You need to cool it down.
That would change according to how much pressure it was under.
By far it is water.
That would be, "Water vapor" or "Steam", but not the "steam" that you see coming from a pan of boiling water - that is not steam, but rather, tiny droplets of liquid water.
Because when the salt is dissolved, the chemical makeup of the crystal changes, making it a chemical change. However, you can evaporate the water, capture all the steam, cool the steam, and then you have the salt (original chemical makeup) and the water, making it a physical change.
Steam is water and water is a compound - H2O. So I would say steam is a compound.
An example of liquid to gas would be water turning to steam without a change in temperature. This is known as vaporization.
There are many. But I would say the most common would be H2O. It is solid as "Ice" liquid as "Water" and gaseous as "Steam".
Greater latent heat in steam due to phase change.
physical change because you are not doing anything to the object to change its ingredients or the way it is constructed and all you are really doing is adding heat.
So specifically steam will form when you boil water. While water vapor forms when the sun evaporates water. Steam you would most likely see, while water vapor is more of an invisible gas.
Assuming enough heat is applied to the liquid for it to change phases, gas is what comes next. An example would be steam rising off of a pot of boiling water.
Yes quite possible. This occurs at the change of state. As water gets changed into steam heat will be supplied but the temperature would remain at the boiling temperature.