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1) Which one of the following is the highest temperature?
A) 38 °C
B) 96 °F
C) 302 K
D) none of the above
E) the freezing point of water
2) The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample
remain after 9.50 years?
A) 0.565
B) 7.03 x 10-22
C) 7.076
D) 1.095
E) 1.435
3) Magnesium and sulfur form an ionic compound with the formula ________.
A) MgS
B) Mg2S
C) MgS2
D) Mg2S2
E) Mg2S3
4) Based on the octet rule, magnesium most likely forms a ________ ion.
A) Mg2+
B) Mg2-
C) Mg6-
D) Mg6+
E) Mg-
5) Calculate the freezing point of a 0.09500 m aqueous solution of glucose. The molal
freezing-point-depression constant of water is 1.86 oC/m.
A) 0.0475
B) 0.106
C) -0.0562
D) -0.177
E) -0.354
6) The minimum number of carbons necessary for a hydrocarbon to form a branched
structure is ________.
A) 4
B) 6
C) 3
D) 9
E) 12
7) The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is ________.
A) 15.0
B) 1.00 x 1024
C) 4.46 x 1021
D) 1.67
E) 2.76 x 10-24
8) The molar concentration of hydronium ion in pure water at 25 oC is ________.
A) 0.00
B) 1.0 x 10-7
C) 1.0 x 10-14
D) 1.00
E) 7.00
9) The oxidation state of silicon in SiO4
4- is ________.
A) 0
B) +6
C) +2
D) +4
E) -4
10) The Ka of hypochlorous acid (HClO) is 3.00 x 10-8. What is the pH at 25.0 oC of an
aqueous solution that is 0.0200 M in HClO?
A) +2.45
B) -2.45
C) -9.22
D) +9.22
E) +4.61
11) The molecular weight of 2-propanol (C3H7OH), known as rubbing alcohol, is
________ amu (rounded to one decimal place).
A) 59.1
B) 29.0
C) 60.1
D) 12.0
E) 34.0
12) Acid rain typically has a pH of about ________.
A) 7
B) 5
C) 4
D) 2
E) 1
