Answer for the worksheet on balancing the chemical equation:

1)   2Mg  + O₂  -->   2MgO

2)  N₂ + 3H₂ -->  2 NH₃

3)  2Al₂O₃ --> 4Al + 3O₂

4) Ca  +  2H₂O  -->  Ca(OH)₂  +   H₂

5) 4NH₃ +  5O₂-->4NO  + 6H₂O

Worksheet on balancing chemical equations

Balance the  chemical equations given below:


1) _____ Mg  +  _____ O₂  -->   _____  MgO

 2)_____N₂ +_____H₂ --> _____NH₃

3)_____Al₂O₃ --> _____Al + _____O₂

4)____ Ca  +  _____  H₂O  -->  _____  Ca(OH)₂  +   _____ H₂

5)_____NH₃ +  _____O₂--> _____NO  +  _____H₂O

Examples of Balancing Chemical Equations

Balance the chemical equation:
Fe  + H 2SO4 -------------> Fe2(SO4)3 + H2

Steps to Balance the above equation:

1. First write down the unbalanced equation
 Fe  + H 2SO4 -------------> Fe2(SO4)3 + H2

2. In The above equation the sulphate(SO4 ) stays together , so
we can replace SO4 with X , We can rewrite the above equation as :
 Fe  + H 2X -------------> Fe2(X)3 + H2

3. Let us count the number of atoms on each side of the equation:
Left hand side (L.H.S)        Right hand side (R.H.S)
   Fe =1                                           Fe = 2
   H =2                                            H =2
   X =1                                             X=3

4. First let us look at Fe , we have 1 on L.H.S and 2 on R.H.S,
so multiply Fe by 2 on L.H.S

2Fe  + H 2X -------------> Fe2(X)3 + H2

5. Next let us look at X we have 1 on L.H.S and 3 on R.H.S
so multiply X by 3 on L.H.S
2Fe  + 3H 2X -------------> Fe2(X)3 + H2

6. Always try to keep H and O at the end to balance.

Now let us look at H , we have 6 on the L.H.S and 2 on the R.H.S
so multiply H by 3 on the R.H.S

2Fe  + 3H 2X -------------> Fe2(X)3 + 3H2

7.Now the equation is balanced , so we can rewrite the whole equation by replacing X by SO4

2Fe  + 3H 2SO4 -------------> Fe2(SO4)3 + 3H2

How to Balance a chemical equation

Steps to Balance a chemical equation:

1.Write down the unbalanced chemical equation. 

2.Next note down the number of elements present on each side   of  the equation

3.Count the number of molecules present on each side of the equation.

4.Check weather there are same number of molecules of all elements are present on the reactants side as well as the products side

5. start with the element that has the largest number of atoms in a single compound

6. Add coefficients to the element or ion that needs to be increased .

7. Start by balancing one element at a time. Finally check if all the elements are balanced.

First write down the unbalanced chemical equation:

H2+ O2 ---------->H2O   

Count the number of atoms on both side of the equation 

Left hand side  (L.H.S)     Right hand side(R.H.S)

      H = 2                                           H =2

      O =  2                                          O  =1

Let us  start with Hydrogen (H) ,since there is 2 Hydrogen on both the sides of the equation  Hydrogen is balanced.

Next let us look at Oxygen (O) we have 2 on L.H.S and 1 on R.H.S ,so multiply Oxygen (O) by 2 on R.H.S

H2+ O2 ---------->2H2O 


Now the Oxygen is balanced both the sides , look at Hydrogen (H) the value of H has changed we have 2 H on L.H.S and 4 H on R.H.S , so we have to multiply H by 2 on L.H.S 


2H2+ O2 ---------->2H2O 
Now the equation is balanced