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Section 4.3. IB Chem exit slip Consider the chemical CBr 4 Draw the lewis structure What shape does it form? Does it contain any polar bonds (if so how.

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Presentation on theme: "Section 4.3. IB Chem exit slip Consider the chemical CBr 4 Draw the lewis structure What shape does it form? Does it contain any polar bonds (if so how."— Presentation transcript:

1 Section 4.3

2 IB Chem exit slip Consider the chemical CBr 4 Draw the lewis structure What shape does it form? Does it contain any polar bonds (if so how many?) Is it a polar molecule? Why or why not?

3 Understanding/Application and skills Carbon and silicon form giant covalent/network covalent/macromolecular structures. Explanation of the properties of giant covalent compounds in terms of their structures. Guidance: Allotropes of carbon (diamond, graphite, graphene, C60 buckminsterfullerene) and SiO 2 should be covered. http://www.chemguide.co.uk/atoms/structures/giantcov.html

4 Giant molecular crystalline solids Also known as network covalent structure or macromolecular structure Different from other covalent substances because they are not discrete molecules – they form a crystalline lattice in which the atoms are linked together by covalent bonds. Effectively a single molecule with a regular repeating pattern of covalent bonds (no finite size)

5 Allotropes of carbon Diamonds Graphite Graphene Fullerene

6 Silicon https://www.youtube.com/watch?v=PiYnQLI- ufU https://www.youtube.com/watch?v=PiYnQLI- ufU Silicon – structure is a lattice similar to diamond Each Si is bonded to 4 others

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