Calculations with Latent Heat

It's the amount of heat required to change the state (gas,liquid, solid) of a unit of material

• Latent Heat

• Specific Heat

• Temperature

• Q

Tags

NGSS.HS-PS3-4

This symbol represents specific heat

• Q

• c

• ΔT

• L

Tags

NGSS.HS-PS3-4

This symbol represents latent heat

• Q

• c

• ΔT

• L

Tags

NGSS.HS-PS3-4

This formula is used to find the amount of heat (energy) neccesary when there's a phase change

• Q= (h)(ΔT)

• Q=(m)(L)

• Q=(m)(c)(ΔT)

• Q=(k)(A)(dT)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

There are four main processes in changing of phase, and they are

• Melting

• Boiling

• Condensation

• All the above

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

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 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