is the phenomenon where by an element exists in various forms but in the same physical state.
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Allotropes
are elements that exists in two or more different forms but in the same physical state.
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Allotropic forms of crystalline carbon
Graphite and Diamond
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Allotropic forms of amorphous carbon
Coal, Coke, Charcoal and Carbon black.
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Diamond
The purest form of naturally occurring carbon.
They are colorless, lusterless solids
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Properties of Diamond
1. It is the hardest substance known.
2. It has high melting point.
3. It is very dense and resistant to high temperature and chemical attack.
4. It is a non-conductor of electricity.
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Uses of Diamond
used industrially in drills. as abrasives to sharpen very hard tools. used for cutting glass and metals.
as jewelry. used as pivot support in precision instruments.
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Artificial Diamond
this is made by subjecting graphite to very high temperature and pressure in the presence of nickel or rhodium as catalyst
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Graphite
this is formed as a result of volcanic heat on coal deposits.
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Properties of graphite
1. It is soft and flakes easily.
2. It has high melting point but less dense than diamond.
3. It is a good conductor of electricity.
4. Graphite crystals are involved in bond formation.
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Uses of graphite
It is an excellent dry lubricant. It is often used as electrodes in electroplating and in dry cells. it is used to line crucibles for making high-grade steel and other alloys. it is mixed with clay and is used to make lead in pencils. it is used as black
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Acheson Process
its the industrial preparation of graphite by
heating coke in an electric furnace to a high temp. for about 20-30hrs. Air is excluded by covering the coke with sand
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Other cards in this set
Card 2
Front
are elements that exists in two or more different forms but in the same physical state.
Back
Allotropes
Card 3
Front
Graphite and Diamond
Back
Card 4
Front
Coal, Coke, Charcoal and Carbon black.
Back
Card 5
Front
The purest form of naturally occurring carbon.
They are colorless, lusterless solids
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