Amorphous silica, SiO2, has a density of about 2.2 g/cm3,whereas the density of crystalline quartz, another form ofSiO2, is 2.65 g/cm3. Which of the following statements isthe best explanation for the difference in density?(a) Amorphous silica is a network-covalent solid, but quartzis metallic.(b) Amorphous silica crystallizes in a primitive cubic lattice.(c) Quartz is harder than amorphous silica.(d) Quartz must have a larger unit cell than amorphoussilica.(e) The atoms in amorphous silica do not pack as efficientlyin three dimensions as compared to the atoms in quartz.
Amorphous silica, SiO2, has a density of about 2.2 g/cm3,whereas the density of crystalline quartz, another form ofSiO2, is 2.65 g/cm3. Which of the following statements isthe best explanation for the difference in density?(a) Amorphous silica is a network-covalent solid, but quartzis metallic.(b) Amorphous silica crystallizes in a primitive cubic lattice.(c) Quartz is harder than amorphous silica.(d) Quartz must have a larger unit cell than amorphoussilica.(e) The atoms in amorphous silica do not pack as efficientlyin three dimensions as compared to the atoms in quartz.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
Amorphous silica, SiO2, has a density of about 2.2 g/cm3,
whereas the density of crystalline quartz, another form of
SiO2, is 2.65 g/cm3. Which of the following statements is
the best explanation for the difference in density?
(a) Amorphous silica is a network-covalent solid, but quartz
is metallic.
(b) Amorphous silica crystallizes in a primitive cubic lattice.
(c) Quartz is harder than amorphous silica.
(d) Quartz must have a larger unit cell than amorphous
silica.
(e) The atoms in amorphous silica do not pack as efficiently
in three dimensions as compared to the atoms in quartz.
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