Chapter 21: Problem 106
What is a ceramic, and what properties distinguish a ceramic from a metal?
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Chapter 21: Problem 106
What is a ceramic, and what properties distinguish a ceramic from a metal?
These are the key concepts you need to understand to accurately answer the question.
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Explain why early transition metals occur in nature as oxides but late transition metals occur as sulfides.
In a blast furnace, some of the \(\mathrm{CaSO}_{4}\) impurity in iron ore is reduced by carbon, yielding elemental sulfur and carbon monoxide. The sulfur is subsequently oxidized in the basic oxygen process, and the product reacts with \(\mathrm{CaO}\) to give a molten slag. Write balanced equations for the reactions.
What is ceramic processing?
How does the electron-sea model account for the malleability and ductility of metals?
Wide band gap semiconductors have a band gap between 2 and 7 electron volts \((\mathrm{eV})\), where \(1 \mathrm{eV}=96.485 \mathrm{~kJ} / \mathrm{mol}\). The wide band-gap semiconductor GaN, used to construct the laser in Bluray DVD players, has a band gap of \(3.44 \mathrm{eV}\). The material in the laser, \(\mathrm{Ga}_{x} \operatorname{In}_{1-x} \mathrm{~N}\), has some indium substituted for gallium. (a) What wavelength of light (in \(\mathrm{nm}\) ) would GaN emit, based on its band gap? (b) If the light from the device is blue, does partial substitution of indium for gallium increase or decrease the band gap of \(\mathrm{Ga}_{x} \mathrm{In}_{1-x} \mathrm{~N}\) compared to \(\mathrm{GaN}\) ?
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