Combination reaction

A combination reaction or a synthesis reaction is a general category of a chemical reaction (the term usually refers to an inorganic chemical reaction), in which two or more reactants are chemically bonded together to produce a single product. When two or more substances combine to form a single product, it is known as a combination reaction. Many elements react with one another in this fashion to form compounds.

This reaction is usually exothermic because when the bond forms between the reactants, heat is released.

A combination reaction can be of three types:

Type	Example
a) Between two elements	C + O2 → CO2	Carbon completely burnt in oxygen yields carbon dioxide
b) Between two compounds	CaO + H2O → Ca(OH)2	Calcium oxide (lime) combined with water gives calcium hydroxide (slaked lime)
c) Between an element and a compound	O + H2O → H2O2	Oxygen (an element) combined with water (a compound) yields hydrogen peroxide

When a combination reaction occurs between a metal and a nonmetal the product is an ionic solid. An example could be Lithium + Sulphur → Lithium Sulphide

When magnesium metal burns in air to produce magnesium oxide, a combination reaction occurs between magnesium and the diatomic oxygen molecule. This specific combination reaction produces the bright flame generated by flares.

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