Sodium chloride at room temperature is a crystalline transparent substance.
Heating NaCl at 801 0C the salt is melted.
It is not necessary to be especially careful when heating sodium chloride.
The color remain unchanged.
Physical
Dissolving of NaCl is considered a chemical process.
Ammonium chloride may be released by heating.
It is a physical change.
When NaCl is dissolved in a jar, it undergoes a physical change. This is because the chemical composition of NaCl remains the same, but its physical state changes from a solid to a liquid solution. The salt can be reclaimed by evaporating the liquid and it would still have the same chemical properties as the original NaCl.
View the Related Link below for a common picture of Physical Changes.
no, it is more safe to use water bath :)
Dissolving is a physical process.
chemical