ICSE Class 9 Answered

Information convened by balanced chemical equation:

•  The substances take part in a chemical reaction and substances formed as a result of reaction.
• The number of atoms of each element participating in the reaction.
• The number of molecules of different substances taking part in the chemical reaction.

         For example:

         Zn + H₂SO₄  →  ZnSO₄  + H₂

Here one molecule of zinc, one molecule of sulphuric acid react to give one molecule of zinc sulphate and one molecule of Hydrogen.

• Composition of respective molecules i.e. one molecule of sulphuric acid contains two atoms of hydrogen, one atom of sulphur and four atoms of oxygen.
• Relative moleculer masses of different substances i.e. molecular mass of

          Zn= 65, H₂SO₄ (2+32+64) = 98

          ZnSO₄ (65+32+64) = 161

          H₂ = 2

• It tells about the volumes of gaseous reactants and products.

For example:     N₂    +    3H₂    →     2NH₃

                       1 Vol.      3Vol.           2 Vol.

1 Volume of Nitrogen

3 Volumes of hydrogen

2 Volumes of ammonia