Powerpoint lecture covering the following in a modern, concise format:
Specification Point 1.44 - Know that a covalent bond is formed between atoms by the sharing of a pair of electrons.
Specification Point 1.45 - Understand covalent bonds in terms of electrostatic attractions.
Specification Point 1.46 - Understand how to use dot-and-cross diagrams to represent covalent bonds in a variety of molecules.
Specification Point 1.47 - Explain why substances with a simple molecular structures are gases or liquids, or solids with low melting and boiling points.
Specification Point 1.48 - Explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass.
Specification Point 1.49 - Explain why substances with giant covalent structures are solids with high melting and boiling points.
Specification Point 1.50 - Explain how the structures of diamond, graphite and fullerene influence their physical properties, including electrical conductivity and hardness.
Specification Point 1.51 - Know that covalent compounds do not usually conduct electricity.
Complete set of Chapter 3 Lectures are available.
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I can't stress how much better these presentations are than others I've seen; the molecules themselves must have taken hours to draw! Thank you!
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