(a)
Interpretation: The structures of the given
Concept introduction: Copolymer is defined as
(b)
Interpretation: The structures of the given copolymer are to be drawn.
Concept introduction: Copolymer is defined as polymers whose repeating structural units are derived from two or more types of monomer units. Polyesters are polymers of an acid, benzene-1, 4-dicarboxylic acid
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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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