Why are the melting and boiling points of quartz very high?

Answer 1

Silicon dioxide * has a high melting point - varying depending on what the particular structure is (remember that the structure given is only one of three possible structures), but around 1700°C. Very strong silicon-oxygen covalent bonds have to be broken throughout the structure before melting occurs. * is hard. This is due to the need to break the very strong covalent bonds. * doesn't conduct electricity. There aren't any delocalised electrons. All the electrons are held tightly between the atoms, and aren't free to move. * is insoluble in water and organic solvents. There are no possible attractions which could occur between solvent molecules and the silicon or oxygen atoms which could overcome the covalent bonds in the giant structure. Giant covalent structures are arranged in a continuous lattice. This structure is very strong because of the strong forces between the molecules.

http://www.chemguide.co.uk/atoms/structures/giantcov.html

Answer 2

The high melting and boiling points of quartz are due to its strong covalent bonds formed between silicon and oxygen atoms. These bonds require a significant amount of energy to break, resulting in the high temperatures needed to melt or boil quartz. Additionally, the close packing arrangement of the atoms in the crystal structure contributes to its high melting and boiling points.

Answer 3

This is due to the large number of covalent bonds in quartz (also known as silicon dioxide) and strong covalent bonds within layers.

Answer 4

its melting point is extremely high in degrees Celsius as it has a very high mass in oxygen. this is because it is a rare metalloid and is a dioxide.

Answer 5

Yes the boiling and melting point of quartz is very high because of its compound network structure.

Answer 6

obsidian melting temp. of St. Helena,Ca.[found in]

Answer 7

This Is True.

Answer 8

True

Answer 9

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