Why?!.........structure Questions

Why SiO2 can form Giant covalent structure, but CO2 can't form Giant covalent structure, just can form simple molecular structure?

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Re: Why?!.........structure Questions

[quote="Poon"]Why SiO2 can form Giant covalent structure, but CO2 can't form Giant covalent structure, just can form simple molecular structure?[/quote]

In O=C=O the total bond energy is twice the value of a double CO bond. In a hypothetical CO2 lattice, the total bond energy is four times the value of a single CO bond. As it happens, twice the value of a double CO bond is [b]greater[/b] than four times the value of a single CO bond and so O=C=O is preferred.

In the hypothetical O=Si=O the total bond energy is twice the value of a double SiO bond. In the SiO2 lattice, the total bond energy is four times the value of a single SiO bond. As it happens, twice the value of a double CO bond is [b]less[/b] than four times the value of a single SiO bond and so a SiO2 lattice is preferred.

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