Latent Heat Problems

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

the symbol for specific latent heat is

• c

• L

• Q

• m

What is the equation to measure change in Thermal Energy?

• Q=mc∆t
• Q=mc
• Q= ∆mct
• m=QC

Tags

NGSS.HS-PS3-4

How much heat must be lost to change of 110 grams of water at 0 ºC to 110 grams of ice at 0ºC? Heat of fusion = 334 kJ/kg; Specific heat of water = 4186 J/kg^oC

• Q = 110 x 4186

• Q = 110000 x 4186

• Q = 0.110 x 334

• Q = 110 x 334

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If the specific heat of water is 4,186 J/kg°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• Q = 1.2 x 4186

• Q = 1.2 x 4186 x 7

• Q = 1.2 x 4186 x 17

• Q = 0.0012 x 4186 x 17

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q = m Cp ∆T
• Q = m Cp
• Q =  ½ m v
• m = Q Cp

Tags

NGSS.MS-PS3-4

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J

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

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-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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4