Question

Q. Explain how to balance equations with steps and example.
Grade-10
Chapter- Chemical reaction and equation
Subject- Science ( Chemistry)
Points- 30
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Answer 1

So if you are asked to balance the chemical reaction.You will be given a chemical reaction with an LHS (reactant) and an RHS (product):

Step 1: first step is to count the no of atoms of each elements on both LHS and RHS.
Example:an easy one: N2+H2=＞ NH3

LHS:
No of atoms of N=2
No of atoms of H=2

RHS:
No of atoms of N=1
No of atoms of H=3

So this is an imbalanced,chemical equation.

Step 2: Multiply a number in LHS or RHS to make sure that no of atoms on LHS and RHS becomes same.

Since we need 2 N in RHS we multiply (NH3) by two so the equation becomes
N2+H2=＞2NH3

So new RHS:
No of atoms of N=2 (nitrogen is balanced on LHS and RHS)
No of atoms of H=6 (not balanced LHS has only 2)

To balance H we multiply H2 by three
So the equation becomes:

N2+3H2=＞2NH3

LHS:
No of atoms of N=2
No of atoms of H=6

RHS:
No of atoms of N=2
No of atoms of H=6

No of atoms in LHS and RHS balanced and equal.so tht is the balanced equation.

NOTE: For more no of elements in LHS and RHS the balancing gets difficult, keep practicing,its an important question from the examination point of view.