Latent Heat Conceptual Problems

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

• Melting

• Boiling

• Condensation

• All the above

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NGSS.MS-PS1-4

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

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NGSS.MS-PS1-4

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

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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

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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

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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

Water molecules have the greatest kinetic energy in

• Ice at 0 ⁰C

• Water at 90 ⁰C

• Water at 373 K

• Steam at 150 ⁰C

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• AB and CD

• BC and DE

• AB and EF

• BC and CD

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Calculate the energy absorbed by 30 g of 100 ⁰C water that is turned into 100 ⁰C.

• 67 800 J

• 6 7800 J

• 678 J

• 67.8 J

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NGSS.MS-PS1-4

NGSS.MS-PS3-4