If the jar is not completely full of water, and the air inside is not completely saturated, then yes, a little bit can.
It has nowhere to evaporate to. Evaporation is dispersion of molecules.
no
It depends what it is covered with. If it is covered with a cloth then, as the cloth is porous, the water will evaporate. If however you cover the bowl with something that seals the top (makes it air tight), it will not evaporate.
let the water evaporate and measure the salt that is left in the jar
From a sealed container or pipe water cannot be evaporated.
boil it, freeze it or leave it in a jar to evaporate
Heating favors evaporation.
Is it a mixture
The jar can not handle the temperature and compression so it cracks.
Water can be evaporated from a sealed container.
As the water boils, it creates steam which increases the pressure inside the sealed jar. This increased pressure causes the air inside the balloon to expand, filling more of the jar.
In a very sealed non -porous container water is not evaporated.