Q1
A balanced equation ensures:
Aequal atoms of each element on both sides
Bequal number of molecules on both sides
Cequal number of compounds only
Dequal mass of only one element
CBSEClass 10 (CBSE)ScienceCh 1 · Topic 2
Balancing Chemical Equations
Learning to balance chemical equations to satisfy the law of conservation of mass.
Core concept
For example, the unbalanced equation H₂ + O₂ → H₂O has 2 hydrogen and 2 oxygen atoms on the left but only 2 hydrogen and 1 oxygen atom on the right; balancing it correctly gives 2H₂ + O₂ → 2H₂O, with 4 hydrogen and 2 oxygen atoms on both sides. Balancing equations is essential for accurately predicting the quantities of reactants needed and products formed in a reaction, a skill crucial for stoichiometry calculations in chemistry.
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• A balanced equation has equal atoms of each element on both sides.
• Balancing uses coefficients (numbers before formulas), never changing subscripts.
• Example: 2H₂ + O₂ → 2H₂O is the balanced form of the water-forming reaction.
• Balanced equations are essential for stoichiometry calculations of reactant/product amounts.