Chapter 12: Q12.83 P (page 496)
Besides the type of unit cell, what information is needed to find the density of a solid consisting of identical atoms?
Besides the type of unit cell, the molecular weight and the diameter of atoms should be known to find the density of solid consisting of the identical atoms.
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Before the phenomenon of surface tension was understood, physicists described the surface of the water as being covered with a โskin.โ What causes this skin-like phenomenon?
Which member in each pair of liquids has the higher vapour pressure at a given temperature? Explain.
(a) or (b) or (c) or
What is the strongest inter-particle force in each substance?
(a) (b) (c)
Liquid propane, a widely used fuel, is produced by compressing gaseous propane. During the process, approximately 15 kJ of energy is released for each mole of gas liquefied. Where does this energy come from?
In the photoelectric effect, the work function (ฮฆ) is the minimum energy a photon must have to remove an electron from a metal surface (see Problem 7.70). For a given metal, ฮฆ depends on how and where the photon strikes the crystal. Copper adopts the face-centered cubic structure. If the photon strikes perpendicular to the unit cellโs face, ฮฆ is 4.59 eV; if perpendicular to a plane tangent to an edge, ฮฆ is 4.48 eV; and if perpendicular to a plane tangent to a corner, ฮฆ is 4.94 eV (1 eV = ). Find the wavelength (in nm) of the lowest energy photon that can remove an electron from copper, and state how it strikes the unit cell.
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