Heat of Fusion

Which of the following factors relates to the amount of heat that changes the state of a substance?

• Mass

• Specific heat of a substance

• Specific latent heat of a substance

• The change in temperature of a substance

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How much heat is needed to change 12 grams of ice at 0 ºC to 12 grams of water at 0ºC? Heat of fusion = 334 kJ/kg; Specific heat of water = 4186 J/kg

• Q = 12 x 4186 x 0

• Q = 12 x 334

• Q = 12000 x 334

• Q = 0.012 x 334

Tags

NGSS.MS-PS1-4

NGSS.MS-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

• 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

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down

• They would stop moving

• They would speed up

• There would be no effect

Tags

NGSS.MS-PS1-4

How many Joules of energy are required to make 50.0 grams of ice at 0 ^οC completely melt?

• 334 J

• 0 J

• 33,400 J

• 16,700 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the formula to calculate heat energy required to freeze any substance?

• q=mc∆t

• q=mH_f

• q= mH_v

How many Joules of energy are required to make 100 grams of ice at 0 ^οC completely melt?

• 200 J

• 400 J

• 33,400 J

• 2,000,000 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following best describes the heat of fusion?

• The heat required to raise the temperature of a substance by 1 degree Celsius

• The heat required to change a substance from solid to liquid at its melting point

• The heat required to change a substance from liquid to gas at its boiling point

• The heat required to change a substance from gas to liquid at its condensation point

Tags

NGSS.MS-PS1-4

What is the heat of fusion of water?

• 334 J/kg

• 334 kJ/kg

• 4186 J/kg

• 4186 kJ/kg

If 200 grams of ice at 0 ºC is melted, how much energy is absorbed? (Heat of fusion = 334 kJ/kg)

• 66,800 J

• 668 J

• 668,000 J

• 33,400 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4