Freezing

Q.

On heating a sublimate solid , the molecules break free and escape from surface of the solid directly into vapour

Q.

Differentiate between the following.

. Boiling point of water and freezing point of water.

Q. What is meant by boiling point and freezing point? Write the boiling point and freezing point of water.

Q.

The process through which a substance changes from a liquid to a solid is called freezing

1. False

2. True

Q. What is meant by boiling point and freezing point? Write the boiling point and freezing point of water.

Q. The process of a liquid turning into a solid by lowering the temperature is called .

1. melting
2. freezing
3. condensation

Q.

Define freezing.

Q.

The phase transition in which a liquid turns into a solid is called _________.

1. Solidification

2. Melting

3. Evaporation

4. Sublimation

Q.

The phase transition in which a liquid turns into a solid is called as _______

1. Melting

2. Sublimation

3. Evaporation

4. Solidification

Q.

What is the melting point of water in Celsius?

1. $-1^{\circ }C$

2. $0^{\circ }C$

3. $1^{\circ }C$

4. $2^{\circ }C$

Q.

How does a liquid change into a solid on cooling?

Q. ‘Iodine is a substance that is easily converted into gas on heating.’

What is this phenomenon called?

Q. The melting point of the solid state of a substance is ${40}^{\circ }C$. The freezing point of the liquid state of the same substance will be:

1. more than ${40}^{\circ }C$
2. less than ${40}^{\circ }C$
3. always ${100}^{\circ }C$
4. equal to ${40}^{\circ }C$

Q.

The melting point of a non-sublimable solid is ${100}^{\mathrm{o}}\mathrm{C}$. What do you observe when a small piece of this solid is taken in a test tube and placed in boiling water?

Q.

The process in which solids are converted into liquids is called_________( melting/ freezing).

Q. The cooling curve below suggests that the melting point of naphthalene is?

1. $353$ K
2. $80$ K
3. $40$ K
4. $373$ K

Q.

$\mathrm{Solid}\stackrel{\mathrm{melting}}{\to }\mathrm{\_\_\_\_\_\_\_\_\_}$