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.
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