Question

why is CO2 a gas at room temperature,while SiO2is a solid??? please answer fast and thank you.

Answer 1

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CO2 exists as a discrete single molecule as O=C=O. and due to only van der waal's interactions the intermolecular forces are not strong enough, allowing the molecules move about freely, hence it exists as a gas.

SiO2 however actuall exists as a polymeric network as O-Si-O-Si......., here each Si atom is bonded to O atom by a single bond and also to 2 other O atoms making it strongly bonded. Due to this the intermolecular forces are tremendously high and molecules cannot move about freely, Hence SiO2 is a solid.

Answer 2

Explanation:

1.way.....CO2 consists of individual molecules with one central carbon atom double bonded to two oxygen atoms. Silicon does not form double bonds with oxygen. CO2 is gas but SiO2 is solid because the SiO2 is in giant molecular structure but the CO2 is simple molecular structure.

2.way..... carbon dioxide is a gas and silicon dioxide is a solid is because their chemical structures are different. Carbon dioxide is a linear structure with two double bonds between carbon and oxygen. It is a small molecule and non-polar with only weak bonds between the molecules. Hence it is a gas.

hope this help you.....

you write one of the two .....which one is sutiable for you...your write which you want...