Question

Enlist the steps to write the chemical equations.

Answer 1

The steps to write the chemical equation-

• The reactants are always written on the left-hand side in a chemical equation with a plus sign (+) between them.
• The products are always written on the right-hand side in a chemical equation with a plus sign (-) between them.
• An arrow ($\to$) is placed between the reactants and the products to indicate the direction in which the reaction is taking place.
• In certain reactions have a reversible arrow ($\rightleftharpoons$) between the reactants and the products to indicate that the reaction can proceed in either direction.
• In a chemical equation, the physical state of reactants and products is indicated as follows-
• Solid state is indicated by the symbol (s).
• Liquid state is indicated by the symbol (l).
• Aqueous solution, i.e. the solution made in water is indicated by the symbol (aq).
• Gaseous state is indicated by the symbol (g).
• Any gas evolved during a reaction is represented by an arrow pointing upward ($\uparrow$) proceeding to the chemical formula.
• A precipitate formed during a reaction is represented by an arrow pointing downward ($\downarrow$) proceeding the chemical formula.
• An exothermic reaction is indicated by ‘+ Heat’ on the product side.
• An endothermic reaction is indicated by ‘+ Heat’ on the reactant side.
• Sometimes the pressure, temperature, and catalyst used in the reaction are also indicated in the chemical equation by writing them above or below the arrow sign.
• Example -

$\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Hydrogen}}{3{\mathrm{H}}_2\left(\mathrm{g}\right)}\underset{200\mathrm{atm}}{\overset{450°\mathrm{C}}{\to }}\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3\left(\mathrm{g}\right)}$