Phase Change and Heat of Fusion

Mr. Mott explains how to calculate the heat of fusion of ice using a phase change diagram. The video covers the lab setup, data collection, and calculations for heat absorbed and released. It concludes with calculating the heat of fusion and discussing the percent difference from the accepted value.

What is the primary focus of the phase change diagram discussed in the video?

• The specific heat capacity of water

• The heat of fusion and phase changes

• The heat of vaporization

• The boiling point of water

At what temperature does ice start to melt according to the phase change diagram?

• 32 degrees Fahrenheit

• 0 degrees Celsius

• 273 Kelvin

• 100 degrees Celsius

What was the initial temperature of the hot water used in the lab experiment?

• 3 degrees Celsius

• 62 degrees Celsius

• 100 degrees Celsius

• 0 degrees Celsius

What was the final temperature of the water after adding ice in the experiment?

• 100 degrees Celsius

• 0 degrees Celsius

• 3 degrees Celsius

• 62 degrees Celsius

How much heat was released by the hot water during the experiment?

• 24,662 joules

• 4,662 joules

• 46,620 joules

• 2,466 joules

What is the calculated heat of fusion of ice from the experiment?

• 400 joules per gram

• 300 joules per gram

• 354 joules per gram

• 334 joules per gram

Why can't the formula Q = MCΔT be used during phase changes?

• Because the heat of vaporization is needed

• Because the specific heat is unknown

• Because there is no change in temperature

• Because the mass changes

What is the accepted value for the heat of fusion of ice?

• 400 joules per gram

• 354 joules per gram

• 334 joules per gram

• 300 joules per gram

What is the percent difference between the experimental and accepted values of the heat of fusion?

• 10%

• 6%

• 15%

• 3%

What is the significance of the heat of fusion in phase changes?

• It is used to find the freezing point

• It calculates the specific heat capacity

• It measures the energy needed to melt a solid

• It determines the boiling point