It is a hard, transparent homogenous mixture … Read more
Introduction to Covalent bond In 1916, G.N Lewis suggested that atoms may combine with one another by mutual sharing of their valence electrons. Due to this, the combining atoms attain the nearest noble gas configuration in their valence cells. These shared pairs of electrons are situated exactly or nearly at the midpoint of the combining … Read more
1. It is a designed apparatus where electrolysis is carried out. It is an experimental set up or advice where chemical energy is converted into electrical energy. 2. This cell consists of a glass vessel or made up of any suitable plastic material, in which two electrodes are dipped into an electrolyte solution. Two electrodes … Read more
S.N Nuclear fission Nuclear fusion 1. The reaction in which a single heavy nucleus splits into two or more light nuclei is called nuclear fission reaction. 0n1 +92U235 → 56Ba141 +36Kr92 +30n1 + E The reaction in which two or more light nuclei combine to form a single heavy nucleus is called nuclear fusion reaction. … Read more
S.N Name Oxidation number of N Physical appearance Uses 1. Nitrous oxide (N2O)/laughing gas +1 colourless gas neutral non-irritating sweet smelling 1. used as local anaethesia and analgesics for small surgical operation. 2. fuel additive in car racing 3. helps in … Read more
When the reactants of a chemical reaction are completely reacted to form products, then the heat evolved or absorbed is called the heat of reactions. Heat of reactions are of various types depending upon the nature of reaction. It must be defined for one mole. The various types of heat of reactions are as follows: … Read more
A binary compound of oxygen with another element is known as an oxide. There are various types of oxides. They are as follows: A) Basic oxides: It is formed with alkali metals, alkaline earth metals (except Be) and transition metals generally. These oxides give bases with water. These oxides react with acids to form salt … Read more