NCERT Questions

Class 10
Chapter 1 Class 10 - Chemical Reactions and Equations

## What is a balanced chemical equation? Why should chemical equations be balanced?

A balanced chemical equation has an equal number of atoms of different elements in reactants and products.

No. of atoms of elements in Reactants = No. of atoms of elements in Products

For eg,

Fe 2 O 3 + 2Al  →  Al 2 O 3 + 2Fe

 Name of the Element No. of atoms in reactants No. of atoms in products Iron 2 2 Oxygen 3 3 Aluminium 2 2

Number of atoms of Fe in reactants = Number of atoms of Fe in products = 2

Number of atoms of O in reactants = Number of atoms of O in products = 3

Number of atoms of Al in reactants = Number of atoms of Al in products = 2

• An unbalanced chemical equation is not an accurate representation of a chemical equation and thus it requires balancing.
• Chemical reactions should be balanced in order to obey the law of conservation of mass , which states that mass can neither be created nor be destroyed.
• Hence, the total mass of substances before the chemical reaction should be equal to the total mass of reactants after the reaction .

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