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7 February, 04:39

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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  1. 7 February, 04:45
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    E. The atoms in amorphous silica do not pack as efficiently in three dimensions as compared to the atoms in quartz.

    Explanation:

    Quartz is a crystalline structure with a lattice which is very compact and produces flat faces that align with one another causing high density.

    Silica has covalent bonding and forms a network structure. Silica, SiO2 is an amorphous solid and does not posses the same lattice or crystalline structure as Quartz, making it less dense.
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