Chemical Equations Balancing

1
Balancing Chemical Equations
2
Chemical Equations

• The chemical reactions are represented by
  Chemical Equations.
• It has two parts
• 1. Reactants (Left hand side)
• 2. Products (Right hand side)

3
Balancing Chemical Equations

• A chemical equation needs to be balanced in order
  to obey the Law of Conservation of Energy.
• Law of Conservation of Energy states that matter
  can never be created, nor destroyed.
• Hence, we balance equations by adding
  coeffiecients in front of reactants and products.

4
How to Balance Chemical Equation?

• Step 1 Write the Formula for the equation.
• Step 2 Compare the number of atoms in left side
  with the right side.
• Step 3 Analyse where to place the coefficients,
  so as to make left and right side equal.
• Step 4 Verify finally, if all the atoms in left
  and right side are equal.

5
Rules

• Only the coefficients should be changed.
• Subscripts should not be changed. Changing it
  will change the compound.
• The coefficients should be whole numbers
• The lowest possible whole number should be used
  as coefficients.

6
Example 1

• Consider an equation,
• H2 O2 H2O
• LHS H 2, O 2,
• RHS H 2, O 1

O
O
H
H
H
H
H
O
H
7
Balancing

• In order to balance, we now add 2 to the RHS,
  making it as 2H2O, Now, equatin becomes as
• H2 O2 2H2O
• LHS, H 2, O 2
• RHS, H 4, O 2

O
O
O
H
H
H
O
H
O
H
H
8
Balancing

• H is not equal , hence add 2 to the H of LHS,
  forming

2H2 O2 2H2O
H
H
O
O
O
H
H
O
O
H
H
H
H
9
Example 2

• Ba3N2 H2O ? Ba(OH)2 NH3
• LHS RHS
• B a 3 Ba
  1
• N 2 N
  1
• H 2 H
  5
• O 1 O
  2

10

• Step 1 Adding 3 to Ba in RHS, we have
• Ba3N2 H2O ? 3Ba(OH)2 NH3

LHS RHS Ba
3 Ba 3 N 2
N 1 H 2
H 9 O 1
O 6
11

• Step 2 Adding 2 to N in RHS, we have

Ba3N2 H2O ? 3Ba(OH)2 2NH3
LHS RHS Ba
3 Ba 3 N 2
N 2 H 2
H 12 O 1
O 6
12

• Step 3 Adding 6 to H2O in RHS, we have

Ba3N2 6H2O ? 3Ba(OH)2 2NH3
LHS RHS Ba
3 Ba 3 N 2
N 2 H 12
H 12 O 6
O 6 Hence, it is
balanced.
13

• You can find it more easier without
• guessing,

14

• Click the compounds you want from the
• table and click calclate, you will yield the
• balanced equation from the
• chemicalequation balancer.
• https//www.easycalculation.com/chemistry/balanci
  ng-equations.php