CHAPTER 21
Which of the following is a correct comparison of metals and semi-conductors? Select one:
Metals' resistance increases when temperature increases while a semi-conductors resistance decreases.
When we increase the temperature of the material
the conductivity of metals decreases whereas that of semi-conductors increases
Partially filled bands lead to materials that tend to
be opaque, be malleable, conduct heat well, conduct electricity well
Why are metals opaque? Select one:
because metals have empty, overlapping orbitals for their electrons
Metals have higher ionization energies than non-metals do. Select one:
false
Locate the elements palladium (Pd, atomic #46) and nickel (Ni, atomic #28) on the periodic table. If Pd is combined with Ni, which of the following characteristics will the product show at room temperature? Select one:
Shiny, malleable solid.
When you compare the band gap for a red and a blue LED, what is true? Select one:
The red LED has the smallest band gap.
Which of the following is NOT why alloys are useful to us today? Alloys Select one:
have a higher conductivity rate.