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Système International dâUnités. Internationally agreed coherent system of units: distance in metre (m), mass in kilogram (kg), time in second (s), current strength in ampere (A), temperature in kelvin (K), quantity of a substance in mole (mol) and strength of light in candela (cd) etc.
the heat of reaction or the change in heat when reactants form products during a chemical...
a pair of electrons shared between two atoms in a covalent bond.
a reaction in which heat is absorbed from the surroundings and the temperature of the reaction...
a method of separating mixtures based on differences in their boiling points.