Question

Is sublimation of Ammonium Chloride a chemical change? I have searched in the Internet. But somewhere it is written that it is a chemical change because ammonium gas and hydrogen chloride are produced and elsewhere that it is a physical change because it is change in state and is reversible. Tell me is it physical or chemical?

Answer 1

No, sublimation of Ammonium Chloride is not a chemical change.
because in sublimation of Ammonium Chloride it produces its gaseous form and we can convert the gaseous form into solid form by cooling it that means ammonium chloride does not produce is gas but it produces its vapour.

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Answer 2

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HERE'S THE ANSWER ✌
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Sublimation of ammonium chloride:
NH4Cl ⇔ NH3 + HCl
When ammonium chloride is heated, following changes take place.

1.Solid ammonium chloride vapourizes to form gaseous ammonium chloride. This is a physical change.
2.Ammonium chloride is partially dissociated. This a chemical change.
The products ammonia and chlorine recombine to form ammonium chloride. This is also a chemical change.
3.Ammonium chloride vapours solidify and form a sublimate. This is a physical change.
another example is : Burning of candle which involves both physical and chemical change.
On heating, candle wax melts and form liquid wax. It is a physical change. Since it again turns into solid wax on cooling. This is a reversible change.
When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the heat produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapours, heat and light. This is an irreversible change.


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