13. How does evaporation cause cooling?
14. Comment on the following statements:
a. Evaporation causes cooling,
b. Rate of evaporation of an aqueous solution
decreases with increase in humidity.
c. Sponge though compressible is a solid
d. Ice is solid at 0°C, while water is liquid at
room temperature.
e. Sugar crystals dissolve faster in hot water
than cold water
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Answers
Answer:
13. Evaporation causes cooling because the warm air goes up and cold air comes down.
a.true
b.false
c.false
d.true
e.true
Evaporation causes cooling because the process requires thermal energy.
Explanation:
a. Evaporation causes cooling because the process requires thermal energy. The energy is absorbed by the molecules when they convert from liquid to gas, and this causes cooling on the original surface.
b. The humidity present in the atmosphere is called humidity. A dry atmosphere can hold more water molecules than a wet atmosphere. As a result, the evaporation rate of aqueous solution decreases with increased humidity and vice versa.
c. It's a porous solid sponge. The sponge has minute holes in which the air is trapped when we press it, the air is blown out and we can compress it. The sponge can be compressed easily, but we still count it in solids because it has minute pores filled with air.
d. The state of the molecule is determined by the intermolecular forces of the molecule. Water is a fluid at room temperature due to the presence of hydrogen bonds. But the water remains as ice at 0 degrees Celsius as the melting point of the water at 0 degrees Celsius
e. Sugar dissolves faster in hot water than in cold water, because hot water has more energy than cold water. When the water is heated, the molecules gain energy and move faster. As they move faster, they come into contact with sugar more often, causing it to dissolve more quickly.
To know more:
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