Question

1. The processes of boiling and evaporation are physical changes. Why?
2. Sublimation of ammonium chloride is a physical change. Why?​

Answer 1

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Answer:

1) The process of boiling and evaporation are physical change because this process can be reversed back and also no new substance is formed by the process. The evaporated water can be brought back its original state by using some physical process.

2) Sublimation is the process of change of state from solid directly into vapour. As there is no change in the composition of the compound just a change of state, sublimation process is a physical change. Ammonium chloride decomposes into ammonia and hydrochloric acid at its sublimation temperature.

Answer 2

Answer:

The process of boiling and evaporation are physical changes are the changes in which substance which is changed can be reserved and no new substance is formed. Since the process of boiling and evaporation can be reserved and no new substance is formed. we call it as a physical change.