1) Heats of vaporization are greater than heats of fusion.
2) In the formula k = 0.693/t1/2, k is the decay constant.
3) The extent of ionization of a weak electrolyte is increased by adding to the solution a
strong electrolyte that has an ion in common with the weak electrolyte.
4) The energy of a metal ligand complex is higher than the energy of the separated
components.
5) Nitric oxide arises from internal combustion engines.
6) The neutron/proton ratio of stable nuclei increases with increasing atomic number.
7) H2SeO4 is called selenic acid.
8) The main component of air is oxygen.
9) Of the bonds bond is ________.
A) strongest/shortest
B) strongest/longest
C) weakest/shortest
D) weakest/longest
E) intermediate in both strength and length
10) If an atom gains 3 electrons to make an ion, what is the charge on that ion?
A) 3+
B) 1+
C) 2+
D) 1-
E) 3-
11) A nonpolar bond will form between two ________ atoms of ________
electronegativity.
A) different, opposite
B) identical, different
C) different, different
D) similar, different
E) identical, equal
12) The minimum number of unshared valence electron pairs in the ligands of a
coordination compound is ________.
A) 1
B) 2
C) 3
D) 4
E) 5
13) The empirical formula of a compound with molecules containing 12 carbon atoms,
14 hydrogen atoms, and 6 oxygen atoms is ________.
A) C12H14O6
B) CHO
C) CH2O
D) C6H7O3
E) C2H4O
14) Which combination will produce a precipitate?
A) NaC2H3O2 (aq) and HCl (aq)
B) NaOH (aq) and HCl (aq)
C) AgNO3(aq) and Ca(C2H3O2)2 (aq)
D) KOH (aq) and Mg(NO3)2 (aq)
E) NaF (aq) and HCl (aq)
15) The name of the ionic compound NH4CN is ________.
A) nitrogen hydrogen cyanate
B) ammonium carbonitride
C) ammonium cyanide
D) ammonium hydrogen cyanate
E) cyanonitride
16) A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to
make 12 mL of solution. The osmotic pressure of the solution is 7.55 atm at 25 oC. The
molecular weight of nicotine is ________ g/mol.
A) 28
B) 43
C) 50
D) 160
E) 0.60
17) The correct result (indicating the proper number of significant figures) of the
following problem is ________.
A) 113.73635
B) 113.736
C) 113.74
D) 113.7
E) 1.1 X 102
18) Calculate the mole fraction of phosphoric acid (H3PO4) in a 29.1% (by mass)
aqueous solution.
A) 0.0702
B) 0.0755
C) 0.140
D) 0.0351
E) The density of the solution is needed to solve the problem.
19) e represents ________.
20) Although CaCO3 has a relatively small solubility product, it is quite soluble in the
presence of ________.
21) Reaction rates are affected by reactant concentrations and temperature. This is
accounted for by the ________.
22) What is the coordination number of the iron atom in CaNa[Fe(CN)6]?
23) The combustion of carbon disulfide in the presence of excess oxygen yields carbon
dioxide and sulfur dioxide:
CS2 (g) + 3O2 (g) → CO2 (g) + 2SO2 (g)
The combustion of 15 g of CS2 in the presence of excess oxygen yields ________ g of
SO2.
24) Why does calcium carbonate dissolve in water containing carbon dioxide?
25) What isotope of what element is produced if krypton-81 undergoes beta decay?
26) Carbon-11, fluorine-18, o x ygen-15 and nitrogen-13 are all used in the clinical
diagnostic technique known as ________.