Types of Chemical Reactions

Chemical reaction leads to the transformation of one set of chemical substances to another set of new substances.

Radical is positively or negatively charged component of a compound consisting of a single atom or groups of atoms.

Valency is the combining capacity of an element. It is the number of hydrogen atoms that combine with one atom of an element or the number of halogen atoms that combine with one atom of an element or twice the number of oxygen atom that combine with one atom of an element.

Chemical formula is the symbolic representation of a molecule of a compound.

Chemical equation is a brief notation of a chemical reaction in terms of symbols and formulae of substances involved in it instead of words representing it.

In a chemical equation, the total mass of all the elements on the reactant side should be equal to the sum of the masses of all the elements on the product side. A chemical equation written in this way is known as a balanced chemical equation.

Chemical reactions can be classified on the basis of physical state of the reactants and the product (homogeneous reactions or heterogeneous reactions), direction in which the reaction proceeds (irreversible reactions or reversible reactions), absorption or evolution of heat during the chemical reaction (exothermic reactions or endothermic reactions) and the nature of the chemical reaction.

The various types of chemical reactions are chemical combination (photosyntheis), thermal decomposition, simple displacement, double decomposition (neutralisation, precipitation) and oxidation reduction.

Activity series is an arrangement of metals in the decreasing order of their reactivities.

Substances can be purified by the methods like distillation and fractional distillation.

Melting point or boiling point of a substance indicates the degree of its purity.

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