Question

(a) What is a 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

Answer 1

Answer:

an equation where the reactants and products are written in chemical name is called chemical equation

H2+O2=H2O

a balanced equation can show no. of reactants and products taking part but unbalanced equation do not show that

Answer 2

Reactants Equal Products in Balanced Equation

Explanation:

• (a) The method of representing a chemical reaction with the help of symbols and formulae of substances involved in it 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:  

$Zn + H_2SO_4 ---> ZnSO_4 + H_2$  

• (b) A balanced chemical equation has 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.

Example:   

• An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reactants and products.
• It has unequal masses of various elements in the reactants and products.

c.) Balancing of Equation-

i) $2NH_3 --> N_2 + 3H_2$

ii) $C + CO_2 --> 2CO$