Latent Heat

Specific Latent Heat

Multiple Choice

The diagram shows a cooling curve for water. Which line represents the water in a solid form?

• A

• B

• C

• D

• E

Multiple Choice

The diagram shows a cooling curve for water. Which line represents the water freezing?

• A

• B

• C

• D

• E

Multiple Choice

The diagram shows a cooling curve for water. Which line represents the it in a liquid state (water)?

• A

• B

• C

• D

• E

Multiple Choice

The diagram shows a heating curve for water. Which line represents the it in a liquid state (water)?

• A

• B

• C

• D

• E

Multiple Choice

The diagram shows a heating curve for water. Which line represents ice melting?

• A

• B

• C

• D

• E

Multiple Choice

Why are lines B and D flat?

• The ice is melting

• The ice is freezing

• All of the thermal energy is used to break the bonds

• They stopped the stopwatch

• They stopped heating the ice.

Multiple Choice

Latent Heat is

• the heat absorbed or released at a boiling process during a change of state

• the heat absorbed or released at a constant temperature during a change of state

• the heat absorbed or released at a constant temperature during a change of state of 1 kg object

• the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

Fill in the Blank

Specific latent heat is the amount of energy required to change the state of 1 kg of a substance without changing its ___________.

Multiple Choice

The heat absorbed by melting a solid is known as

• latent heat of fusion

• latent heat of solid

• latent heat of liquid

• latent heat of vaporisation

Multiple Select

Select the state changes that latent heat of fusion applies to.

• melting

• evaporating

• freezing

• condensing

• sublimation

Multiple Select

Select the state changes that latent heat of vaporisation applies to.

• melting

• evaporating

• freezing

• condensing

• sublimation

Multiple Choice

Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?

• Part I

• Part II

• Part III

• Part IV

Multiple Select

Select the correct equations.

• thermal energy = specific latent heat / mass

• thermal energy = specific latent heat x mass

• mass = specific latent heat / thermal energy

• specific latent heat = thermal energy / mass

• mass = specific latent heat x thermal energy

Multiple Choice

How much energy is required to melt down a 2000 g of mercury?(latent heat of fusion is 1.14 x  $$10^4$$ J/kg)

• 2.55  x  $10^4$ J

• 2.28 x  $10^4$ J

• 2,280 x  $10^4$ J

• 3.28  x  $10^4$ J

Multiple Choice

How much energy is required to change 5 kg of ice at 0 $$\degree$$ C into water at the same temperature? (latent heat of fusion is 3.36 X $$10^6$$ J/kg )

• 16.1 X $10^6$ J

• 16.8 X $10^6$ J

• 15.1 X $10^6$ cal

• 16.8 X $10^6$ cal