Question

Define the chemical equation?

Answer 1

Chemical equations are symbolic representations of chemical reactions that express the reactants and products in terms of their chemical formulae. Symbols are also used to denote things like the reaction's direction and the physical states of the responding entities. In the year 1615, the French chemist Jean Beguin was the first to formulate chemical equations.

Complete answer:
Chemical formulae and symbols are used to represent chemical reactions in these equations. The reactants are on the left-hand side of a chemical equation, and the products are on the right-hand side. A symbol that represents the reaction's direction separates these elements. The stoichiometric coefficient for each reacting entity is also assigned.
The symbol ( $s$ ) describes an element in the solid state.
The symbol ( $l$) denotes the liquid state of an element.
The symbol ( $g$ ) implies that the element is in the gaseous state.
The ( $aq$ ) symbol corresponding to an element in a chemical equation denotes an aqueous solution of that entity.
Chemical reactions can be expressed with the use of chemical equations, such as the one shown below.
$2{H_2}(g) + {O_2}(g) \to 2{H_2}O(l)$
One of the four symbols below can be used to separate the reactants and products (for which chemical formulae are stated in chemical equations).
To describe a net forward reaction, the symbol ‘ $\to$ ’ is used.
To describe a state of chemical equilibrium, the symbol ‘ $\rightleftharpoons$ ’ is used.
In order to denote stoichiometric relationships, the ‘ $=$ ’ symbol is used.
To describe a reaction that occurs in both forward and backward directions, the symbol ‘ $\rightleftarrows$ ’ is used.

Note:
It's also important to note that each of the symbols for the respective reactants and products has a coefficient associated with it. The exact value of the stoichiometric number for each entity in a chemical equation is represented by these coefficients.