Covalent Bonding
1. This question has 3 part(s).
1.1. Covalent substances can be simple molecular covalent or giant covalent.
i) Ammonia is a simple molecular, covalent substance. Which is the most likely set of properties for ammonia?
(1)
melting point | boiling point | ability to conduct | ||
☐ | A | 1713 | 2950 | does not conduct |
☐ | B | −78 | −33 | does not conduct |
☐ | C | −39 | 357 | conducts |
☐ | D | 801 | 1413 | conducts |
ii) Ammonia, NH3, is made by reacting nitrogen with hydrogen. Write the balanced equation for this reaction.
(2)
1.2. Oxygen, O2, is also a simple molecular, covalent substance.
Draw a dot and cross diagram for the molecule of oxygen.
1.3. Figure 8 shows the arrangement of carbon atoms in diamond, graphene and a fullerene (C60).
Figure 8
Consider these three substances.
Explain, in terms of their structures and bonding, their relative melting points, strengths and abilities to conduct electricity.
Ai এর মাধ্যমে
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