Chemistry for Engineering Students
3rd Edition
ISBN: 9781285199023
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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Chapter 8, Problem 8.15PAE
8.13 What is the coordination number of atoms in the diamond structure?
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3. On the basis of ionic charge and ionic radii given in Table 1, predict crystal structures for the
following materials: (
a. CaO (b) MnS (c) KBr (d) CsBr
b. Justify your selections.
Table 1: Ionic Radii for Several Cations and Anions
Ionic
Radius (am)
Ionic
Cation
Radius (nm)
Anion
0.053
Br
0.196
Ba?+
Ca?+
0.136
0.181
0.100
F
0.133
Cs*
0.170
0.220
Fe2+
0.077
0.140
Fe
0.069
0.184
K*
0.138
Mg
Mn2*
0.072
0.067
Na*
0.102
Ni+
0.069
Sit+
0.040
0.061
a Spinels are solids with the general formula
M²+ (M¹³+)₂ 04 (where M²+ and M¹³ are
3+
3+
metal cations of the same or different metals).
The best-known example is common magnetite,
Fe3O4 [which you can formulate as
(Fe³+)₂04].
(Fe²+)
A crystal of a spinel
Given its name, it is evident that magnetite is
ferromagnetic. How many unpaired electrons are
there in iron (II) and in iron(III) ions?
Iron(II) ion:
unpaired electron(s)
Iron(III) ion:
unpaired electron(s)
8.15 Polinium is the only metal that forms a simple cubic crystal structure. Use the fact that the density of polonium is 9.32 g/cm3 to calculate its atomic radius.
Chapter 8 Solutions
Chemistry for Engineering Students
Ch. 8 - Prob. 1COCh. 8 - • describe the arrangement of atoms in the common...Ch. 8 - • use bind theory to describe bonding in solids.Ch. 8 - Prob. 4COCh. 8 - Prob. 5COCh. 8 - Prob. 6COCh. 8 - Prob. 7COCh. 8 - • explain the connection between intermolecular...Ch. 8 - Prob. 9COCh. 8 - Prob. 10CO
Ch. 8 - Prob. 8.1PAECh. 8 - Why is the C 60form of carbon called...Ch. 8 - Prob. 8.3PAECh. 8 - Prob. 8.4PAECh. 8 - What is the relationship between the structures of...Ch. 8 - Use the web to look up information on nanotubes....Ch. 8 - Prob. 8.7PAECh. 8 - Prob. 8.8PAECh. 8 - Prob. 8.9PAECh. 8 - Using circles, draw regular two-dimensional...Ch. 8 - Prob. 8.11PAECh. 8 - Prob. 8.12PAECh. 8 - Prob. 8.13PAECh. 8 - Prob. 8.14PAECh. 8 - 8.13 What is the coordination number of atoms in...Ch. 8 - Prob. 8.16PAECh. 8 - Prob. 8.17PAECh. 8 - 8.16 Iridium forms a face-centered cubic lattice,...Ch. 8 - 8.17 Europium forms a body-centered cubic unit...Ch. 8 - 8.18 Manganese has a body-centered cubic unit cell...Ch. 8 - Prob. 8.21PAECh. 8 - 8.20 How many electrons per atom are delocalized...Ch. 8 - Prob. 8.23PAECh. 8 - Prob. 8.24PAECh. 8 - Prob. 8.25PAECh. 8 - 8.24 What is the key difference between metallic...Ch. 8 - Prob. 8.27PAECh. 8 - Prob. 8.28PAECh. 8 - 8.25 Draw a depiction of the band structure of a...Ch. 8 - Prob. 8.30PAECh. 8 - Prob. 8.31PAECh. 8 - Prob. 8.32PAECh. 8 - Prob. 8.33PAECh. 8 - Prob. 8.34PAECh. 8 - Prob. 8.35PAECh. 8 - Prob. 8.36PAECh. 8 - Prob. 8.37PAECh. 8 - Suppose that a device is using a 15.0-mg sample of...Ch. 8 - 8.35 What is an instantancous dipole?Ch. 8 - 8.36 Why are dispersion forces attractive?Ch. 8 - 8.37 If a molecule is not very polarizable, how...Ch. 8 - 8.38 What is the relationship between...Ch. 8 - Prob. 8.43PAECh. 8 - Prob. 8.44PAECh. 8 - 8.39 Under what circumstances are ion-dipole...Ch. 8 - 8.40 Which of the following compounds would be...Ch. 8 - 8.41 What is the specific feature of N, O, and F...Ch. 8 - Prob. 8.48PAECh. 8 - 8.43 Identify the kinds of intermolecular forces...Ch. 8 - Prob. 8.50PAECh. 8 - Prob. 8.51PAECh. 8 - Explain from a molecular perspective why graphite...Ch. 8 - 8.45 Describe how interactions between molecules...Ch. 8 - 8.46 What makes a chemical compound volatile?Ch. 8 - 8.47 Answer each of the following questions with...Ch. 8 - 8.48 Why must the vapor pressure of a substance be...Ch. 8 - Prob. 8.57PAECh. 8 - Prob. 8.58PAECh. 