Practice Problems
Phase Diagrams
Topics:
On this worksheet you will be working with a phase diagram of a substance transitioning from a solid to a vapor.
Page Directions
The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.
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no duplicate
answers shown for the same question. If duplicates are present simply refresh the page until every answer is unique.
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(even when you are just starting the worksheet on Question 1)
it is necessary to
any questions that you have not answered. Once you start submitting answers, the page may be checked as many times as necesasary without changing the randomized answers. Relevant scoring will be provided at the top of the page only when you answer all of the questions on your original submission.
The y-axis on the graph represents the substance's temperature, in ºC, while the x-axis represents the amount of time, in seconds, that heat, in joules, has been added to the substance. The coorindates of the points will be given as needed in the question statements below the diagram.
omit
Question 1
If heat is being added at the rate of 104 joules each second, then how much total energy is absorbed by the 186 grams of substance during the 9 minutes diagrammed between points A and F?
1.04 x 10
4
joules
9.36 x 10
2
joules
5.62 x 10
4
joules
3.37 x 10
6
joules
omit
Question 2
If the coordinates of point A are (0, -12) and the coordinates of point B are (39, 11), then what is the specific heat of the solid phase of the substance being graphed?
841 J/kg K
1982 J/kg K
948 J/kg K
502 J/kg K
omit
Question 3
What is the heat of fusion for the substance graphed if the coordinates of point C are (54, 11).
3.02 x 10
4
J/kg
2.9 x 10
2
J/kg
5.59 x 10
2
J/kg
8.39 x 10
3
J/kg
omit
Question 4
If the coordinates of point C are (54, 11) and the coordinates of point D are (234, 62), then what is the specific heat of the liquid phase of the substance being graphed?
1.01 x 10
3
J/kg K
5.13 x 10
3
J/kg K
3.11 x 10
1
J/kg K
1.96 x 10
3
J/kg K
omit
Question 5
What is the heat of vaporization for the substance graphed if the coordinates of point D are (234, 62) and the coordinates of point E are (479, 62).
3.35 x 10
4
J/kg
1.37 x 10
5
J/kg
4.74 x 10
3
J/kg
1.81 x 10
5
J/kg
omit
Question 6
If the coordinates of point E are (479, 62) and the coordinates of point F are (540, 103), then what is the specific heat of the vapor phase of the substance being graphed?
8.32 x 10
2
J/kg K
2.88 x 10
2
J/kg K
2.88 x 10
1
J/kg K
4.17 x 10
3
J/kg K
omit
Question 7
If the slope of the graph increases as you transition from one phase to the next, then the specific heat of the substance during the second phase
also increases
has no correlation to the slope
decreases
omit
Question 8
True or False
. The boiling point of this substance is 62 Kelvin.
True
False
omit
Question 9
True or False
. There is no change in temperature during a phase change: solid to liquid at the melting point or liquid to vapor at the boiling point.
False
True
omit
Question 10
True or False
. In this diagram, the ratio of the latent heat of vaporation to the latent heat of fusion is equivalent to the ratio of the time spent at the boiling point divided by the time spent at the melting point.
True
there is no correlation
False
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