A liquid have random particles but they are still all joined together.
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No. The chemical structure of ethyl alcohol gas is the same as ethyl alcohol liquid.
No, the change from liquid to gas is a physical change, not a chemical change. In this process, the substance's molecular structure remains the same, only its physical state changes from liquid to gas.
Liquid water become gaseous water; the chemical structure is not changed.
One example of an object that can't dissolve in a liquid is a metal spoon. The chemical structure of the metal composing the spoon does not allow it to break apart and mix with the liquid, so it remains intact.
A liquid is a compound or a mixture; the chemical composition is representative for this liquid.