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

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

What is the formula to calculate specific latent heat of vaporisation?

• L = Q/m

• c = Q/(mΔƟ)

• Q = mcΔƟ

• Q = mL

Tags

NGSS.MS-PS1-4

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

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

How much energy is required to change 2600 g of water at 100 $\degree$ C into steam temperature? (latent heat of vaporization is 2.26 x $10^6$ ) 

• Q = 5.9 X $10^6$  J

• M = 5.9 X $10^6$  J

• C = 5.9 X $10^6$  J

•  $\Delta$ T = 5.9 X $10^6$  J

The graph shows the cooling curve of a substance.
The specific latent heat released at stages?

• CD and FG
• DE and EF
• EF and FG
• DE and FG

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4