Q7 of 17 Page 71

Answer the following:

Explain the role of latent heat in the change of state of a substance?

The role of latent heat in the change of state of a substance are:


⇒ Latent heat of fusion: The latent heat of fusion helps to transform any substance from solid state to liquid state by absorbing heat energy at constant temperature during transformation.


⇒ Latent heat of vaporization: The latent heat of vaporization helps to transform any liquid substance from liquid state to gaseous state by absorbing heat energy at constant temperature during transformation.


More from this chapter

All 17 →
7

Answer the following:

What is meant by latent heat? How will the state of matter transform if latent heat is given off?

 7

Answer the following:

Which principle is used to measure the specific heat capacity of a substance?

 7

Answer the following:

On what basis and how will you determine whether air is saturated with vapor or not?

 8

Read the following paragraph and answer the questions.

If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy.


The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.


i. Heat is transferred from where to where?


ii. Which principle do we learn about from this process?


iii. How will you state the principle briefly?


iv. Which property of the substance is measured using this principle?