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ICSE Class 9 Chemistry Question 20 of 34

The Language of Chemistry — Question 24

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Question

Question 20

Give the names of the elements and number of atoms of those elements, present in the following compounds.

(a) Sodium sulphate

(b) Quick lime

(c) Baking soda

(d) Ammonia

(e) Ammonium dichromate

Answer

(a) Sodium sulphate
     Formula: Na2SO4
   ∴ It contains 2 atoms of Sodium (Na), 1 atom of Sulphur (S) and 4 atoms of Oxygen (O).

(b) Quick lime
     Formula: CaO
   ∴ It contains 1 atom of Calcium (Ca) and 1 atom of Oxygen (O).

(c) Baking soda
     Formula: NaHCO3
   ∴ It contains 1 atom of Sodium (Na), 1 atom of Hydrogen (H), 1 atom of Carbon (C) and 3 atoms of Oxygen (O).

(d) Ammonia
     Formula: NH3
   ∴ It contains 1 atom of Nitrogen (N) and 3 atoms of Hydrogen (H).

(e) Ammonium dichromate
     Formula: (NH4)2Cr2O7
   ∴ It contains 2 atoms of Nitrogen (N), 8 atoms of Hydrogen (H), 2 atoms of Chromium (Cr) and 7 atoms of Oxygen (O).