Practice Problems
Phase Diagrams
Directions:
On this worksheet you will be working with phase diagrams. 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 115 joules each second, then how much total energy is absorbed by the 180 grams of substance during the 5 minutes diagrammed between points A and F?
3.45 x 10
^{4}
joules
2.07 x 10
^{6}
joules
6.21 x 10
^{3}
joules
5.75 x 10
^{2}
joules
omit
Question 2
If the coordinates of point A are (0, -12) and the coordinates of point B are (21, 6), then what is the specific heat of the solid phase of the substance being graphed?
745 J/kg K
242 J/kg K
1150 J/kg K
2236 J/kg K
omit
Question 3
What is the heat of fusion for the substance graphed if the coordinates of point C are (36, 6).
9.58 x 10
^{3}
J/kg
6.39 x 10
^{2}
J/kg
3.11 x 10
^{2}
J/kg
2.3 x 10
^{4}
J/kg
omit
Question 4
If the coordinates of point C are (36, 6) and the coordinates of point D are (136, 49), then what is the specific heat of the liquid phase of the substance being graphed?
2.75 x 10
^{3}
J/kg K
2.02 x 10
^{3}
J/kg K
2.02 x 10
^{1}
J/kg K
1.49 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 (136, 49) and the coordinates of point E are (267, 49).
2.71 x 10
^{3}
J/kg
1.47 x 10
^{4}
J/kg
8.37 x 10
^{4}
J/kg
9.66 x 10
^{4}
J/kg
omit
Question 6
If the coordinates of point E are (267, 49) and the coordinates of point F are (300, 100), then what is the specific heat of the vapor phase of the substance being graphed?
6.27 x 10
^{2}
J/kg K
1.34 x 10
^{1}
J/kg K
2.05 x 10
^{3}
J/kg K
4.13 x 10
^{2}
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
decreases
also increases
has no correlation to the slope
omit
Question 8
True or False
. The boiling point of this substance is 49 Kelvin.
False
True
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.
there is no correlation
False
True
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