Question

Define a balanced chemical equation. Why should an equation be balanced?
(b) Write the balanced chemical equation for the following reaction:
(i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride.
(ii) Burning of natural gas.
(iii) The process of respiration.​

Answer 1

The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.

(i) P4 (s) + 10Cl2 (g) ———> 4PCl5 (S)

(i)CH4 (g) + 2O2 (g) ———> CO2 (g) + 2H2O(l) + heat energy

(iii) C6H12O6 (s) + 6O2 (g) + 6H2O

Answer 2

Answer:

(a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical reaction.

(b)

(i) P4 (s) + 10Cl2 (g) ———> 4PCl5 (S)

(ii)CH4 (g) + 2O2 (g) ———> CO2 (g) + 2H2O(l) + heat energy

(iii) C6H12O6 (s) + 6O2 (g) + 6H2O ———> 6CO2 (aq) + 12H2O (l) + energy