1) The dissolution of 1.0 mol of ________ to 1.0 L of water at 25 °C would yield the
most acidic solution.
A) SO3
B) CO2
C) CO
D) MgO
E) CaO
2) Calculate the pH of a solution that is 0.278 M in sodium formate (NaHCO2) and
0.222 M in formic acid (HCO2H). The Ka of formic acid is 1.77 x 10-4.
A) 3.843
B) 3.647
C) 13.90
D) 10.16
E) 4.954
3) Of the elements below, ________ has the highest melting point.
A) Ca
B) K
C) Fe
D) Na
E) Ba
4) The Lewis structure of PF3 shows that the central phosphorus atom has ________
nonbonding and ________ bonding electron pair(s).
A) 2, 2
B) 1, 3
C) 3, 1
D) 1, 2
E) 3, 3
5) Given that the average bond energies for C-H and C-Br bonds are 413 and 276
kJ/mol, respectively, the heat of atomization of bromoform (CHBr3) is ________
kJ/mol.
A) 1241
B) 689
C) -689
D) 1378
E) -1378
6) Which of the following is classified as a supercritical fluid?
A) water
B) xylene
C) toluene
D) hydrogen peroxide
E) none of the above
7) The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is
the binding energy (in J) of a 62Co nucleus? (The mass of a cobalt-62 nucleus is
61.9341 amu.)
A) 8.46 x 10-11
J
B) 8.46 x 10-19
J
C) 5.09 x 1016
J
D) 4.15 x 10-9
J
E) -1.12 x 10-9
J
8) Which species below is the nitrate ion?
A) NO2
–
B) NO3
–
C) ClO3
–
D) ClO4
–
E) MnO4
–
9) Which one of the following statements is true about the equilibrium constant for a
reaction if G o for the reaction is negative?
A) K = 0
B) K = 1
C) K > 1
D) K < 1
E) More information is needed.
10) Valence bond theory does not address the issue of ________.
A) excited states of molecules
B) molecular shape
C) covalent bonding
D) hybridization
E) multiple bonds
11) The reaction of 50 mL of Cl2 gas with 50 mL of CH4 gas via the equation:
Cl2 (g) + CH4 (g) → HCl (g) + CH3Cl (g)
will produce a total of ________ mL of products if pressure and temperature are kept
constant.
A) 100
B) 50
C) 200
D) 150
E) 250
12) SO2 (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The
partial pressure of CO2 in the container was ________ atm.
A) 6.78
B) 2.76
C) 1.60
D) 0.192
E) 4.02
13) In the ________ liquid crystalline phase, the component molecules exhibit only one
dimensional ordering.
A) nematic
B) smectic A
C) smectic B
D) smectic C
E) cholesteric
14) In a saturated solution of a salt in water, ________.
A) the rate of crystallization > the rate of dissolution
B) the rate of dissolution > the rate of crystallization
C) seed crystal addition may cause massive crystallization
D) the rate of crystallization = the rate of dissolution
E) addition of more water causes massive crystallization
15) In the symbol below, x = ________.
Cl
A) 17
B) 34
C) 16
D) 36
E) not enough information to determine
16) The vapor pressure of any substance at its normal boiling point is
A) 1 Pa
B) 1 torr
C) 1 atm
D) equal to atmospheric pressure
E) equal to the vapor pressure of water
17) Of the following, ΔH°f is not zero for ________.
A) Sc (g)
B) Si (s)
C) P4 (s, white)
D) Br2 (l)
E) Ca (s)