2. Allotropes of Carbon

3. Elemental carbon can exist in several different forms called ______________. Each allotrope had ___________________ properties. Why?

4. Allotropes of Carbon

5. Diamonds

6. Diamonds crystallize as a face-centered cubic crystal

7. Properties _______ covalent network structure. All carbons form ________________ bonds No plane of weakness making the diamond exceptionally hard. Are the electrons are localized or delocalized?

8. Diamond ctd: Form deep within the earths crust under extreme temp and pressure. Come to the surface via volcanoes. About a quarter of all Diamonds mined are used in jewellery. The rest are used in drilling and cutting equipment. ______________ in polar and non-polar solvents because molecular bonds are ________________ than any intermolecular forces

9. Graphite

10. Graphite: Each carbon makes _____ bonds. The 4 th pair of electrons are ____________ Built up from 2D layers.

11. Graphite ctd: Used in pencils. Illustration by Jennifer Parks, done in coloured pencil. Used in electrodes and batteries.

12. Properties of Graphite Different from Diamond Same as Diamond

13. Energy diagram for conversion of graphite to diamond Which is more stable? Is this reaction endothermic or exothermic?

14. Buckyballs Third allotrope of carbon. ___________________- named after an architect who popularized the geodesic dome. Consists of _______ carbons atoms arranged in hexagons and pentagons giving a geodesic spherical structure. ___________

15. Is able to partially conduct electricity. Why Can be used as a “cage” to transport and protect molecules.