F4 Chapter 4.3 Specific latent heat

Diagram shows a heating graph of temperature against time for a substance X. Which statement below is correct?

• Heat supplied during N to O is used to overcome force of attraction between molecules.

• Heat supplied during L to M is used to increase the temperature of the substance.

• Heat supplied during M to N is called specific latent heat of fusion.

• During O to P, average kinetic energy of molecules are constant.

Which section of the process involves the specific latent heat of vaporisation?

• A

• B

• C

• D

Specific latent heat of fusion is the amount of heat required to change

• the temperature of 1kg liquid by 1°C

• the temperature of a 1kg solid by 1°C

• a 1kg substance from liquid sate to the gaseous state

• a 1kg substance from the solid state to the liquid state.

The heat released during the process condensation is known as

• Specific heat capacity of fusion

• . Specific heat capacity of vaporisation

• Specific latent heat of fusion

• Specific latent heat of vaporisation

During the process of melting, the temperature of the substance remain unchanged. This is because of

• Heat absorbed to build the bond of the particles

• Heat released to build the bond of the particles

• Heat absorbed to break the bond of the particles

• Heat released to break the bond of the particles

The figure below show the arrangement of apparatus to determine the specific latent heat of fusion of ice. The control experiment is used to

• determine the mass of ice melted by the heat from the surroundings.

• ensure that pure ice is used.

• determine the average of value of specific latent heat of fusion of ice.

• control the rate of melting of ice.

• 12W

• 120W

• 1200W

• 12000W

• 147W

• 4200W

• 13400W

• 176400W

Which of the following can help to evaporate the water faster?

• Use ceramic container

• Increase the mass of water

• Adding salt into the water

• Use a larger area of pot.

Which phenomena shows the application of latent heat of vaporisation in everyday life?

• steaming fish

• cooling a car engine

• preserving food with melting ice block

• reading temperature from a mercury thermometer