Latent Heat

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

• A

• B

• C

• D

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 heating the ice.

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

• A

• B

• C

• D

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

• B

• C

• D

• E

Latent heat is

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

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

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

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

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

the symbol for specific latent heat is

• c

• L

• Q

• m

Durning a phase change the temperature of a substance_________.

• always increases
• always decreases
• always stays the same
• varies

The equation for calculating the latent involved in a substance being heated is Q = mL. The correct formula for the latent heat is

The equation for calculating the latent involved in a substance being heated is Q = mL. The correct formula for the mass of material changing phase is