Calorimetry and Energy Calculations

The video tutorial covers the calculation of heat energy required for phase changes, including converting solid water to liquid and boiling water. It also includes a calorimetry experiment to measure the energy content of a peanut and the calculation of percent error in experimental results. Key concepts such as fusion, vaporization, and calorimetry are explained, with reference to specific equations and constants.

What is the heat of fusion used for in the context of this lesson?

• Raising the temperature of water

• Converting solid water to liquid water

• Converting liquid water to steam

• Cooling water to freezing point

Which equation is used to calculate the heat energy required to boil water?

• q = mh (vaporization)

• q = mh (fusion)

• q = mcΔT

• q = mgh

In the calorimetry experiment, what was the initial temperature of the water?

• 57 degrees Celsius

• 22 degrees Celsius

• 100 degrees Celsius

• 0 degrees Celsius

What is the formula used to calculate the total heat absorbed by the water in the experiment?

• q = mh (fusion)

• q = mh (vaporization)

• q = mcΔT

• q = mgh

What is the specific heat capacity of water used in the calculations?

• 2260 J/g°C

• 334 J/g°C

• 1 J/g°C

• 4.18 J/g°C

How much heat energy was calculated to be absorbed by the water in the experiment?

• 33,400 joules

• 14,630 joules

• 25,900 joules

• 67,800 joules

What is the accepted energy content of a peanut according to the experiment?

• 25.9 kJ/g

• 30.2 kJ/g

• 14.6 kJ/g

• 67.8 kJ/g

What is the formula for calculating percent error?

• (Measured value + Accepted value) / 2

• (Measured value - Accepted value) x 100

• (Accepted value - Measured value) / Measured value x 100

• (Measured value - Accepted value) / Accepted value x 100

What was the student's experimental value for the energy content of the peanut?

• 67.8 kJ/g

• 14.6 kJ/g

• 25.9 kJ/g

• 30.2 kJ/g

What was the calculated percent error in the student's experiment?

• 14.2%

• 5.8%

• 10.5%

• 20.1%