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Molecules and Networks
Carbon and Silicon Oxides
Carbon and silicon are both in group 4 of the periodic table.

CO2 is a gas at room temperature whereas SiO2 is a hard solid with a high melting point.

The reason for this difference in physical properties is the difference in bonding…

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Comparing properties

Carbon Dioxide CO2 Silicon Oxide SiO2
Gas at room temperature Solid at room temperature
Covalent Covalent
Small atom Large atom
Forms double bonds with oxygen Each silicon atom has a half share in four
oxygen atoms
Simple molecule Giant structure
Soluble in water Insoluble in water
Low boiling…


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