Melting Point

Q. What is latent heat? What are its types?

Q. Predict the physical state of a substance which has melting point below room temperature.

Q.

Name the temperature at which:

(a) a liquid changes into a gas (b) a solid changes into a liquid

Q.

Define melting and vaporisation?

Q. force of attraction keeps the particles of matter together.

1. Intermolecular
2. Gravitational
3. Frictional

Q.

Define 'melting point' of a substance? What is the melting point of ice?

Q.

When two ice cubes are pressed tightly we find that two ice cubes join together. Why? (5 marks) .

Q.

Name one common substance which can be easily changed from one state to another by heating or cooling.

Q. why do we see water droplets collected on the outer surface of a glass container, containing ice?

Q.

Does gases have melting and boiling point?

Q.

effect of change of temperature

Q.

Melting point of three substances a, b, c are 52 degree Celsius and 75 degree Celsius and 80 degree Celsius. Arrange them in the decreasing order of the interparticle force of attraction in each of them. Also ive a reason for the answer.

Q.

Define the following terms:

(a) Melting (b) Boiling

Q.

The change of state from solid to liquid known as :

1. boiling

2. melting

3. sublimation

4. fusion

Q.

The process of converting a solid into its liquid state is called fusion.

1. True
2. False

Q.

The kinetic energy of molecules _____ when a solid melts. (increases/decreases)

Q.

Explain the process of boiling on the basis of kinetic theory.

Q.

With increase in intermolecular force of attraction, melting point of solid _____ .

1. decreases gradually
2. increases
3. first decreases and then increases
4. decreases abruptly

Q. Which of the following processes is involved in the conversion of ice into water?

1. Condensation
2. Sublimation
3. Fusion
4. Solidification

Q.

What happens to the force of attraction when the melting point of a substance is high?

Q. What exactly happens when solid changes into a liquid and a liquid into a gas?

Q.

Explain fusion or melting.

Q.

The temperature at which a solid changes into liquid at atmospheric pressure is called :

1. Melting point.

2. Boiling point.

3. Diffusion.

4. Evaporation.

Q. What happens to the melting point of ice when pressure is increased?

Q.

Melting point of a solid is an indication of the strength of the force of attraction between its particles.

1. True

2. False

Q.

Why particles of ice have more energy than particles of water at 273 Kelvin?

Q. Melting point and freezing point of a substance is the same temperature at a constant pressure.

1. False
2. True

Q.

Explain the melting of solids on the bases of kinetic theory.

Q.

The temperature at which a given material changes from a solid to a liquid is defined as__________.

1. melting point

2. evaporation point

3. boiling point

4. freezing point

Q.

Freezing point of solid ammonia is ___ degree celsius.