

Energy Calculations in Phase Changes
Interactive Video
•
Mathematics, Chemistry, Science
•
9th - 12th Grade
•
Practice Problem
•
Hard
Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of using a heating curve in energy calculations?
To guide the selection of equations and constants
To identify the phase of a substance
To measure the speed of a chemical reaction
To determine the color of a substance
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which formula is used to calculate the energy required to melt ice at its freezing point?
Q = m * c * ΔT
Q = n * ΔH_fusion
Q = n * ΔH_vaporization
Q = m * ΔH_sublimation
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molar mass of water used in the energy calculation for melting ice?
20.00 g/mol
18.02 g/mol
22.04 g/mol
16.00 g/mol
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the energy required for crystallization compare to that for melting?
It is unrelated to the energy required for melting
It is the same as the energy required for melting
It is half the energy required for melting
It is double the energy required for melting
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula used to calculate the energy required for vaporization at the boiling point?
Q = n * ΔH_fusion
Q = m * c * ΔT
Q = n * ΔH_vaporization
Q = m * ΔH_sublimation
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If 15.0 kilojoules of heat are added, how many grams of water can vaporize at the boiling point?
3.16 grams
5.16 grams
4.16 grams
6.16 grams
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which formula is used to calculate energy when there is a temperature change?
Q = m * ΔH_sublimation
Q = m * c * ΔT
Q = n * ΔH_fusion
Q = n * ΔH_vaporization
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