Solid is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.

Gas. The atoms and molecules in gases are much more spread out than in solids or liquids. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Air is mostly gas It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

Liquids can only fill the bottom of a container, while gases can fill it entirely.

Nitrogen gas (N2) Oxygen gas (O2) Chlorine gas (Cl2) Fluorine gas (F2)

Examples of Gas to Liquid (Condensation) Water vapor to dew – Water vapor turns from a gas into a liquid, such as dew on the morning grass. Water vapor to liquid water – Water vapor forms water droplets on the glass of a cold beverage.

If both its normal melting point and its normal boiling point are below room temperature (20°C), the substance is a gas under normal conditions.

Oxygen

Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature.

Calcium chloride, CaCl2, is a typical ionic halide and is a solid at room temperature. Its molecular weight is 110.98 g/mol and its melting point is 772 °C.

So a substance that is a gas at room temperature is most likely a covalent substance. : In ammonia, the nitrogen atom shares electrons with the hydrogen atoms forming covalent bonds. So the intermolecular forces between the molecules are weak and we expect ammonia to be a gas at room temperature.

Originally Answered: SiO2 is a solid and CO2 is a gas at room temperature. Silicon dioxide is giant molecular. In (displayed formula: O=C=O), each molecule is attracted to other molecules because of what is called “van der Waal’s forces” or London forces.

Oxygen is more electronegative than carbon. Therefore, the oxygens pull the electrons towards themselves with the same force on either side of the carbon atom. These are very weak intermolecular forces that are overcome at room temperature. Thus, carbon dioxide molecules are able to move freely as a gas.

CO2 consists of individual molecules with one central carbon atom double bonded to two oxygen atoms. Silicon does not form double bonds with oxygen. Because of this reason CO2 is gas but SiO2 is solid.

Every oxygen atom is bonded to two silicon atoms. Whereas, 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. Because of this reason CO2 is gas but SiO2 is solid.

The key difference between SiO2 and CO2 is that the SiO2 exists in solid phase whereas, the CO2 exists in gaseous phase at standard temperature and pressure conditions. SiO2 is silicon dioxide. CO2 is carbon dioxide. Both silicon and carbon are group 14 elements in the periodic table of elements.

Dry Ice is the common name for solid carbon dioxide (CO2). It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).

Covalent Network Solids are giant covalent substances like diamond, graphite and silicon dioxide (silicon(IV) oxide).

In metallic solids and network solids, however, chemical bonds hold the individual chemical subunits together….12.5: Network Covalent Solids and Ionic Solids.

Silicon carbide is an example of a covalent solid. Covalent solid is a classification of crystalline solid.

It doesn’t apply to SiO2 because there is no such thing as an silica molecule. Silica, like many other minerals, is a 3D network of bonds with no discrete molecular components. In silica each Silicon is bonded to 4 Oxygens, but each oxygen is shared with two silicons. This gives the SiO2 formula.

1 Expert Answer Weakest IMF’s = most likely to be vaporized. This means that F2 has the weakest imf’s, and is easiest to vaporize, and is most likely to be a gas.

Fluorine is a pale yellow or light green gas with a sharp, penetrating odor. It is the most chemically reactive of all the gases and the most electronegative of all the elements.

metals