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- Identify each solid as molecular, ionic, or atomic. c. Ni(s)
문제 4
문제 27
An X-ray beam with λ = 154 pm incident on the surface of a crystal produced a maximum reflection at an angle of θ = 28.3°. Assuming n = 1, calculate the separation between layers of atoms in the crystal.
- An X-ray beam of unknown wavelength is diffracted from a NaCl surface. If the interplanar distance in the crystal is 286 pm, and the angle of maximum reflection is found to be 7.23°, what is the wavelength of the X-ray beam? (Assume n = 1.)
문제 28
문제 29a
Determine the number of atoms per unit cell for each metal.
(a) Polonium
문제 29b
Determine the number of atoms per unit cell for each metal.
(b) Tungsten
문제 29c
Determine the number of atoms per unit cell for each metal.
(c) Nickel
- What is the packing efficiency of a body-centered cubic unit cell?
문제 31
- What is the packing efficiency of a face-centered cubic unit cell? Please show your work.
문제 32
문제 33
Platinum crystallizes with the face-centered cubic unit cell. The radius of a platinum atom is 139 pm. Calculate the edge length of the unit cell and the density of platinum in g/cm3.
문제 34
Molybdenum crystallizes with the body-centered unit cell. The radius of a molybdenum atom is 136 pm. Calculate the edge length of the unit cell and the density of molybdenum
문제 35
Rhodium has a density of 12.41 g/cm3 and crystallizes with the face-centered cubic unit cell. Calculate the radius of a rhodium atom.
문제 36
Barium has a density of 3.59 g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of a barium atom.
문제 37
Plonium crystallizes with a simple cubic structure. It has a density of 9.3 g/cm3, a radius of 167 pm, and a molar mass of 209 g/mol. Use these data to calculate Avogadro's number (the number of atoms in one mole).
- Palladium crystallizes with a face-centered cubic structure. It has a density of 12.0 g/cm³, a radius of 138 pm, and a molar mass of 106.42 g/mol. Use these data to calculate Avogadro's number.
문제 38
문제 39
Identify each solid as molecular, ionic, or atomic. a. Ar(s) b. H2O(s) c. K2O(s) d. Fe(s)
문제 40a
Identify each solid as molecular, ionic, or atomic. a. CaCl2(s)
문제 40b
Identify each solid as molecular, ionic, or atomic. b. CO2(s)
문제 40d
Identify each solid as molecular, ionic, or atomic. d. I2(s)
문제 41
Which solid has the highest melting point? Why? Ar(s), CCl4(s), LiCl(s), CH3OH(s)
문제 42
Which solid has the highest melting point? Why? C(s, diamond), Kr(s), NaCl(s), H2O(s)
문제 43
Which solid in each pair has the higher melting point and why?
a. TiO2(s) or HOOH(s)
b. CCl4(s) or SiCl4(s)
c. Kr(s) or Xe(s)
문제 43d
Which solid in each pair has the higher melting point and why? d. NaCl(s) or CaO(s)
문제 44
Which solid in each pair has the higher melting point and why?
a. Fe(s) or CCl4(s)
b. KCl(s) or HCl(s)
c. Ti(s) or Ne(s)
d. H2O(s) or H2S(s)
문제 46
An oxide of rhenium crystallizes with the unit cell shown here (rhenium=gray; oxygen=red). What is the formula of the oxide?
- Is the structure of each of the two unit cells shown in Problem 47 identifiable as the rock salt structure, zinc blende structure, fluorite structure, antifluorite structure, or is it none of these?
문제 49
문제 50
Identify the structure of each of the two unit cells shown in Problem 48 as the rock salt structure, zinc blende structure, fluorite structure, antifluorite structure, or none of these.
- Consider the rock salt structure in Figure 12.15. What type of structure would result if all the anions were somehow removed, leaving only cations?
문제 51
- Consider the zinc blende structure in Figure 12.16. What type of structure would result if the remaining tetrahedral sites in the unit cell were also filled with cations?
문제 52
문제 53a
Classify each of the following as a component of a silicate ceramic, an oxide ceramic, or a nonoxide ceramic. a. B4C
문제 53b
Classify each of the following as a component of a silicate ceramic, an oxide ceramic, or a nonoxide ceramic. b. Mg2SiO4