Condensation

Q. What is the definition of solidification?

Q.

What do you mean by volatile liquid?

Q. Why is cooling produced when a liquid evaporates?​

Q.

The picture below shows the change in two states of matter. Identify the process 'X', by which gas is converted to liquid.

1. Sublimation

2. Freezing

3. Melting

4. Condensation

Q.

The reverse process of sublimation is ____________________.

Q.

What is condensed water falling from the atmosphere called?

1. Dew Point

2. Precipitation

3. Upwind

4. Meteors

Q.

The picture given below shows the changes in two states of matter. Identify the process 'X', by which gas is converted to liquid.

1. Sublimation

2. Melting

3. Condensation

4. Freezing

Q. Give reason for the increase in rate of evaporation of a liquid when temperature of liquid is increased.​ ​

Q.

The three states of matter cannot be interchangeable.

1. True
2. False

Q.

Changing of gas directly into a solid by cooling is called ________.

Q.

What is pressure compensated temperature?

Q. Give reason for the increase in rate of evaporation of a liquid when surface area of liquid is increased.​ ​

Q. Give reason for the increase in rate of evaporation of a liquid when air is blown above the liquid.​ ​

Q. Which among the following solids does not melt on heating?

1. Camphor
2. Butter
3. Ice
4. Chocolate

Q.

Define deposition.

Q.

By giving at least one reason for whether the changes listed below are physical or chemical.

Bursting of crackers.

Q.

Why gases liquify on lowering the temperature?

Q.

Give an example of a substance that exists in different states in nature. Name the different states.

Q.

3. A flower turning into fruit cannot be _______ change because it is irreversible.

Q. Water droplets are formed on the outer surface of a glass containing ice-cold water. Why?

1. Condensation
2. Evaporation
3. Vaporization
4. Both B and C

Q.

Name the process which is opposite to vaporisation.

Q.

If bubbles of air form during the change of state from liquid to gas, the liquid is said to be ________.

Q. Statement: A physical change is irreversible whereas a chemical change is reversible.

1. True
2. False

Q.

When a substance changes from gaseous state to solid state directly, it is known as _________________.

Q. In early winter mornings, we can see drops of water on the blades of grass. This is because of :

1. photosynthesis
2. transpiration
3. condensation
4. water cycle

Q.

2. State whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.

Q.

Very small fragments of solid particles suspended in the air.

Q.

When a gas gets converted into a solid without undergoing its liquid state, it is called__________( deposition/ sublimation).

Q.

Matter can be converted from one state to another and then brought back to the original state by making suitable changes in temperature and pressure.

1. True
2. False

Q.

Give one word/a few words for each of the following:

Solid obtained on cooling the vapour.