What is the difference between chemical reaction & chemical equation ?

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Solution

A chemical reaction is a process that occurs when one or more reactants are changed into one or more new substances called products. Example: Hydrogen and oxygen gas combine to produce water.

A chemical equation is a symbolic representation of a chemical reaction where symbols of atoms are used to represent the elements that take part in a reaction. Numbers are used to represent the ratios of reactants and products to produce the reaction where the arrow points from reactants to products.
Ex: $2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (ℓ)$

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