1) What is the oxidation state of chromium in [Cr(H2O)4Cl2]+?
A) 0
B) +2
C) +3
D) -2
E) -3
2) Elements in the same group of the periodic table typically have ________.
A) similar mass numbers
B) similar physical properties only
C) similar chemical properties only
D) similar atomic masses
E) similar physical and chemical properties
3) How many single covalent bonds must a chlorine atom form to have a complete octet
in its valence shell?
A) 0
B) 1
C) 2
D) 3
E) 4
4) The phase diagram of a substance is given above. The region that corresponds to the
solid phase is ________.
A) w
B) x
C) y
D) z
E) x and y
5) A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0
mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is ________ atm.
A) 9.1
B) 6.5
C) 1.04
D) 0.74
E) 1.86
6) Why does the upper atmosphere contain only very little dissociated nitrogen?
A) Most of the nitrogen is in the troposphere and not in the upper atmosphere.
B) The dissociated nitrogen very rapidly diffuses out of the atmosphere and into space.
C) Nitrogen atoms are extremely reactive and so react with other substances
immediately upon their formation.
D) The bond energy of nitrogen is very high and it does not absorb radiation very
efficiently.
E) There is no N2 in the upper atmosphere.
7) A 25.5-g piece of cheddar cheese contains 37% fat, 28% protein, and 4%
carbohydrate. The respective fuel values for protein, fat, and carbohydrate are 17, 38,
and 17 kJ/g, respectively. The fuel value for this piece of cheese is ________ kJ.
A) 450
B) 330
C) 790
D) 99
E) 260
8) What is the formula of the compound formed between strontium ions and nitrogen
ions?
A) SrN
B) Sr3N2
C) Sr2N3
D) SrN2
E) SrN3
9) A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of
sodium hypochlorite in water sufficient to yield 1.00 L of solution. The addition of 0.05
mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not
decrease drastically because the HCl reacts with the ________ present in the buffer
solution. The Ka of hypochlorous acid is 1.36 x 10-3.
A) H2O
B) H3O+
C) hypochlorite ion
D) hypochlorous acid
E) This is a buffer solution: the pH does not change upon addition of acid or base.
10) Calculate the percent ionization of nitrous acid in a solution that is 0.260 M in
nitrous acid. The acid dissociation constant of nitrous acid is 4.50 x 10-4.
A) 1.17 x 10-4
B) 0.0450
C) 4.16
D) 0.314
E) 5.78
11) Which of the following has eight valence electrons?
A) Ti4+
B) Kr
C) Cl–
D) Na+
E) all of the above
12) The units of specific heat are ________.
A) K/J or °C/J
B) J/K or J/°C
C) J/g-K or J/g-°C
D) J/mol
E) g-K/J or g-°C/J
13) The element in the periodic table that looks like a metal, is a poor thermal
conductor, and acts as an electrical semiconductor is ________.
A) Sn
B) B
C) As
D) Si
E) Ge