Chemistry: Structure and Properties (2nd Edition)
2nd Edition
ISBN: 9780134293936
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 12, Problem 78E
Interpretation Introduction
To determine: Why KCl has greater melting point than copper iodide though separation between cation and anion in KCl is greater than that of CuI.
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8. An element with atomic mass 106.3amu crystallizes in a face–centered cubic unit cell. Its density is 12.9 g/cm3 at 27°C. Calculate the atomic radius of an atom of the element in centimeters.
The figure below depicts a plane of atoms of radius R in some crystal. The plane intersects the atoms through their centers.
Therefore, we do not see atoms above and below this plane. We just see the circular cross-sections of the atoms that lie within the plane.
If we consider only simple cubic (SC), body-centered cubic (BCC), and face-centered cubic (FCC) crystal structures as options,
and we have no more information to rely on, what are the possible identities for the plane shown above?
Select the plane family and crystal structure pair that is consistent with the plane shown above (select two of the options below).
Hint: Convince yourself of your response by sketching out the corresponding unit cell faces that lie on this plane.
{100} SC
(100) BCC
[100] FCC
(110) SC
(110) BCC
(110) FCC
(111) SC
(111) BCC
{111) FCC
The elements xenon and gold both have solid-state structures consisting of cubic close-packing arrangements of atoms. Yet Xe melts at -112℃ and gold melts at 1064℃. Account for these greatly different melting points.
Chapter 12 Solutions
Chemistry: Structure and Properties (2nd Edition)
Ch. 12 - What is graphene? Why is graphene unique?Ch. 12 - Prob. 2ECh. 12 - What is a crystalline lattice? How is the lattice...Ch. 12 - Prob. 4ECh. 12 - Prob. 5ECh. 12 - What is the difference between hexagonal closest...Ch. 12 - What are the three basic types of solids and the...Ch. 12 - Prob. 8ECh. 12 - What kinds of forces hold each of the three basic...Ch. 12 - Prob. 10E
Ch. 12 - In an ionic compound, how are the relative sizes...Ch. 12 - Prob. 12ECh. 12 - Show how the fluorite structure accommodates a...Ch. 12 - Prob. 14ECh. 12 - Prob. 15ECh. 12 - Prob. 16ECh. 12 - Prob. 17ECh. 12 - Prob. 18ECh. 12 - Prob. 19ECh. 12 - Describe the difference between vitreous silica...Ch. 12 - Prob. 21ECh. 12 - Prob. 22ECh. 12 - Prob. 23ECh. 12 - Prob. 24ECh. 12 - What is a polymer? What is the difference between...Ch. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - An X-ray beam of unknown wavelength is diffracted...Ch. 12 - Prob. 29ECh. 12 - Determine the coordination number for each...Ch. 12 - Calculate the packing efficiency of the...Ch. 12 - Prob. 32ECh. 12 - Prob. 33ECh. 12 - Molybdenum crystallizes with the body-centred unit...Ch. 12 - Rhodium has a density of 12.41 g / cm3 and...Ch. 12 - Barium has a density of 3.59 g/cm3 and...Ch. 12 - Prob. 37ECh. 12 - Palladium crystallizes with a face-centered cubic...Ch. 12 - Prob. 39ECh. 12 - Identify each solid as molecular, ionic, or...Ch. 12 - Which solid has the highest melting point? Why?...Ch. 12 - Which solid has the highest melting point? Why?...Ch. 12 - Which solid in each pair has the higher melting...Ch. 12 - Which solid in each pair has the higher melting...Ch. 12 - Prob. 45ECh. 12 - Prob. 46ECh. 12 - The unit cells for cesium chloride and barium(ll)...Ch. 12 - Prob. 48ECh. 12 - Prob. 49ECh. 12 - Prob. 50ECh. 12 - Prob. 51ECh. 12 - Consider the zinc blende structure in Figure 12.14...Ch. 12 - Prob. 53ECh. 12 - Prob. 54ECh. 12 - Prob. 55ECh. 12 - What are the name and formula of the compound...Ch. 12 - Prob. 57ECh. 12 - Prob. 58ECh. 12 - Prob. 59ECh. 12 - Prob. 60ECh. 12 - Prob. 61ECh. 12 - How many molecular orbitals are present in the...Ch. 12 - Prob. 63ECh. 12 - Prob. 64ECh. 12 - Prob. 65ECh. 12 - Prob. 66ECh. 12 - Prob. 67ECh. 12 - Prob. 