Write crystalline forms of carbon and write properties and
uses of diamond.
Answers
Explanation:
Diamond
Graphite
Properties of daimond
Hardness
Low coefficient of friction
High thermal conductivity
High electrical resistivity
Low thermal expansion coefficient
High strength
Broad optical transparency from ultra violet to infra red
Resistant to chemical corrosion
Biologically compatible
Graphite
has a high melting point, similar to that of diamond. In order to melt graphite, it isn't enough to loosen one sheet from another. You have to break the covalent bonding throughout the whole structure.
has a soft, slippery feel, and is used in pencils and as a dry lubricant for things like locks. You can think of graphite rather like a pack of cards - each card is strong, but the cards will slide over each other, or even fall off the pack altogether. When you use a pencil, sheets are rubbed off and stick to the paper.
has a lower density than diamond. This is because of the relatively large amount of space that is "wasted" between the sheets.
is insoluble in water and organic solvents - for the same reason that diamond is insoluble. tractions between solvent molecules and carbon atoms will never be strong enough to overcome the strong covalent bonds in graphite.
conducts electricity. The delocalised electrons are free to move throughout the sheets.
Uses of daimond
In the markets for gem grade