Chapter 16: Q57E (page 704)
Selenium is a semiconductor used in photocopying machines. What type of semiconductor would be formed if a small amount of indium impurity were added to pure selenium?
The p-type semiconductor will be formed if a small amount of indium impurity is added to pure selenium
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How does each of the following affect the rate of evaporation of a liquid in an open dish?
a. intermolecular forces
b. temperature
c. surface area
A given sample of wüstite has the formula Fe0.950O1.00. Calculate the fraction of iron ions present as Fe3+. What fraction of the sites normally occupied by Fe2+must be vacant in this solid?
Argon has a cubic closest packed structure as a solid. Assuming that argon has a radius of 190 pm. Calculate the density of solid argon.
MnO has either the NaCl type structure or the CsCl type structure. The edge length of the MnO unit cell is 4.47×10-8 cm, and the density of MnO is 5.28 g/cm3.
a. Does MnO crystallize in the NaCl type or the CsCl type structure?
b. Assuming that the ionic radius of oxygen is 140. pm, estimate the ionic radius of manganese.
c. Does the calculated cation-to-anion radius ratio for MnO substantiate your answer in part a? Explain.
The compounds all can be describedas cubic closest packed anions with the cations in tetrahedral holes. What fraction of the tetrahedral holes are occupied for each case?
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