68ECh. 12 - Prob. 69ECh. 12 - Saran, the polymer used to make saran wrap, is an...Ch. 12 - One kind of polyester is a condensation copolymer...Ch. 12 - Nomex, a condensation copolymer used by...Ch. 12 - Prob. 73ECh. 12 - Polyacrylonitrile (PAN) is an addition polymer...Ch. 12 - Prob. 75ECh. 12 - Prob. 76ECh. 12 - Prob. 77ECh. 12 - Prob. 78ECh. 12 - Prob. 79ECh. 12 - Prob. 80ECh. 12 - Prob. 81ECh. 12 - The density of an unknown metal is 12.3 g/cm3 and...Ch. 12 - An unknown metal is found to have a density of...Ch. 12 - Prob. 84ECh. 12 - Prob. 85ECh. 12 - Prob. 86ECh. 12 - Prob. 87ECh. 12 - Prob. 88ECh. 12 - Prob. 89ECh. 12 - Prob. 90ECh. 12 - Prob. 91ECh. 12 - Perovskite is a compound with a cubic unit cell...Ch. 12 - Prob. 93ECh. 12 - Despite Dalton's laws, it is now known that many...Ch. 12 - During the glass manufacturing process, the liquid...Ch. 12 - Why are X-rays used for crystallography? Why not...Ch. 12 - Compare the crystal structure of diamond (C) and...Ch. 12 - Prob. 98ECh. 12 - Prob. 99ECh. 12 - Have each group member select one of the cubic...Ch. 12 - Prob. 101ECh. 12 - Prob. 102ECh. 12 - Prob. 103ECh. 12 - Prob. 104ECh. 12 - Prob. 105ECh. 12 - Prob. 1SAQCh. 12 - A crystalline solid has a body-centered cubic...Ch. 12 - Prob. 3SAQCh. 12 - Prob. 4SAQCh. 12 - Prob. 5SAQCh. 12 - Prob. 6SAQCh. 12 - Prob. 7SAQCh. 12 - Prob. 8SAQCh. 12 - Prob. 9SAQCh. 12 - Prob. 10SAQCh. 12 - Prob. 11SAQCh. 12 - Prob. 12SAQCh. 12 - Prob. 13SAQCh. 12 - Prob. 14SAQCh. 12 - Prob. 15SAQ
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- • describe the arrangement of atoms in the common cubic crystal lattices and calculate the packing efficiency for a lattice.arrow_forward8.13 What is the coordination number of atoms in the diamond structure?arrow_forwardPhase diagrams for materials that have allotropes can be more complicated than those shown in the chapter. Use the phase diagram for carbon given here to answer the following questions. (a) How many triple points are present and what phases are in equilibrium for each? (b) Is there a single point where all four phases are in equilibrium? (c) Which is more stable at high pressures, diamond or graphite? (d) Which is the stable phase of carbon at room temperature and 1 atmosphere pressure?arrow_forward
- Describe the crystal structure of Pt, which crystallizes with four equivalent metal atoms in a cubic unit cell.arrow_forwardA compound of cadmium, tin, and phosphorus is used in the fabrication of some semiconductors. It crystallizes with cadmium occupying one-fourth of the tetrahedral holes and tin occupying one-fourth of the tetrahedral holes in a closest packed array of phosphide ions. What is the formula of the compound? Explain your answer.arrow_forward22. Palladium (Pd) crystallizes in a face-centered cubic lattice with an edge length of 388.8 pm. What is the density of palladium (in g/cm³)? (Molar mass of Pd: 106.42 g/mol; 1 pm = 10-12 m; 1 cm = 10-² m; Avogadro's number: 6.022 x 10²3) %3D a) 0.752 b) 3.01 c) 1.50 d) 6.01 e) 12.0 f) none of the abovearrow_forward
- An element has a density of 10.25 g/cm3 and a metallic radius of 136.3 pm. The metal crystallizes in a bcc lattice. Identify the element.arrow_forwardSuppose that a crystal lattice is composed of a structure where anions, X, occupy all of the corners in each cell a cation, M, occupies the central octahedral hole. The formula for the compound is MX MX2 O M2X O MX3 M3X2arrow_forwardCopper iodide crystallizes in the zinc blende structure. The separation between nearest neighbor cations and anions is approximately 311 pm, and the melting point is 606 °C. Potassium chloride, by contrast, crystallizes in the rock salt structure. Even though the separation between nearest-neighbor cations and anions is greater (319 pm), the melting point of potassium chloride is higher (776 °C). Explain.arrow_forward
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