1) Round the number 3456.5 to two significant figures.
A) 3400.0
B) 3400
C) 3000
D) 3500
E) 3000.0
2) Of the following, which is the strongest acid?
A) HIO4
B) HIO3
C) HIO2
D) HIO
E) The acid strength of all of the above is the same.
3) Silver ions can be precipitated from aqueous solutions by the addition of aqueous
chloride:
Ag+ (aq) + Cl– (aq) → AgCl (s)
Silver chloride is virtually insoluble in water so that the reaction appears to go to
completion. How many grams of solid NaCl must be added to 25.0 mL of 0.149 M
AgNO3 solution to completely precipitate the silver?
A) 3.73 x 10-3
B) 6.37 x 10-5
C) 0.218
D) 0.0637
E) 1.57 x 104
4) As the number of covalent bonds between two atoms increases, the distance between
the atoms ________ and the strength of the bond between them ________.
A) increases, increases
B) decreases, decreases
C) increases, decreases
D) decreases, increases
E) is unpredictable
5) A disproportionation reaction is one in which ________.
A) a single element is both oxidized and reduced
B) a compound is separated into its constituent elements
C) the ratio of combination of two elements in a compound changes
D) aqueous ions combine to form an insoluble salt
E) an insoluble salt separates into ions
6) Which one of the following species is a potential polydentate ligand (chelating
agent)?
A) NH3
B) Cl–
C) CN–
D) H2O
E) C2O4
2-
7) The value of Keq for the equilibrium
H2 (g) + I2 (g) 2HI (g)
is 54.0 at 427 oC. What is the value of Keq for the equilibrium below?
HI (g) H2 (g) + I2(g)
A) 27
B) 7.35
C) 0.136
D) 2.92 x 103
E) 3.43 x 10-4
8) Molecular Orbital theory correctly predicts paramagnetism of oxygen gas, O2. This
is because ________.
A) the bond order in O2 can be shown to be equal to 2.
B) there are more electrons in the bonding orbitals than in the antibonding orbitals.
C) the energy of the π2p MOs is higher than that of the σ2p MO
D) there are two unpaired electrons in the MO electron configuration of O2
E) the O-O bond distance is relatively short
9) When aqueous solutions of ________ are mixed, a precipitate forms.
A) NiBr2 and AgNO3
B) NaI and KBr
C) K2SO4 and CrCl3
D) KOH and Ba(NO3)2
E) Li2CO3 and CsI
10) Ethers can be made by condensation of two ________ molecules by splitting out a
molecule of water.
A) alkyne
B) alcohol
C) ketone
D) aldehyde
E) olefin
11) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of H o for the decomposition of gaseous sulfur dioxide to solid elemental
sulfur and gaseous oxygen,
SO2 (g) –> S (s,rhombic) + O2 (g)
is ________ kJ/mol.
A) 0.0
B) +135.0
C) -135.90
D) -269.9
E) +269.9