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Question

Write down symbols or formulae for the following:
(a) an atom of sodium
(b) a molecule of nitrogen
(c) a molecule of oxygen
(d) a molecule of water
(e) a molecule of iron oxide
(f) a molecule of carbon dioxide
(g) a molecule of copper sulphide
(h) a molecule of calcium oxide
(i) a molecule of calcium chloride


Solution

(a) an atom of sodium: Na
(b) a molecule of nitrogen: N2
(c) an atom of oxygen: O
(d) a molecule of water: H2O
(e) a molecule of iron oxide: FeO
(f) a molecule of carbon dioxide: CO2
(g) a molecule of copper sulphide: CuS
(h) a molecule of calcium oxide: CaO
(i) a molecule of calcium chloride: CaCl2

Science
Active Science
Standard VII

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