adding several fractions

If the impure compound is a mixture of two compounds whose solubility in any solvent does not differ significantly from one another, then the two compounds are separated by fractional crystallization. This is a series of repeated crystallisations. For instance when a solution containing ..

In the partial separation of heavy water from ordinary water, advantage is taken of the small difference in the boiling points of protium oxide (373.2 K) and deuterium oxide (374.3 K). Since the difference in boiling points is very small, a long fractionating column (about 13m) is used f..

What number should be added to the fraction - 5 6 to get the fraction 3 7 ? => - 53 42 or 56 45 or 53 42 or None of the above..

Crude oil or petroleum pumped out of an oil well, is a viscous and complex mixture of several hydrocarbons and small amounts of other compounds. It is not useful in this state. The 'refining of (crude) petroleum' involves the process of fractional distillation, whereby petroleu..

Emmigration is the permanent movement/departure of individuals of same species out of the local population due to several reasons such as lack of food, scarcity of space (over crowding), etc. Emmigration decreases the size of local population, but the species spread to new areas. If more..

Oil or fat is taken in a huge iron-pan called soap kettle and heated with open steam. 10% sodium hydroxide solution (lye) is added in a thin stream. The steam keeps the mass boiling and ensures thorough mixing as well. Saponification is complete after several hours to give a fr..

Modals - Modals are verbs which 'help' other verbs to express a meaning: "modal verbs" have no meaning by themselves. A modal verb such as would has several varying functions; it can be used, for example, to help verbs express ideas about the past, the present and the future. " would is n..

Petroleum is a mixture of hydrocarbons. On combustion, it produces mainly carbon dioxide and water vapour. However, on incomplete combustion, they produce carbon monoxide, unburnt hydrocarbons etc. They also produce oxides of nitrogen. Petrol is an important fraction of petroleum used in..

As mentioned earlier man's intervention is causing drastic changes in the environmental systems of earth and disturbing its ecological balance. This disturbance gets compounded with the problem of population explosion in the world especially the developing countries. The rate per annum at which the..

Interrelationship of Population, Environment and Development - As mentioned earlier man's intervention is causing drastic changes in the environmental systems of earth and disturbing its ecological balance. This disturbance gets compounded with the problem of population explosion in the world espec..