Chemistry - 2. Diamond and Graphite
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7 Terms
Why does diamond have a high melting point?
Giant covalent structure
strong covalent bonds between a carbon atom and 4 other carbon atoms
Lots of energy needed to break these bonds and so a high heat is required
Why is diamond hard?
A Giant tetrahedral structure where every carbon atom forms strong covalent bonds with 4 other carbon atoms.
Why does diamond not conduct electricity?
No free electrons available to carry a charge and form a current.
Why does graphite have a high melting point?
Giant covalent structure
Strong covalent bonds between a carbon atom and 3 other carbon atoms.
Lots of energy needed to break these bonds an so a high heat required.
Why is graphite soft/slippery/used as a lubricant in pencils?
Graphite is made of layers that have weak intermolecular forces between these layers. So layers can slide.
Why does graphite conduct electricity?
Every carbon atom has a delocalised electron that is free to move throughout the entire structure, carry a charge and form a current throughout the whole structure.
Why does graphite conduct heat?
Every carbon atom has a delocalised electron that is free to move and carry heat energy.