Q12.7 P - Chemistry: Molecular Nature Of Matter And Change

Question

Name the phase change in each of these events

(a) Dew appears on a lawn in the morning

(b) Icicles change into liquid water

(c) Wet clothes dry on a summer day.

 

Step-by-Step Solution

Answer

The phase change in each of these mentioned events is as follows:

1. From liquid to solid
2. From liquid to solid
3. From liquid to solid

Step-1: Dew

Dew is the form of water droplets that appears on exposed objects in the morning and evening.

Step-2: Phase change

In the morning/ evening, due to a decrease in temperature, condensation takes place, thus water vapors that exist in the atmosphere condense to liquid water. This process converts the gaseous phase to the liquid phase.

Step 3: Icicles

Icicles are solid hanging water formed by the freezing of dripping water.

Step 4: Phase conversion

During this process, icicles which are the solid phase of water converts into liquid water.

Step 5: Wet clothes in summer

Wet clothes consist of water. When they are allowed to dry in summer, the increase in temperature on a summer day converts liquid water to water vapor. This allows drying of the wet clothes.

Step 6: Phase transformation

This is a simple process that uses solar energy to convert liquid water to gaseous water vapor.