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### Theory:

A chemical equation is a short description of a chemical reaction using chemical symbols and formulae.
Every chemical equation contains two parts:

1. Reactants:
Participate substances in a chemical reaction
2. Products:
Formed substances in a chemical reaction
Example:

The above reactions $$CH_4$$ and $$2O_2$$ substances participate in a chemical reaction, so these are named reactants.
The above reactions $$CO_2$$ and $$2H_2O$$ substances are formed in a chemical reaction, named products.
The steps involved in writing the skeleton equation:

A skeletal equation is written before the balanced equation of a chemical reaction is written.
Example:
The steps for writing the skeletal equation are listed below.

$\mathit{Mg}+{H}_{2}{\mathit{SO}}_{4}\to {\mathit{MgSO}}_{4}+{H}_{2}↑$

Step 1: Write the symbols and formulae of each reactant on the left-hand side (LHS) and connect them by plus (+) sign.

$$Mg$$  +  $$H_2SO_4$$
Here Mg and $$H_2SO_4$$ are reactants connected by the plus (+) sign.

Step 2: Followed by an arrow ($\to$) which is interpreted as gives or forms.

Step 3: Write the symbols and formulae for each product on the arrow's right-hand side (RHS).
Here $$MgSO_4$$ + $$H_2$$ $↑$are formed products.

Step 4: If the product is a gas, it should be denoted by an upward arrow ($↑$), and a precipitate should be indicated by a down arrow ($↓$).

Step 5: This written equation is called the skeleton equation (unbalanced equation).