13.3: Vapor Pressure & Phase Diagrams
Chapter 13

Dr. Robert E. Belford




Question 1
Which set of curves would represent the effect of increasing temperature on the vapor pressure of a liquid?

(A)  A & B
(B)  C & D
(C)  All of them
(D)  None of them
 

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Question 2
The normal boiling point is defined as:
(A)  100 deg C
(B)  The boiling pt. at 1 atm
(C)  The boiling pt. on planet earth
(D)  none of the above
 

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Question 3
The normal boiling point of diethyl ether is 34.6oC and of water is 100oC. Which has the higher vapor pressure at 20oC?
(A)  water
(B)  diethyl ether
(C)  they are the same
(D)  it depends on your elevation
 

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Question 4
If one of the compounds in question 1 is diethyl ether and the other is water, curve___is diethyl ether and curve___is water.
(A)  A,B
(B)  B,A
(C)  C,D
(D)  D,C
 

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Question 5
The point X represents:

(A)  the critical point, where a solid, liquid and vapor can coexist
(B)  The critical point where the two fluid phases can not be distinguished
(C)  The triple point, where a solid, liquid and vapor can coexist
(D)  The triple point, where the fluid phases can not be separated
 

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Question 6
The point Y in the figure of question 6 represents
(A)  the critical point, where a solid, liquid and vapor can coexist
(B)  The critical point where the two fluid phases can not be distinguished
(C)  The triple point, where a solid, liquid and vapor can coexist
(D)  The triple point, where the fluid phases can not be separated
 

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Question 7
Region A of the figure in question 5 represents
(A)  solid
(B)  liquid
(C)  vapor
(D)  none of the above
 

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Question 8
Region B of the figure in question 5 represents
(A)  solid
(B)  liquid
(C)  vapor
(D)  none of the above
 

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Question 9
Region C of the figure in question 5 represents
(A)  solid
(B)  liquid
(C)  vapor
(D)  none of the above
 

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Question 10
The negative slope between regions A and B of the figure in question 5 indicates:
(A)  the solid is more dense than the liquid
(B)  the liquid is more dense the the solid
(C)  the vapor is more dense than the liquid
(D)  the vapor is more dense than the solid
 

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Question 11
The figure in quesion 5 is consitent with a phase diagram for which compound
(A)  carbon dioxide
(B)  sodium
(C)  water
(D)  carbon dioxide and water
 

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Question 12
The compound in question 5 sublimes at pressures:
(A)  greater than deg O C
(B)  Pressures greater than 1.0 atm
(C)  pressures between 0.0060 and 1.00 atm
(D)  pressures less than 0.0060 atm
 

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Question 13
Consider a 1 atm isobar for the compound in question 5. Moving left to right in region A represents
(A)  freezing
(B)  melting
(C)  heating supercooled ice
(D)  none of the above
 

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Question 14
Consider a 1 atm isobar for the compound in question 5. Adding heat to a substance in region A causes it to warm, what happens when you reach the line between region A & B?
(A)  it boils
(B)  it melts
(C)  it freezes
(D)  it continues to warm up
 

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Question 15
Consider a 1 atm isobar for the compound in question 5. Moving left to right in region B represents
(A)  melting
(B)  boiling
(C)  heating liquid water
(D)  cooling liquid water
 

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Question 16

Consider a 1 atm isobar for the compound in question 5. Adding heat to a substance in region B causes it to warm, what happens when you reach the line between region B & C?

(A)  it continues to warm
(B)  it condenses
(C)  it boils
(D)  none of the above
 

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Question 17
Consider a 1 atm isobar for the compound in question 5. Moving left to right in region C represents
(A)  cooling water
(B)  heating liquid water
(C)  heating ice
(D)  heating steam
 

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Question 18
At what pressure can liquid, solid and gaseous water coexist?
(A)  218 atm
(B)  1.00 atm
(C)  0.0060 atm
(D)  none of the above
 

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