Specific Latent Heat

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 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

Tags

NGSS.MS-PS1-4

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

the symbol for specific latent heat is

• c

• L

• Q

• m

Water molecules have the greatest kinetic energy in

• Ice at 0 ⁰C

• Water at 90 ⁰C

• Water at 373 K

• Steam at 150 ⁰C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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.MS-PS1-4

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)

Which of the following best explains why the sand at the beach is hotter than the water?

• Sand has a higher specific heat than water.

• Sand has a lower specific heat than water.

• There is more water than sand at the beach.

• There is more sand than water at the beach.

Tags

NGSS.MS-PS3-4

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