How can a soild be changed to a gas?

Answer 1

Most substances are changed from solid to liquid to gas by heating until the intermolecular forces are overcome by the kinetic energy of the molecules. In some cases, a compound can be changed directly from a solid to a gas in a process called sublimation. This can occur if the atmospheric pressure exerted on the substance is too low to stop the molecules from escaping from the solid state. Common examples of this are dry ice (solid CO2) converting to a vapor, or the process of freeze drying, which causes the sublimation of water.

Answer 2

Gas burning is a combustion reaction.

E.g.

CH4 + 2O2 -> CO2 + 2H2O

The "gas" reacts with oxygen to form new compounds (carbon dioxide and water).

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It is a chemical change in which the gas (methane) fuel is burnt with oxygen from the atmosphere to produce carbon dioxide, water and heat.

Each carbon atom in the fuel has four hydrogen atoms attached and so its molecular weight is 16. In the combustion process each carbon atom is united with two oxygen atoms of atomic weight 16, to produce CO2 with a molecular weight of 44. In addition, the four atoms of hydrogen are united with two further oxygen atom to produce two water atoms each with a molecular weight of 18.

Therefore 16 kg of gas reacts with 64 kg of oxygen to produce 44 kg of carbon dioxide and 36 kg of water.

Answer 3

Matter changes chemically when it is involved in a reaction that produces a new substance. An example of chemical change is rusting of an iron nail.

Answer 4

A gas, on its own, is not an example of chemical change. Though it can undergo one.

Answer 5

Yes, chemical reactions

Answer 6

yes