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(a) What is chemical equation? Explain with the help of an example.
(b) Giving examples, state the difference between balanced and unbalanced chemical equations. (c) Balance the following chemical equations: (i) NH3 -----> N2 + H2 (ii) C + CO2 -----> CO
(a) The method of representing a chemical reaction with the help of symbols and formulae of substances involved is called a chemical equation.
Example: Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas.
This equation is written as:$Zn\ ( s) \ +\ H_{2} SO_{4} \ ( aq) \ \rightarrow \ ZnSO_{4} \ ( aq) \ +\ H_{2} \ ( g) +Heat$
(b) A balanced chemical equation must have an equal number of atoms of different elements in the reactants and products.
It has equal masses of various elements in the reactants and products. It follows the law of conservation of mass.
Example: $Zn\ ( s) \ +\ H_{2} SO_{4} \ ( aq) \ \rightarrow \ ZnSO_{4} \ ( aq) \ +\ H_{2} \ ( g) +Heat$
An unbalanced chemical equation does not have an equal number of atoms of one or more elements in the reactants and products.
It also has unequal masses of various elements in the reactants and products. It does not follow the law of conservation of mass.
Example: $H_{2} \ +\ O_{2\ }\rightarrow H_{2} O$
(c)The balanced chemical equations are given below:
(i) $2NH_{3} \ \rightarrow \ N_{2} \ +\ 3H_{2} \ $
(ii) $C+\ CO_{2} \ \rightarrow 2CO$
Updated on: 10-Oct-2022
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