Question

What happens when you heat iodine and ammonium chloride

Answer 1

Iodine and Ammonium chloride are sublimate particles. On heating they start sublimating,that is they directly convert to gas without entering into liquid state.

Definition of Sublimation:- The process bytes which a solid directly changes to gas without changing into liquid is callle sublimation. A sublimate particle doesn't leave ash while sublimation.

Examples:- Campher, Napthelene balls, Iodine, Ammonium chloride, solid carbon dioxide etc.

$\textbf{Can We Change Sublimated}$
$\textbf{Particles Back To Their}$
$\textbf{Solid State?}$

The answer is yes. The vaporised particles can be condensed or deposited to form their solids. This process is called as deposition.

Hope it helps dear friend ☺️✌️✌️

Answer 2

@ When Iodine is heated :-

1) Violet crystalline solid on strong heating sublimates to form violet vapour. These papers settles down on cooler part of the test tube to form violet crystals
2) No Residue is left at the bottom of the test tube.
3) A filter paper dipped in starch solution turns blue when it is brought in contact with the vapour.
4) These vapours or fumes turn paper dipped in silver nitrate solution yellow.

@ When ammonium chloride is heated

1) White crystalline solid, on strong heating, sublimates to form a basic gas (NH3) and an acidic gas(HCl).
2) The dense white fumes are noticed which form a white mass on the cooler parts of the test tube.
3) No residue is left behind.