What is the primary role of specific latent heat in phase changes?

Energy and Phase Changes in Water

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Physics, Science, Chemistry
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9th - 10th Grade
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Hard

Patricia Brown
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To break molecular bonds during phase changes
To increase the temperature of a substance
To change the color of a substance
To decrease the temperature of a substance
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During the boiling of water, why does the temperature remain constant at 100°C?
The water absorbs energy from the surroundings
The water loses energy to the surroundings
The energy is used to increase the kinetic energy of molecules
The energy is used to break molecular bonds
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the specific latent heat of fusion for water?
4,200 J/kg
1.00 x 10^5 J/kg
3.34 x 10^5 J/kg
2.27 x 10^6 J/kg
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following requires more energy: melting ice or boiling water?
Neither requires energy
Boiling water
Melting ice
Both require the same energy
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the energy required for a phase change calculated?
Q = M x V
Q = M x L
Q = C x L
Q = M x C x ΔT
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the example of melting lead, what is the specific latent heat of fusion used?
23 kJ/kg
2.27 x 10^6 J/kg
3.34 x 10^5 J/kg
4,200 J/kg
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in calculating the energy required to turn water at 80°C into steam?
Calculate the energy to raise the temperature to 100°C
Calculate the energy to cool the water
Calculate the energy to freeze the water
Calculate the energy to condense the steam
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