Explain why the heating of ammonium chloride can be understood as a combination of physical and chemical change.Give another example of the same type of changeConcise Chemistry For Class Ix By Dr S.P Singh Chapter 5-Physical And Chemical Changes
Answers
Answered by
15
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.
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.
Similar questions