State two examples in each case and write their chemical formulae: (3 marks)
(i) Molecules having one kind of atoms only.
(ii) Molecules having two different kinds of atoms.
(iii) Molecules having three different kinds of atoms.

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Solution

(i) Molecules having one kind of atoms only are Oxygen (O₂) and Hydrogen (H₂). (1 Mark)
(ii) Molecules having two different kinds of atoms are Methane (CH₄) and Ethane (C₂H₆). (1 Mark)
(iii) Molecules having three different kinds of atoms are Sodium Carbonate (Na₂CO₃) and Glucose (C₆H₁₂O₆). (1 Mark)

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