Latent Heat

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

Tags

NGSS.MS-PS1-4

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

• melting

• evaporating

• freezing

• condensing

• sublimation

Tags

NGSS.MS-PS1-4

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

• melting

• evaporating

• freezing

• condensing

• sublimation

Tags

NGSS.MS-PS1-4

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

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The amount of heat required to change the phase of a substance depends on two factors which are

• surrounding temperature

• temperature change

• material

• the mass

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

specific latent heat of vaporisation is

• the amount of heat required to change 1 kg of the substance from the solid to liquid phase without change in temperature

• the amount of heat required to change 1 kg of the substance from the liquid to gaseous phase without change in temperature

• the amount of heat required to change the temperature 1 kg of the substance by 1 degree Celcius

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

if 334000 J of heat is required to change state of 1 kg of ice into water then heat of fusion is

• 668000 J/kg

• 334000 kg

• 334000 J/kg

• 668000 J

Tags

NGSS.HS-PS3-1

How much energy is required to freeze 150 g of water? ( L_V=2260 and L_F=334)

• 50 100 cal

• 339 000 J

• 339 000 cal

• 50 100 J