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

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

Water boils at 100°C and freezes at 0°C.
What happens to the boiling point and the freezing point when salt is added to the water?

• The boiling point and the freezing point remain unchanged
• Both the boiling point and the freezing point increases
• The boiling point increases and the freezing point decreases
• Both the boiling point and the freezing point decreases

In an experiment, a liquid is heated at a constant rate.

The temperature of the liquid increases and eventually becomes constant.

Which statement about the experiment is correct?

• Boiling occurs at all temperatures but only on the liquid surface.

• Boiling occurs throughout the liquid but only at the constant temperature.

• Evaporation occurs throughout the liquid and at all temperatures.

• Evaporation occurs only at the constant temperature and only on the liquid surface.