Advertisements
Advertisements
Question
Explain the difference.
Crystalline and non-crystalline forms of carbon.
Solution
| Crystalline carbon | Non-crystalline carbon |
| A crystalline form has a regular and definite arrangement of atoms. | A Non-crystalline form does not have the regular arrangement of atoms. |
| Their melting point and boiling point are high and specific. | It melts at very high temperatures. |
| Crystalline carbon is a very hard substance. | Non-crystalline carbon is brittle. |
| A crystalline form has a definite geometrical shape, sharp edges and plane surfaces. | They are amorphous, hence, they do not have definite geometrical shape. |
| Diamond, graphite and fullerene are different crystalline forms of carbon. | Coal, charcoal and coke are different non-crystalline/amorphous forms of carbon. |
APPEARS IN
RELATED QUESTIONS
Choose the correct alternative.
A crystalline form of carbon is
Answer the following question
Why is diamond very hard?
Answer the following question
Explain the softness of graphite with reference to its structure.
Write three differences between graphite and diamond.
Fill in the blank
Wood charcoal is a..........conductor of heat and electricity.
Choose the correct alternative
Anthracite is
Write ‘true’ or ‘false’ against the following statement:
Activated charcoal is a good conductor of electricity.
Name the following:
The best variety of coal.
Name the following:
An amorphous form of carbon that contains about 98% carbon.
Name the products formed when:
graphite is subjected to high pressure and 3000°C temperature.
FILL IN THE BLANK
Graphite is a good conductor of .............
TRUE \ FALSE
Buckyball is a yellow amorphous solid.
What is the function of activated charcoal ?
What is water gas used for ?
State one use of each of the following:
Diamond, Graphite, Coke, Bone charcoal
State the reasons for use of graphite
(i) as a lubricant for heated machine parts,
(ii) as a lining for crucibles used in manufacture of high grade steel,
(iii) as an electrode in electroplating.
Give reason for the following:
Diamond & graphite are allotropic modifications of carbon.
The amorphous allotropic carbon is used for making electrodes in dry cell ______.
