Factors Affecting Evaporation

Q.

What is the effect of increase in surface area on the rate of evaporation?

Q.

The rate of evaporation of an aqueous solution decreases with an increase in humidity. Comment on the following statement.

Q.

Discuss the various factors upon which the rate of evaporation depends.

Q.

In which case evaporation of water will be faster

1. In the middle of the sea.

2. Evaporation does not depend upon distance from sea.

3. Near the sea

4. Away from the sea

Q. Which of the following statements are “true”?​

(a) Water vapour is present in air only during the monsoon. ​
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour, is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

Q. An equal amount of water is kept in a cup and saucer. It evaporates faster from the saucer due to the difference in the _________.

1. humidity
2. surface area
3. wind speed
4. temperature

Q. Write the difference among solids, liquids and gases.

Q.

Assertion (A): Wet clothes dry faster on a windy day.

Reason (R): Rate of evaporation is proportional to humidity.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q.

Why are wet clothes spread out to dry them quickly?

Q. Which of the following water molecules, W, X, Y or Z can easily escape to form water vapour?

1. W
2. X
3. Y
4. Z

Q. For each of the following statements , say whether it describes a solid, a liquid, or a gas.

(b) Particles are quite close together.

Q. Define evaporation. Explain any two factors affecting its rate.

Q.

Which of the following does not affect evaporation?

1. Surface area

2. Nature of vessel

3. Temperature

4. Humidity

Q. Ramesh has three samples of substance: ice, camphor, and water. He wants to change ice into water, camphor into gas, and water into vapours. Which processes should he follow for these conversions?

$\begin{array}{ccc}\text{Ice to water}& \text{Camphor to gas}& \text{Water to vapour}\end{array}$

1. $\begin{array}{ccc}\text{Freezing}& \text{Deposition}& \text{Melting}\end{array}$
2. $\begin{array}{ccc}\text{Condensation}& \text{Melting}& \text{Freezing}\end{array}$
3. $\begin{array}{ccc}\text{Melting}& \text{Evaporation}& \text{Condensation}\end{array}$
4. $\begin{array}{ccc}\text{Melting}& \text{Sublimation}& \text{Boiling}\end{array}$

Q.

Explain in brief about humidity in air.

Q.

Differentiate between boiling and evaporation.

Q.

Which of the following statements is wrong?

1. Evaporation produces cooling

2. Rate of evaporation of an aqueous solution increases with increase in humidity.

3. Both A and B

4. Solid shows rigid nature

Q. Which of the following water molecules, W, X, Y or Z can easily escape to form water vapour?

1. W
2. X
3. Y
4. Z

Q. Conversion of a substance from its gaseous to solid state requires low temperature and pressure.

1. high
2. very low
3. low

Q.

Which of the following state has the maximum interparticle forces of attraction?

1. Same in all the states of matter

2. Water

3. Water vapour

4. Ice

Q. During the process of evaporation, matter changes its state from:

1. solid to liquid
2. liquid to gas
3. solid to gas
4. liquid to solid

Q. Why is evaporation faster in the case of a china dish than a test tube?

Q.

Predict whether the process of evaporation increases/decreases with the following factor: decrease in humidity ________

Q. If $1L$ water is kept in 5 different bowls, arrange them in the increasing order of rate of evaporation.

1. Surface area = $50m^2$
2. Surface area = $150m^2$
3. Surface area = $250m^2$
4. Surface area = $300m^2$
5. Surface area = $350m^2$
   

Q.

17. _______ in humidity increases rate of evaporation.

Q.

The evaporation of a liquid can be best carried in a

1. Beaker

2. China dish

3. Test tube

4. Flask

Q. During the process of evaporation, matter changes its state from:

1. solid to liquid
2. liquid to gas
3. solid to gas
4. liquid to solid

Q.

What happens when you pour some acetone on your palm?

1. The particles gain energy from the palms or surroundings and evapoarte causing palm to feel cool.

2. The particles lose energy from the palms and condensate causing the palm to feel hot.

3. The particles lose energy and evaporate causing the palm to feel cool.

Q.

Which of the following state has the maximum interparticle forces of attraction?

1. Same in all the states of matter

2. Water

3. Water vapour

4. Ice