Freezing

Q.

The temperature at which a liquid converts into a solid is called:

1. freezing point

2. melting point

3. dew point

4. boiling point

Q.

The change of state from liquid to solid is called________

Q.

Mention the significance of melting point.

Q.

The phase transition in which a liquid turns into a solid, when its temperature is lowered below its freezing point, is called as _________.

1. Solidification

2. Melting

3. Evaporation

4. Sublimation

Q.

What happens to the temperature during a change of state, for example from liquid to gas?

Q.

Define the following terms:

(a) Melting:

Q.

The freezing point of water is 273 K,

1. True
2. False

Q.

If the melting point of a substance is ${10}^{\circ }C$, then its freezing point will be :

1. less than ${10}^{\circ }C$

2. equal to ${10}^{\circ }C$

3. more than ${10}^{\circ }C$

4. none of these

Q.

The changing of gas into a liquid on cooling is called.

1. Vaporisation

2. Freezing

3. Melting

4. Condensation

Q.

The change in state from solid to liquid is known as freezing.

1. True
2. False

Q.

The process of conversion of a gas into a liquid is called____________( vaporization/ condensation).

Q.

Which process refers to the change of state from liquid to solid?

1. Boiling

2. Freezing

3. Melting

4. Condensation

Q.

Name the process by which a solid changes into its liquid form.

Q.

Differentiate between melting and freezing.

Q. The temperature at which a liquid is converted into a solid is called its freezing point.

1. True
2. False

Q.

7. Give one word:

1. Which property of ice can be changed on heating?

Q.

Name the process for the following change:

liquid⇢ solid

Q. The diagram shows the melting and boiling points of four different substances. Which substance has a freezing point at ${40}^{\circ }C$?Identify a temperature range at which substances B and D can co-exist in liquid state?

Q.

What do you mean by melting a solid? Why does the temperature remain constant during the melting of ice even though the heat is supplied continuously?

Q. During freezing, heat is _______.

1. generated
2. absorbed
3. destroyed
4. released

Q.

The temperature at which solid changes into a liquid is called.

1. solidification point

2. melting point

3. freezing point

4. condensation point

Q. The melting point of ice and freezing point of water have .............. numerical values

1. Same
2. different
3. Cant say
4. None of the above

Q.

When a solid change to a liquid it is called?

Q.

The change in state from solid to liquid is known as:

1. melting

2. boiling

3. freezing

4. sublimation

Q.

How can you determine the melting point?

Q.

How is frost formed?

Q.

Why is solid CaCl₂ spread on roads in cold countries during winter?

Q.

Conversion of vapors into solid without passing through the liquid state is called freezing.

1. True
2. False

Q. During solidification, heat energy is liberated.

1. True
2. False

Q. The temperature at which a solid starts changing to liquid state is called :

1. latent heat of fusion
2. none of the above
3. melting point
4. latent heat of vaporisation