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Class: 10th
Subject: Chemistry
Chapter: Chemical Reactions And Equations
Topic Name: Balancing a Chemical Equation (1.8)
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Points covered in this video:-
Balancing a Chemical Equation:
Step I. Writing unbalanced equation and enclosing the formula.
Ex. Sodium metal reacts with water to produce Sodium hydroxide and
hydrogen gas.
(Na) + (H2O) 🠊 (NaOH) + (H2)
Step II. Making list of number of atoms of different elements as present in unbalanced equation.
Step III. Balancing first element – It is clear that it is only the hydrogen atoms, which are unbalanced. So, firstly try to balance it.
Step IV. Balancing second element – We examine the obtained equation and select another element which is still unbalanced. In the above equation, Na is still unbalanced. To balance the number of Na-atom.
Step V. Checking the correctness of equation – To check the correctness of the equation, we further tabulate the number of atoms of each element separately.
– Propane on combustion gives carbon dioxide and water vapour.
C3H8 + O2 CO2 + H2O
