Interpretation:
Carbon show unique properties, it forms very large number of molecules. Catenation is the linkage of atom of the same element in to form long chain, this property dominate in carbon atom. Due to which carbon forms very large number of compound. Carbon is capable of forming many allotropes due to its unique property. Well known forms of allotropes of carbon include diamond and graphite.
Concept introduction:
In diamond all the carbon atoms have strong
In graphite all the carbon atoms have strong chemical bonds to three other carbon atoms making sheets that look like chicken wire, weak forces hold the sheets together hybridisation of carbon atom in graphite is , but in diamond it is .
To determine: graphite can conduct electricity but diamond does not
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Chemistry: Structure and Properties
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- Most ceramic materials have low thermal conductivities because:(a) Electron mobility is strongly restricted due to their strong ionic-covalent bonding.(b) False, in general they are excellent thermal conductors (they are used in ovens).(c) Electron mobility is dependent on T and therefore they are poor conductors at high temperatures.(d) Electron mobility is very restricted by secondary bonds.arrow_forwardResistivity and electrical conductivity.(a) In metals, resistivity decreases.(b) In metals, resistivity decreases and conductivity in semiconductors also decreases with increasing temperature.(c) With increasing temperature, resistivity in metals and conductivity in semiconductors also increases.(d) None of the above.arrow_forwardState the difference between concrete and Portland cement.(a) There are no differences, in concrete the chemical composition is silicates and in cement aluminates.(b) The chemical composition of concrete is based on silicates and in cement aluminates.(c) Concrete is composed of aggregates bound by cement and cement "only" contains different minerals.(d) Cement is aggregates bound by concrete.arrow_forward
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