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Chemical Reaction Formula

Chemical reactions are represented by chemical equations, which identify reactants and products. Formulas of reactants appear on the left side of the equation those of products are written on the right. In a balanced chemical equation, there are the same number of atoms of a given element on both sides.

The steps involved in writing the chemical reaction is
  1. Write a "skeleton" equation in which the formula of the reactants appear on the left and those of the products on the right.
  2. Indicate the physical state of each reactant and product, after the formula by writing (g) for gaseous, (l) for liquid, (s) for solids and (aq) for ions in aqueous solution.
  3. Balance the equation.
Any calculation involving a reaction must be based on the balanced equation for that reaction. The equation cannot be written unless we know what happens in the reaction that it represents.

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Chemical Reaction Problems

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Solved problems based on chemical reaction are given below.

Solved Examples

Question 1: Two liquid reactants hydrazine and dinitrogen tetraoxide reacts to form gaseous nitrogen and water vapor. Write the chemical reaction for this process.
1. Write a skeleton equation in which the reactants are on left and products on right side.

N2H4 + N2O4 $\rightarrow$ N2 + H2O

2. Indicate the physical state after the formula for reactant and products.

N2H4(l) + N2O4(l) $\rightarrow$ N2(g) + H2O(g)

3. Balance the equation.

2N2H4(l) + N2O4(l) $\rightarrow$ 3N2(g) + 4H2O(g)

This is the final balanced equation for the reaction of hydrazine with dinitrogen tetraoxide.


Question 2: Crystals of sodium hydroxide react with carbon dioxide from air to form a colorless liquid, water and a white powder, sodium carbonate which is commonly added to detergents as a softening agent. Write a balanced equation for this chemical reaction.
1. Write the skeleton equation for this reaction in which reactants on left side and products on right side.

NaOH + CO2 $\rightarrow$ Na2CO3 + H2O

2. Represent the physical state after the formulas of reactants and products.

NaOH(s) + CO2(g) $\rightarrow$ Na2CO3(s) + H2O(l)

3. Balance the chemical equation.

2NaOH(s) + CO2(g) $\rightarrow$ Na2CO3(s) + H2O(l)

This is the final balance equation for the reaction between sodium hydroxide and carbon dioxide in air.


More topics in Chemical Reaction Formula
Limiting Reactant Formula Theoretical Yield Formula
Activation Energy Formula Combustion Formula
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