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 that ionic crystals are made up of ions that are bonded by the electrostaticforce of attraction.
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.
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?
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?
Calcium forms a face-centered cubic cell with a density of 1.54 g/ml, what would its radius be in picometers?
Chapter 11 Solutions
Chemistry (Looseleaf) - With Student Solutions Manual
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
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