Phase Diagrams
Unit Cells
Colligative + Solubility
100
Conversion from a solid to gas is _____.
Conversion from a gas to solid is _____.
Sublimation; deposition.
100
Match the following:
(A) simple cubic (B) body-centered cubic (C) face-centered cubic
(I) 4 atoms/cell, 12 nearest neighbors (II) 1 atom/cell, 6 nearest neighbors (III) 2 atoms/cell, 8 nearest neighbors
(A)-(II), (B)-(III), (C)-(I)
100
Which solid is most soluble in water at 25 ºC?
(A) AgNO3 (B) CaCO3 (C) PbO (D) ZnS
(A) AgNO3
200
The point at which the solid, liquid, and vapor may all exist in equilibrium is called the _____.
Triple point
200
Which of the following structures has the greatest density, given the same radius and elements involved?
(A) Simple cubic
(B) Body-centered cubic
(C) Hexagonal
(D) Face-centered cubic
(D); face-centered cubic is also called cubic closest-packed
200
Which cation forms an insoluble chloride and an insoluble sulfide?
(A) Ba2+ (B) Cu2+ (C) Mn2+ (D) Pb2+
(D) Pb2+
300
The point past which there is no distinction between gaseous and liquid phases and the meniscus disappears is called the _____. The combined phase is called _____.
Critical point; supercritical fluid.
300
How many nearest neighbors ("coordination number") does each carbon atom in diamond have?
4
300
Which 0.10 M electrolyte solution will show the smallest depression in freezing point?
(A) HCl (B) NaBr (C) KNO3 (D) MgSO4
(D) MgSO4
400
(A)
400
(D) CeO2
400
An aqueous solution of potassium sulfate (K2SO4) has a freezing point of –2.24 ºC. What is its molality? (Kf = 1.86 ºC•m–1)
(A) 0.401 m (B) 0.602 m
(C) 1.20 m (D) 4.17 m
(A) 0.401 m
500
(D)
500
An oxide of rhenium crystallizes with eight rhenium atoms at the corners of the unit cell and 12 oxygen atoms on the edges between them. What is the formula of this oxide?
(A) ReO (B) Re2O3 (C) ReO2 (D) ReO3
(D)
500
A white ionic solid is dissolved in water. Addition of a solution of sodium chloride to this solution results in a white precipitate. What was the cation in the original ionic solid?
(A) Na+ (B) Fe3+ (C) Ag+ (D) Sr2+
(C) Ag+