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MC test: Environmental impact - plastics
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Nanotechnology answers
Answers to Nanotechnology questions. 1. (a) Nanotechnology is the research and use of compounds whose size lies between one and one hundred nanometres (1 x 10−9 and 1 x 10−7 m). (b) A nanotube contains...
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Nanotechnology questions
1. (a) Explain what is meant by term ‘nanotechnology’. (b) Describe the basic structure of a nanotube in terms of graphene and buckminsterfullerene. (c) Discuss reasons why the rise in the use of nanoparticles...
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MC test: Nanotechnology
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Polymers answers
1. (a) Because the reaction is an addition reaction there are no other products formed so all the reactants are converted into the desired product. (b) Mass of 1000 H2N(CH2)6 NH2 = 1000 x 116.04 = 116040...
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Polymers questions
1. (a) Explain why the atom economy for most addition polymers is close to 100%. (b) Nylon 6,6 can be made by reacting 1,6-diaminohexane, H2N-(CH2)6-NH2, with hexanedioyl dichloride, ClCO-(CH2)4-COCl....
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MC test: Polymers
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Liquid crystals answers
1. (a) The cyanide group is polar (due to the difference in electronegativity between carbon and nitrogen). This ensures that the intermolecular forces are string enough to align in a particular direction....
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Liquid crystals questions
1. One compound in use in liquid crystal displays is 4-pentyl-4’-cyanobiphenyl. Explain the importance of the following features, which help to give the compound good liquid crystal properties: (a) the...
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MC test: Liquid crystals
To give your students access to this page you will need to change the default access from "OFF" to "ON". Use the following 'quiz' to test your knowledge and understanding of this sub-topic. As this relates...