Latent Heat and Temperature Concepts

The video explains the concept of specific latent heat, which is the energy required to change the state of a substance without changing its temperature. An experiment is conducted using ice cubes and a thermometer to demonstrate how temperature remains constant during state changes, such as melting and boiling. The energy supplied is used to break intermolecular forces, not to increase temperature, hence the term 'latent heat'.

What is specific latent heat?

• The amount of heat energy required to decrease the temperature of a substance

• The amount of heat energy required to change the state of a substance with change in temperature

• The amount of heat energy required to increase the temperature of a substance

• The amount of heat energy required to change the state of a unit mass of a substance without change in temperature

What does the term 'latent' mean?

• Active

• Hot

• Visible

• Dormant or concealed

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

• 100 degrees centigrade

• 50 degrees centigrade

• 25 degrees centigrade

• 0 degrees centigrade

During the melting of ice, what happens to the temperature?

• It remains constant

• It decreases

• It fluctuates

• It increases

At what temperature does water start boiling in the experiment?

• 0 degrees centigrade

• 150 degrees centigrade

• 50 degrees centigrade

• 100 degrees centigrade

What happens to the temperature of water when it starts boiling?

• It fluctuates

• It remains constant

• It decreases

• It increases

What is the boiling point of water?

• 100 degrees centigrade

• 150 degrees centigrade

• 50 degrees centigrade

• 0 degrees centigrade

What is the energy supplied during the change of state used for?

• To increase the temperature

• To change the color of the substance

• To break the intermolecular force of attraction

• To decrease the temperature

Why does the thermometer not register a rise in temperature during the change of state?

• Because the energy is used to break intermolecular forces

• Because the thermometer is faulty

• Because the substance is too hot

• Because the substance is too cold

Why is the heat supplied during the change of state called latent heat?

• Because it is visible

• Because it increases the temperature

• Because it is recorded by the thermometer

• Because it is not recorded by the thermometer