After 1 413 0C pure sodium chloride is vaporized without any residue.
Simple: the residue is dried sodium chloride.
Sodium chloride was left as residue under Detroit after Lake Michigan or one of the Great Lakes shrunk in size as residue.
After water evaporation sodium chloride (NaCl) remain as a solid residue.
If ammonium chloride and sand are heated or undergo sublimation, ammonium chloride being a sublimable substance sublimes and sand is left behind as the residue.
Sodium Chloride
Sodium chloride can be removed from solution by distillation. Boiling a solution of sodium chloride will cause the water to boil off and the sodium chloride to be left behind. If the water vapor is then condensed, the water obtained will be free of sodium chloride.
You can separate gold from sodium gold chloride by adding zinc powder to the sodium gold chloride and heating the mixture. Then you will be left with just gold.
A solid insoluble residue remain after the evaporation of water.
It is likely the substance was a salt such as sodium chloride or copper sulphate that was in solution. When the water evaporated it left the solid salts behind.
First add water to mixture the ammonium chloride will dissolve in the water but the iodine does not. Filter out the iodine using filtration then use evaporation or distillation to obtain the ammonium chloride.
Sodium chloride doesn't react with air; being hygroscopic NaCl absorb water from air.
the sodium chloride mixed with water will remove its from the sulfur in fact, the sodium chloride or salt will dissolve in the water, leaving the sulfur undissolved.
They separate at the boiling point of water, 100o Celsius, because the water boils away and the sodium chloride is left behind.