1) Which one of the following atoms has the largest radius?
A) In
B) Sn
C) Sb
D) Te
E) I
2) What is the F€Xe€F bond angle in XeF2?
A) 180°
B) 90°
C) 109.5°
D) 120°
E) 60°
3) The ________ orbital is degenerate with 5py in a many-electron atom.
A) 5s
B) 5px
C) 4py
D) 5dxy
E) 5d2
4) The conjugate base of H2PO4
– is ________.
A) PO4
3-
B) H2PO4
C) H3PO4
D) HPO4
2-
E) none of the above
5) A molecular orbital can accommodate a maximum of ________ electron(s).
A) 1
B) 2
C) 4
D) 6
E) 12
6) The value of ΔH° for the reaction below is +128.1 kJ:
CH3OH (l) → CO (g) + 2H2 (g)
How many kJ of heat are consumed when 5.10 g of H2 (g) is formed as shown in the
equation?
A) 162 kJ
B) 62.0 kJ
C) 128 kJ
D) 653 kJ
E) 326 kJ
7) The density of air at STP is 1.285 g/L. Which of the following cannot be used to fill a
balloon that will float in air at STP?
A) CH4
B) NO
C) Ne
D) NH3
E) HF
8) Chromium and chlorine form an ionic compound whose formula is CrCl3. The name
of this compound is ________.
A) chromium chlorine
B) chromium (III) chloride
C) monochromium trichloride
D) chromium (III) trichloride
E) chromic trichloride
9) The concentration of S2O8
2- remaining at 800 s is ________ M.
A) 0.046
B) 0.076
C) 4.00 x 10-3
D) 0.015
E) 0.041
10) Of the following elements, ________ has the most negative electron affinity.
A) F
B) Cl
C) Br
D) H
E) I
11) Which of the following correctly represents the second ionization of copper?
A) Cu (g) → Cu+ (g) + e–
B) Cu+ (g) → Cu2+ (g) + e–
C) Cu– (g) + e– → Cu2- (g)
D) Cu+ (g) + e– → Cu2+ (g)
E) Cu+ (g) + e– → Cu (g)
12) Calculate the pH of a 0.500 M aqueous solution of NH3. The Kb of NH3 is 1.77 x
10-5.
A) 8.95
B) 11.47
C) 2.53
D) 11.77
E) 2.23
13) For molecules with only one central atom, how many lone pairs on the central atom
guarantees molecular polarity?
A) 1
B) 2
C) 1 or 2
D) 3
E) 1 or 3
14) The point in a titration at which the indicator changes is called the ________.
A) setpoint
B) indicator point
C) standard point
D) end point
E) volumetric point