20. Considering the thermodynamic steps in the Born-Haber cycle for the formation of Al2O3 from the elements, the factor most responsible for the stability of this salt is the .... A) bond energy of O2 B) lattice enthalpy C) exothermic electron affinities for oxygen D) ionization energies for aluminum E) none of the above

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Chapter1: Chemical Foundations
Section: Chapter Questions
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20. Considering the thermodynamic steps in the Born-Haber cycle for the formation of Al203 from the
elements, the factor most responsible for the stability of this salt is the ...
A) bond energy of O2
B) lattice enthalpy
C) exothermic electron affinities for oxygen
D) ionization energies for aluminum
E) none of the above
21. The addition of trace amounts of gallium to very pure crystalline silicon produces a material that
is...
a) a high-temperature superconductor
b) a metallic conductor
c) an n-type semiconductor
d) p-type semiconductor
22. This figure shows the temperature dependence of electrical resistivity for an inorganic solid. What
can you conclude about this solid?
a) It is an insulator at temperatures above about 100K
b) It is a metallic conductor at temperatures below about 100K
c) It is a semiconductor at temperatures above about 100K
d) It is a superconductor at temperatures below about 100K
100 200 300
Temperature, K -
but at 200K it undergoes
temperature it first lengthe
transition and noticeably contracts in size. Identify the phase transition.
23. As an iron wire is heated from
A) hexagonal close-packed to simple cubic lattice.
B) cubic-close packed to hexagonal close-packed.
C) body-centered cubic to cubic-close packed
D) hexagonal close-packed to body-centered cubic
E) none of the above
Resistivity
Transcribed Image Text:20. Considering the thermodynamic steps in the Born-Haber cycle for the formation of Al203 from the elements, the factor most responsible for the stability of this salt is the ... A) bond energy of O2 B) lattice enthalpy C) exothermic electron affinities for oxygen D) ionization energies for aluminum E) none of the above 21. The addition of trace amounts of gallium to very pure crystalline silicon produces a material that is... a) a high-temperature superconductor b) a metallic conductor c) an n-type semiconductor d) p-type semiconductor 22. This figure shows the temperature dependence of electrical resistivity for an inorganic solid. What can you conclude about this solid? a) It is an insulator at temperatures above about 100K b) It is a metallic conductor at temperatures below about 100K c) It is a semiconductor at temperatures above about 100K d) It is a superconductor at temperatures below about 100K 100 200 300 Temperature, K - but at 200K it undergoes temperature it first lengthe transition and noticeably contracts in size. Identify the phase transition. 23. As an iron wire is heated from A) hexagonal close-packed to simple cubic lattice. B) cubic-close packed to hexagonal close-packed. C) body-centered cubic to cubic-close packed D) hexagonal close-packed to body-centered cubic E) none of the above Resistivity
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