Colourless is a property, or word to describe matter, however the "gas" would be something you're describing. However, if a reaction is omitting a colourless gas, it could be considered a physical property of the reaction.
Substances can be described in two different ways: by chemical and physical properties. Chemical properties change the chemical nature of the matter, and physical properties do not. The fact that a substance is a gas at any temperature is a physical property.
Gas is a physical state, not a property. A gas can be converted into a liquid and then solid, a solid may be converted into a gas or liquid.
An element which is liquid at a certain temperature may be a gas at another temperature, this is called change of physical state.
Phase changes are physical. At least I think that's what you were looking for from this question. It's difficult to tell the way you worded it.
The state of matter is a physical property.
Gasoline is a material, a mixture of organic compounds - not a property !
Physical
chemical
Physical change, because no matter what the colour is, its still gasoline.
liquid to gas formation is physical change
flammability
melting is a physical property, not chemical property.
physical
No, it is a chemical property
Physical change, because no matter what the colour is, its still gasoline.
liquid to gas formation is physical change
No it is a chemical property
No, it is a chemical property
physical property
flammability
Gasoline has various chemical properties (particularly, it burns very well) and its combustion products have other chemical properties (they don't burn as well) but it would not be correct to say that gasoline in any sense BECOMES a chemical property. Chemicals have properties, they don't become properties.
chemical property
melting is a physical property, not chemical property.
Its a physical property as it is not involved with chemical reactions.
a physical property