Combination Reaction - Edu Foundation

COMBINATION REACTION

The reaction in which two reactants combined with each other to form a single product under suitable conditions is called combination reaction. In this reaction, Release of heat takes place for which it is also called as exothermic reaction. Oxidation reaction is also called combination reaction as it involves combination of one element with oxygen. Combination reactions are quite often known as synthesis because in these reactions, new substances are synthesised. All the compounds which are formed as a result of the combination reactions, are actually synthesised.

Illustration of a combination reaction with the help of an activity:

In order to illustrate a combination reaction, take about 2g to 3g of calcium oxide (also called quick lime) in a glass beaker. Pour water over it very slowly. What do you observe?
The reaction is highly vigorous as well as exothermic. It is accompanied by hissing noise and bubbles. In fact, solution initially starts boiling. In this reaction, calcium hydroxide (also known as slaked lime) is formed as a result of combination between two compounds.

Cao(s) + H2o(aq) -> CA(oh)2(s)

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