Question

what is the chemical reactions and equations
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Answer 1

Answer:

A chemical reaction is described by a chemical equation, an expression that gives the identities and quantities of the substances involved in a reaction. A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow.

Answer 2

Chemical Reaction

The reaction in which new substances having properties & Composition different from the original substance , are formed are called chemical reaction.

Example :

$\bf \large \longrightarrow \:H_2 \: + \: O_2 \: \implies \: H_2O$

$\bf \large \longrightarrow \:Mg \: + \: O_2 \: \implies\: MgO$

Chemical Equations

Symbolic representation of chemical reaction is called chemical equation.

Example :

$\bf \large \longrightarrow \:CaCo_3 \: \implies \: CaO \: + \: Co_2$

$\bf \large \longrightarrow \: CaO \: + \: H_2O \: \implies \:CA ( OH )_ 2$