Chapter 22: Q16P (page 966)
Question: The mixed oxide ceramic has zero electrical resistance at 125 K. Calculate the average oxidation number of the copper in this compound if x = 0.50 and thallium is in the +3 oxidation state.
Answer
The average oxidation number of copper is 2.33.
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When the LED described in Problem 33 has the composition (i.e., x 5 0.86), the band gap has increased to . Determine the wavelength and color of the light emitted by this LED.
Question: Suppose some people are sitting in a row at a movie theater, with a single empty seat on the left end of the row. Every 5 minutes, a person moves into a seat on his or her left if it is empty. In what direction and with what speed does the empty seat “move” along the row? Comment on the connection with hole motion in p-type semiconductors.
Question: Silicon nitride resists all acids except hydrofluoric, with which it reacts to give silicon tetrafluoride and ammonia. Write a balanced chemical equation for this reaction.
Question: Iron oxides are red when the average oxidation state of iron is high and black when it is low. To impart each of these colors to a pot made from clay that contains iron oxides, would you use an air-rich or a smoky atmosphere in the kiln? Explain.
Draw a Lewis electron-dot diagram for the disilicate ion What changes in this structure would be necessary to produce the structure of the pyrophosphate ion and the pyrosulfateion . What is the analogous compound of chlorine?
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