Why do immiscible liquids form two separate layers in a separating funnel? Class 9

Why do immiscible liquids form two separate layers in a separating funnel? Class 9

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Question 1.

Why do immiscible liquids form two separate layers in a separating funnel? Class 9

Answer:

Immiscible liquids do not mix with each other because they have different chemical properties (polarity). They also have different densities. The denser liquid sinks to the bottom and the less dense liquid floats on top, forming two distinct, separate layers. For example, water (denser) forms the lower layer and mustard oil (less dense) forms the upper layer.

Question 2.

Is sublimation different from evaporation? Justify. Class 9

Answer:

Yes, sublimation is different from evaporation. Evaporation is the process by which a liquid converts into vapour at the surface, below its boiling point. Sublimation is the process by which a solid converts directly into vapour without passing through the liquid state. So in evaporation, the substance first exists as a liquid (e.g., water evaporating from a wet cloth). In sublimation, the substance goes from solid directly to gas (e.g., camphor, naphthalene balls disappearing without leaving any liquid behind).