Latent Heat and State Changes in Matter

The video tutorial explains the concept of latent heat, focusing on the inter-conversion of states of matter. It includes two experiments: one demonstrating the melting of ice and the latent heat of fusion, and another showing the boiling of water and the latent heat of vaporization. The tutorial highlights how heat energy is used to change the state of matter without raising its temperature.

What is the process called when matter changes from one state to another?

• Condensation

• Latent heat

• Inter-conversion of states

• Thermal expansion

In the ice melting experiment, what is the initial temperature of the ice?

• 50 degrees Celsius

• 100 degrees Celsius

• 0 degrees Celsius

• 10 degrees Celsius

What is the role of heat energy during the melting of ice?

• It decreases the temperature of the ice

• It raises the temperature of the ice

• It changes the state of ice without raising the temperature

• It cools down the surrounding air

What is the latent heat of fusion?

• The heat required to change a liquid to a gas

• The heat required to change a solid to a liquid

• The heat required to change a gas to a liquid

• The heat required to change a liquid to a solid

At what temperature does water start to boil at standard atmospheric pressure?

• 150 degrees Celsius

• 100 degrees Celsius

• 50 degrees Celsius

• 0 degrees Celsius

What is the boiling point of a liquid?

• The temperature at which a liquid freezes

• The temperature at which a liquid evaporates completely

• The temperature at which a liquid starts boiling

• The temperature at which a liquid condenses

During the boiling of water, what happens to the temperature once it reaches the boiling point?

• It decreases

• It continues to rise

• It remains constant

• It fluctuates

What is the latent heat of vaporization?

• The heat required to change a solid to a liquid

• The heat required to change a liquid to a solid

• The heat required to change a liquid to a gas

• The heat required to change a gas to a solid

What happens to the heat energy during the change from liquid to gas?

• It is released into the atmosphere

• It cools down the liquid

• It is absorbed without raising the temperature

• It raises the temperature of the liquid

Which of the following is true about latent heat?

• It raises the temperature of a substance

• It is only involved in cooling processes

• It is the heat absorbed or released during a change of state

• It is the heat required to increase the volume of a substance