Advertisements
Advertisements
Question
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Advertisements
Solution
Sublimation of ammonium chloride – [NH4C1]
Ammonium chloride sublimes on heating and dissociates into ammonia [NH3] and hydrogen chloride [HC1], which recombine on cooling to give back – NH4C1
\[\ce{NH4Cl [s] ⇌ NH3 [g] + HCl [g]}\]
Dissociation is a chemical change.
Hence, the sublimation of such substances involves both – a physical and a chemical change.
APPEARS IN
RELATED QUESTIONS
Explain the following giving an example.
Pure substance
State four differences between physical and chemical changes.
Classify the following as a physical or a chemical change.
Boiling of water
Classify the following as a physical or a chemical change.
Burning of coal
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Name the following.
A form of energy required for a chemical change.
Which of the following is a physical change?
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
Give an example of a physical change in which the color of the substance changes.
