A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz, or SiO 2 ), and iodine. The results of her investigations are: (a) W is a good electrical conductor; X, Y, and Z are poor electrical conductors, (b) When the solids are hit with a hammer, W flattens out, X shatters into many pieces, Y is smashed into a powder, and Z is not affected, (c) When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W, and Z do not melt, (d) In treatment with 6 M HNO 3 , X dissolves; there is no effect on W, Y, or Z. On the basis of these test results, identify the solids.
A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz, or SiO 2 ), and iodine. The results of her investigations are: (a) W is a good electrical conductor; X, Y, and Z are poor electrical conductors, (b) When the solids are hit with a hammer, W flattens out, X shatters into many pieces, Y is smashed into a powder, and Z is not affected, (c) When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W, and Z do not melt, (d) In treatment with 6 M HNO 3 , X dissolves; there is no effect on W, Y, or Z. On the basis of these test results, identify the solids.
Solution Summary: The author explains the different types of solids: crystalline and amorphous.
A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz, or SiO2), and iodine. The results of her investigations are: (a) W is a good electrical conductor; X, Y, and Z are poor electrical conductors, (b) When the solids are hit with a hammer, W flattens out, X shatters into many pieces, Y is smashed into a powder, and Z is not affected, (c) When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W, and Z do not melt, (d) In treatment with 6 M HNO3, X dissolves; there is no effect on W, Y, or Z. On the basis of these test results, identify the solids.
Europium crystallizes in a bcc cubic lattice.
a. If the atomic radius of a europium atom is 231 pm, what is the volume of a unit cell of europium in cubic centimeters?
b. If the density of europium is 5.25 g/cm3 at 20°C, what is the mass (in grams) of one unit cell?
RbBr has a face-centered cubic unit cell in which the Br- anions occupy corners and face centers, while the cations fit into the hole between adjacent anions. What is the radius of Br- if the ionic radius of Rb+ is 160.8 pm and the density of RbBr is 3.350 g/cm3?
What is the simplest formula of a solid containing A, B, C atoms in a cubic lattice in which A atoms occupy the corners, the B atom is the body-centered position, and the C atoms the faces of the unit cell?
Chapter 12 Solutions
Aleks 360 Access Card (1 Semester) For Chemistry: Atoms First
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Unit Cell Chemistry Simple Cubic, Body Centered Cubic, Face Centered Cubic Crystal Lattice Structu; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=HCWwRh5CXYU;License: Standard YouTube License, CC-BY