8 - Prob. 8.59PAECh. 8 - Suppose that three unknown pure substances are...Ch. 8 - 8.51 Suppose that three unknown pure substances...Ch. 8 - 8.52 Rank the following hydrocarbons in order of...Ch. 8 - Prob. 8.63PAECh. 8 - Prob. 8.64PAECh. 8 - Prob. 8.65PAECh. 8 - Prob. 8.66PAECh. 8 - Prob. 8.67PAECh. 8 - Prob. 8.68PAECh. 8 - Why is there no isotactic or syndiotactic form of...Ch. 8 - Prob. 8.70PAECh. 8 - Prob. 8.71PAECh. 8 - Prob. 8.72PAECh. 8 - 8.61 Distinguish between a block copolymer and a...Ch. 8 - Prob. 8.74PAECh. 8 - Prob. 8.75PAECh. 8 - Prob. 8.76PAECh. 8 - Prob. 8.77PAECh. 8 - 8.66 What structural characteristics are needed...Ch. 8 - Prob. 8.79PAECh. 8 - Prob. 8.80PAECh. 8 - Prob. 8.81PAECh. 8 - Prob. 8.82PAECh. 8 - Prob. 8.83PAECh. 8 - Prob. 8.84PAECh. 8 - Prob. 8.85PAECh. 8 - Prob. 8.86PAECh. 8 - 8.87 Use the vapor pressure curves illustrated...Ch. 8 - Prob. 8.88PAECh. 8 - 8.89 The following data show the vapor pressure of...Ch. 8 - Prob. 8.90PAECh. 8 - Prob. 8.91PAECh. 8 - Prob. 8.92PAECh. 8 - Prob. 8.93PAECh. 8 - Prob. 8.94PAECh. 8 - Prob. 8.95PAECh. 8 - 8.96 A business manager wants to provide a wider...Ch. 8 - 8.97 The doping of semiconductors can be done with...Ch. 8 - 8.98 If you know the density of material and the...Ch. 8 - Prob. 8.99PAECh. 8 - Prob. 8.100PAECh. 8 - Prob. 8.101PAECh. 8 - Prob. 8.102PAECh. 8 - 8.103 In previous chapters, we have noted that...Ch. 8 - Prob. 8.104PAECh. 8 - Prob. 8.105PAE
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- Which of the following statements is TRUE? Select one: CCl4(s) has a higher melting point than Fe(s). K2O is a molecular solid. The second ionization energy (IE2) for strontium is represented by the equation Sr(s) → Sr2+(g) + 2e- Glass is an example of a crystalline solid. The conduction band for insulators is always vacant.arrow_forwardWhich member of each pair is more metallic?(a) Na or Cs(b) Mg or Rb(c) As or Narrow_forwardExplain the term crystal radii?arrow_forward
- 17. Calculate the energy change in kJ/mol for the tollowing hucleal Peacions 14 4 17 (A)OSN + He > 2. O+ Harrow_forwardWhich of the following solids DOES NOT belong the group? Select one or more A. N2O4 B. SiC C. C2H2O4 D. S8arrow_forwardOn the basis of ionic charge and ionic radii given in Table 1, predict crystal structures for the following materials: a. Cao (b) MnS (c) KBr (d) CsBr b. Justify your selections. Table 1: Ionic Radii for Several Cations and Anions Ionic Radius (nm) Jonic Radias (am) Cation Anion AP 0.053 Br 0.196 Bu 0.136 0.181 0.100 0.133 Cs' 0.170 0.220 Fel Fe K' 0.077 0.140 0.069 0.184 0.138 Mg Mn. 0.072 0.067 Na 0.102 0.069 0.040 0.061arrow_forward
- Given the following thermodynamic data, calculate the lattice energy of LiCl:ΔH°f[LiCl(s)] = -409 kJ/molΔH°sublimation [Li] = 161 kJ/molBond energy [Cl-Cl] = 243 kJ/molIE1 (Li) = 520 kJ/molEA1 (Cl) = -349 kJ/mol -1682 kJ/mol -984 kJ/mol -1560 kJ/mol -862 kJ/mol -1213 kJ/molarrow_forward5. Explain why lattice enthalpy calculations based on the Bom-Mayer equation reproduce the experimentally detemined values to 99% for LICI but only 91% for AgCl?arrow_forward3. Calculate the radius of tantalum atom, given that Ta has a BCC crystal structure, a density of 16.6 g/cm?, and an atomic weight of 106.4 g/mol.arrow_forward
- The thiocyanate ion, SCN‒, can form bonds to metals through either S or N (see Problem 5.23). What is the likelihood of cyanide, CN‒, forming bonds to metals through N as well as C?arrow_forwardIf galena (Pbs) was defined by metallic bonds ,calculate the radius ratio between the two elements and give the name of the resulting structurearrow_forward4. Briefly explain why chemically similar alkali metal chlorides, NaCl and CsCl, have different crystalline structures, while MnS and NaCl pack in the same crystalline structure.arrow_forward
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