Question

why is carbon dioxide a gas but wood a solid ​

Answer 1

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Here is your answer...,

Carbon dioxide is a molecular crystal, and the atoms are bonded together by a covalent bond.

Silicon dioxide is an atomic crystal. Although it is written as silicon dioxide, there is no single molecule inside it, and the atoms are bonded together by a covalent bond.

So…..The strength of covalent bonds is much greater than that of intermolecular forces, so the combination of SiO2 is relatively close and firm, and is solid at normal temperature, but the force between CO2 molecules is small, so it is gas at room temperature.

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Answer 2

Because oxides exist in gas and wood exists in all 2 states - wood and gas(when burnt)