Why is the boiling point for SiO2 much higher than CO2 despite the fact they are in group 4 of periodic table?
Both are in group 4, valencys are the same. Si is heavier than C. Bonding seems to be the same but the boiling point is much higher for the SiO?
Answers:
The reason why silica has a high melting point is that it forms a giant structure with the silicon is bound to four oxygen atoms in an arrangement similar to diamond (tetrahedrally) with the silicon atoms placed between the oxygen atoms. It does this because the SiO2 had a significantly larger ionic character than carbon dioxide.
please don't ask us to "discuss".
just passing through with my hands over my eyes.
SiO2 is silicon dioxide (quartz) its a solid, co2 can only be a gas and solid you cant boil if it is possible it would be for that reason they both have different properties
solid vs gas/solid
thats right, the boiling point of CO2 is lower than the melting point which is why you dont get liquid CO2, ergo it is impossible to boil. think sublimation!
Bond energies are the reason.
The C=O double bond is very strong, much stronger than the C-O single bond (in fact it's one of the strongest bonds in nature, which is why CO2 is so stable)
The Si-O bond on the other hand is stronger than the Si=O bond.
This is partly because the p orbitals on Si and O differ in size and overlap poorly.
So SiO2 can exist as a polymer
O O
/ \ / \
Si Si Si
\ / \ /
O O
The equivalent form of CO2 would be unstable and decompose into O=C=O, which is a small molecule and therefore a gas
http://www.chm.davidson.edu/chemistryapp.
may work for you.
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Answers:
The reason why silica has a high melting point is that it forms a giant structure with the silicon is bound to four oxygen atoms in an arrangement similar to diamond (tetrahedrally) with the silicon atoms placed between the oxygen atoms. It does this because the SiO2 had a significantly larger ionic character than carbon dioxide.
please don't ask us to "discuss".
just passing through with my hands over my eyes.
SiO2 is silicon dioxide (quartz) its a solid, co2 can only be a gas and solid you cant boil if it is possible it would be for that reason they both have different properties
solid vs gas/solid
thats right, the boiling point of CO2 is lower than the melting point which is why you dont get liquid CO2, ergo it is impossible to boil. think sublimation!
Bond energies are the reason.
The C=O double bond is very strong, much stronger than the C-O single bond (in fact it's one of the strongest bonds in nature, which is why CO2 is so stable)
The Si-O bond on the other hand is stronger than the Si=O bond.
This is partly because the p orbitals on Si and O differ in size and overlap poorly.
So SiO2 can exist as a polymer
O O
/ \ / \
Si Si Si
\ / \ /
O O
The equivalent form of CO2 would be unstable and decompose into O=C=O, which is a small molecule and therefore a gas
http://www.chm.davidson.edu/chemistryapp.
may work for you.
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