This question is about elements and compounds. Some properties of graphite, oxygen and carbon monoxide are shown in Table 3.1. (i) Explain why graphite conducts electricity when solid. ......................................................................................................................................... . ................................................................................................................................... (ii) Complete the dot-and-cross diagram in Fig. 3.1 of a molecule of oxygen. Show outer shell electrons only. Fig. 3.1 (iii) Deduce the physical state of carbon monoxide at $$\(-195^{\circ} \mathrm{C}\)$$. Use the data in Table 3.1 to explain your answer. physical state .................................................................................................................. explanation ..................................................................................................................... ......................................................................................................................................... . (iv) Explain in terms of structure and bonding why graphite has a much higher melting point than carbon monoxide. ......................................................................................................................................... . ......................................................................................................................................... . ......................................................................................................................................... . ...................................................................................................................................

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