1) ________ is isoelectronic with argon, and ________ is isoelectronic with neon.
A) P3-, N3-
B) P2-, N2-
C) P3+, N3+
D) N3-, P3-
E) P, N
2) The frequency of a photon that has an energy of 3.7 X 10-18 J is ________ s-1.
A) 5.6 X 1015
B) 1.8 X 10-16
C) 2.5 X 10-15
D) 5.4 X 10-8
E) 2.5 X 1015
3) Water gas is ________.
A) H2O and H2
B) CO2 and O2
C) H2O and CO2
D) H2O and CO
E) H2 and CO
4) A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH
solution. What is the pH before any base is added? The Ka of hydrocyanic acid is 4.9 x
10-10.
A) 5.07
B) 8.6 x 10-6
C) 9.31
D) 8.49
E) 3.1 x 108
5) For an isothermal process, S = ________.
A) q
B) qrev/T
C) qrev
D) Tqrev
E) q + w
6) Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
A) 4.56
B) 370
C) 1.51
D) 2.28
E) The density of the solution is needed to solve the problem.
7) The coordination number and oxidation number of the central atom in [Mn(CO)4Br2]
are ________ and ________, respectively.
A) 4, +1
B) 6, +1
C) 5, +2
D) 4, +2
E) 6, +2
8) Alkanes with ________ to ________ carbons are found in straight-run gasoline.
A) 2, 3
B) 5, 12
C) 1, 5
D) 9, 15
E) 20, 60
9) Using the VSEPR model, the molecular geometry of the central atom in IF5 is
________.
A) tetrahedral
B) square planar
C) square pyramidal
D) seesaw
E) trigonal bipyramidal
10) The ability of an atom in a molecule to attract electrons is best quantified by the
________.
A) paramagnetism
B) diamagnetism
C) electronegativity
D) electron charge-to-mass ratio
E) first ionization potential
11) Calcium oxide reacts with water in a combination reaction to produce calcium
hydroxide:
CaO (s) + H2O (l) → Ca(OH)2 (s)
In a particular experiment, a 2.00-g sample of CaO is reacted with excess water and
2.14 g of Ca(OH)2 is recovered. What is the percent yield in this experiment?
A) 107
B) 1.07
C) 2.88
D) 81.1
E) 93.3
12) The oxidation numbers of nitrogen in the nitride ion, hydrazine, ammonium cation,
and nitrate ion are ________, ________, ________, and ________, respectively.
A) -3, -2, -3, +5
B) +3, -2, -3, +5
C) +3, -2, +1, +3
D) -3, +2, +1, +5
E) -3, +2, -3, +3
13) Which one of the following compounds would produce an acidic solution when
dissolved in water?
A) Na2O
B) CaO
C) MgO
D) CO2
E) SrO