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WorksheetsEnergy and Phase Diagram
Total questions: 24
Worksheet time: 19mins
Name
Class
Date
1.
Water exists as a _____________ at 700 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
2.
What phase change(s) may occur at pressures below 4.58 mmHg?
a)
sublimation/deposition
b)
melting/freezing
c)
all phase changes are possible at these pressures
d)
vaporization/condensation
3.
The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg. In order, what changes occur?
a)
deposition, melting
b)
sublimation, melting
c)
condensation, freezing
d)
deposition, freezing
4.
Based on this phase diagram, which state is the most dense?
a)
gas
b)
solid
c)
liquid
d)
solid and liquid have equal densities
5.
Based on its phase diagram, which is the most dense state for CO2?
a)
gas
b)
liquid
c)
solid
d)
supercritical fluid
6.
What is true regarding CO2 for temperatures above 31 °C?
a)
It can never be liquified.
b)
It decomposes.
c)
It has a high pressure.
d)
It is a plasma.
7.
At 10 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?
a)
freezing, then condensation
b)
melting only
c)
sublimation only
d)
melting, then boiling
8.
What is the normal melting point of CO2?
a)
-78.5 °C
b)
-56.7 °C
c)
31 °C
d)
It doesn't have a normal melting point.
9.
What is the normal boiling point of CO2?
a)
-78.5 °C
b)
-56.7 °C
c)
31 °C
d)
It doesn't have a normal boiling point.
10.
What state of matter is X?
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
11.
What state of matter is Y?
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
12.
What state of matter is Z?
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
13.
What change occurs from F to E?
a)
sublimation
b)
deposition
c)
melting
d)
condensation
14.
What change occurs from E to C?
a)
sublimation
b)
freezing
c)
melting
d)
boiling
15.
What change occurs from C to D?
a)
condensation
b)
vaporization
c)
melting
d)
sublimation
16.
What is the normal boiling point of this substance?
a)
150 °C
b)
100 °C
c)
-50 °C
d)
0 °C
17.
What is the normal melting point of this substance?
a)
150 °C
b)
100 °C
c)
-50 °C
d)
0 °C
18.
What is point A?
a)
triple point
b)
critical point
c)
equilibrium point
d)
normal melting point
19.
What is point B?
a)
triple point
b)
critical point
c)
equilibrium point
d)
normal melting point
20.
Above the temperature of point B, this substance exists as a ____________.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
21.
Below the temperature of point B, this substance can exist as a ____________.
a)
solid only
b)
liquid only
c)
gas only
d)
either a solid, liquid or gas
22.
At 0.10 atm, what phase(s) can exist?
a)
solid, liquid or gas
b)
liquid or gas
c)
solid only
d)
gas only
23.
Water exists as a _____________ at 3 mmHg and 50 °C.
a)
solid
b)
liquid
c)
gas
d)
supercritical fluid
24.
Which statement is true for carbon dioxide at -60 °C?
a)
All three phases are possible.
b)
It can exist as a solid or a gas, depending on pressure.
c)
It is a solid.
d)
With enough pressure it can be melted.
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