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Chemistry questions

Number of Words : 1499

Number of References : 9

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This paper answers the following questions – <br />1/ Explain the fundamental reasons why ceramics are brittle and metals are tough. <br />2/ Explain why glass generally has low tensile strength and briefly describe two methods by which it can be ''strengthened''.<br />3/Explain, in terms of Griffith's equation, why steel is a ''safer'' engineering materials than glass.<br />4/ Explain the differences between elastic deformation, uniform plastic deformation and local plastic deformation (necking).<br />5/ Describe the mechanism of rubber elasticity, explaining how it leads to low stiffness and high extensions.<br />6/ Explain how the combination of thermosetting resin and glass fibres, both of which are brittle, gives composite materials which are tough.<br />

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AKey : C-7940

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