GCSE Physics - Specific Latent Heat #29

The video tutorial explains specific latent heat and its role in state changes of substances. It covers how energy is used during melting and boiling, and introduces the concepts of specific latent heat of vaporization and fusion. The tutorial uses graphs to illustrate temperature changes during state transitions and provides a practical example with water. It concludes with the equation for calculating specific latent heat, emphasizing that energy is required or released during state changes without temperature change.

What happens to the temperature of a substance during a change of state?

• It increases steadily.

• It fluctuates randomly.

• It decreases steadily.

• It remains constant.

What is specific latent heat?

• The energy required to change the temperature of a substance.

• The energy released when a substance cools down.

• The energy required to increase the pressure of a substance.

• The energy required to change the state of 1 kg of a substance without changing its temperature.

Which type of specific latent heat is involved when a liquid turns into a gas?

• Specific latent heat of fusion

• Specific latent heat of sublimation

• Specific latent heat of condensation

• Specific latent heat of vaporization

How much energy is required to melt 1 kg of ice at 0°C?

• 334,000 joules

• 2,260,000 joules

• 500,000 joules

• 1,000,000 joules

What is the specific latent heat of vaporization for water?

• 1,000,000 joules per kilo

• 500,000 joules per kilo

• 2,260,000 joules per kilo

• 334,000 joules per kilo

What is the formula for calculating the energy required or released during a state change?

• Energy = Mass + Specific Latent Heat

• Energy = Mass / Specific Latent Heat

• Energy = Mass * Specific Latent Heat

• Energy = Mass - Specific Latent Heat

How much energy is needed to completely boil 2.5 kg of water at 100°C?

• 1,000,000 joules

• 334,000 joules

• 2,260,000 joules

• 5,650,000 joules