when ammonium chloride is heated it undergoes what
Answers
Answer:
when ammonium chloride is heated
it undergoes sublimation
Answer:
Ammonium chloride is a compound of ammonia containing the chloride radical Cl2. Ammonium chloride, when heated, undergoes thermal dissociation, to form ammonia and hydrogen chloride. Ammonia and hydrogen chloride recombine at the cooler upper parts of the test tube, and settle down as a white layer. Since the same ammonium chloride is re-obtained, this change is sometimes referred to as "sublimation". In actual sublimation, there is only a change of state and no decomposition. In the case of ammonium chloride, decomposition does take place, though the products, when cooled, recombine to from ammonium chloride.
NH4Cl(s) = NH3 (g) +HCl(g)
Other example:1.Snow and ice sublimate, although more slowly, below the melting point temperature. This phenomenon is used in freeze drying, by hanging wet cloth outdoors in freezing weather to be retrieved dry at a later time.
2.Carbon dioxide sublimates readily at atmospheric pressure—a block of solid CO2 (dry ice) at room temperature and atmospheric pressure. Iodine produces fumes on gentle heating. In contrast to CO2, though, it is possible to obtain liquid iodine at atmospheric pressure by controlling the temperature at just above the melting point of iodine.