Understanding Specific Latent Heat and Change of State in Substances

The video tutorial explains how energy is absorbed or emitted by a substance during state changes, using a graph to illustrate temperature variations with thermal energy absorption. It covers the concepts of melting and boiling, emphasizing that temperature remains constant during state changes while potential energy increases. The tutorial introduces equations for calculating energy required for state changes, providing examples with water, gold, and hydrogen. It concludes by discussing the types of latent heat: fusion and vaporization.

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

• It increases.

• It decreases.

• It remains constant.

• It fluctuates randomly.

Which equation component represents the specific latent heat in the energy calculation?

• E

• M

• L

• Q

How much energy is required to convert 0.01 kg of water into vapor if the specific latent heat is 2,250,000 J/kg?

• 225,000 J

• 225 J

• 2,250 J

• 22,500 J

If 83,750 J of energy is absorbed by gold with a specific latent heat of 67,000 J/kg, what is the mass of gold that melts?

• 1.25 kg

• 1.50 kg

• 2.00 kg

• 1.75 kg

What is the specific latent heat of hydrogen if 1844 J is required to melt 4 kg of it?

• 461 J/kg

• 184 J/kg

• 368 J/kg

• 92 J/kg

What is the latent heat of fusion?

• Energy required to change a gas to a liquid

• Energy required to change a liquid to a gas

• Energy required to change a liquid to a solid

• Energy required to change a solid to a liquid

Which type of latent heat is involved in the transition from liquid to gas?

• Latent heat of condensation

• Latent heat of fusion

• Latent heat of sublimation

• Latent heat of vaporization