amorphous → no definite structure or form, irregularly shaped solid
Crystalline quartz → highly structured, crystalline solid made of silica, SiO2
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
(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
(e) The atoms in amorphous silica do not pack as efficiently
in three dimensions as compared to the atoms in quartz.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Atomic, Ionic, and Molecular Solids concept. If you need more Atomic, Ionic, and Molecular Solids practice, you can also practice Atomic, Ionic, and Molecular Solids practice problems.