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1) Which one of the following is not amphoteric?
A) Al(OH)3
B) Ca(OH)2
C) Cr(OH)3
D) Zn(OH)2
E) Sn(OH)2
2) Structural changes around a double bond in the ________ portion of the rhodopsin
molecule trigger the chemical reactions that result in vision.
A) protein
B) opsin
C) retinal
D) cones
E) rods
3) The value of Keq for the equilibrium
H2 (g) + I2 (g) 2HI (g)
is 794 at 25 oC. At this temperature, what is the value of Keq for the equilibrium below?
HI (g) H2 (g) + I2 (g)
A) 1588
B) 28
C) 397
D) 0.035
E) 0.0013
4) What is the predominant intermolecular force in BaBr2?
A) ionic bonding
B) ion-dipole attraction
C) dipole-dipole attraction
D) hydrogen bonding
E) London-dispersion forces
5) Given the following reaction at equilibrium at 300.0 K:
NH4HS (s) NH3 (g) + H2S (g)
If pNH3 = pH2S = 0.105 atm, Kp = ________.
A) .0110
B) 4.99 x 10-4
C) .105
D) .0821
E) 5.66 x 10-3
6) Which equation correctly represents the first ionization of calcium?
A) Ca (g) → Ca+ (g) + e-
B) Ca (g) → Ca- (g) + e-
C) Ca (g) + e- → Ca- (g)
D) Ca- (g) → Ca (g) + e-
E) Ca+ (g) + e- → Ca (g)
7) The volume of a regular cylinder is V =r2h. Using the value 3.1416 for the constant ,
the volume (cm3) of a cylinder of radius 2.34 cm and height 19.91 cm expressed to the
correct number of significant figures is ________.
A) 342.49471
B) 342.495
C) 342.49
D) 343
E) 342
8) Calculate the mole fraction of nitric acid of an 8.37% (by mass) aqueous solution of
nitric acid.
A) 0.0199
B) 0.0203
C) 0.0398
D) 0.00995
E) The density of the solution is needed to solve the problem.
9) Which form of elemental sulfur is the most stable at room temperature?
A) rhombic sulfur
B) monoclinic
C) hexagonal
D) triclinic
E) tetraclinic
10) The molar solubility of ________ is not affected by the pH of the solution.
A) Na3PO4
B) NaF
C) KNO3
D) AlCl3
E) MnS
11) ________ has the lowest boiling point of any substance known.
A) Ne
B) He
C) Ar
D) Kr
E) Rn
12) In the symbol below, x = ________.
O
A) 17
B) 8
C) 6
D) 7
E) not enough information to determine
13) Which of the following compounds would you expect to be ionic?
A) C2H6
B) NH3
C) H2O2
D) LiBr
E) None of the above.
14) The wavelength of a photon that has an energy of 5.25 X 10-19 J is ________ m.
A) 3.79 X 10-7
B) 2.64 X 106
C) 2.38 X 1023
D) 4.21 X 10-24
E) 3.79 X 107
15) The amount of gas that occupies 60.82 L at 31.0 °C and 367 mm Hg is ________
mol.
A) 1.18
B) 0.850
C) 894
D) 11.6
E) 0.120
16) The concentration of water vapor in a sample of air that has a partial pressure of
water of 1.20 torr and a total pressure of air of 695 torr is ________ ppm.
A) 1.7 103
B) 1.7
C) 0.17
D) 5.8 10-4
E) 0.58
17) There are ________ unpaired electrons in the Lewis symbol for an oxygen atom.
A) 0
B) 1
C) 2
D) 4
E) 3
