balancing chemical equations
TRANSCRIPT
Chemical Equations
• The chemical reactions are represented by Chemical Equations.
• It has two parts :
1. Reactants (Left hand side)
2. Products (Right hand side)
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.
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.
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.
Example 1
Consider an equation,
H2
+ O2 = H
2O
LHS H = 2, O = 2,
RHS H = 2, O = 1
H
H
O
O
H H
O
HH
BalancingIn order to balance, we now add 2 to the RHS, making it as 2H2O, Now, equatin becomes as
H2
+ O2 = 2H
2O
LHS, H = 2, O =2
RHS, H= 4, O= 2
H
H
O
O
OH H
O
H H
O
BalancingH is not equal , hence add 2 to the H of LHS, forming
2H2
+ O2 = 2H
2O
HH
O
O
OH H
O
H H
OH H
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
Step 1 : Adding 3 to Ba in RHS, we have
Ba3N
2 + H
2O → 3Ba(OH)
2 + NH
3
LHS RHS
Ba = 3 Ba = 3
N = 2 N = 1
H = 2 H = 9
O = 1 O = 6
Step 2 : Adding 2 to N in RHS, we have
Ba3N
2 + H
2O → 3Ba(OH)
2 + 2NH
3
LHS RHS
Ba = 3 Ba = 3
N = 2 N = 2
H = 2 H = 12
O = 1 O = 6
Step 3 : Adding 6 to H2O in RHS, we have
Ba3N
2 + 6H
2O → 3Ba(OH)
2 + 2NH
3
LHS RHS
Ba = 3 Ba = 3
N = 2 N = 2
H = 12 H = 12
O = 6 O = 6
Hence, it is balanced.
You can find it more easier without
guessing,
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/balancing-equations.php