Is formation of gas a chemical or physical change?

Answer 1

Physical, because the gas is still the same gas, just under pressure

Some gasses may undergo spontaneous chemical reactions under very high heat and/or pressure. For example ozone under high pressure will fairly rapidly decay into oxygen gas.

Answer 2

the condensation of gas into a liquid is physical eg. water vapor to water

for a chemical change to happen bonds must be broken until you get to A level and learn about van der walls forces

Answer 3

Gas at room temperature is not a change of any sort.

If you mean "Is being a gas at room temperature a chemical of physical property?" then it is a physical property.

Answer 4

The formation of gas is:
- a chemical process if the gas is the product of a chemical reaction
- a physical process if the gas is the product of a change of phase as sublimation and vaporization

Answer 5

Gas under pressure is not a change. Increasing the pressure is a physical change.

Answer 6

In away it's both but it really depends on how you look at it, in science it is chemical reaction! :)

Answer 7

That would be a physical change.

Answer 8

physical