1) Which pair of elements below should be the most similar in chemical properties?
A) C and O
B) B and As
C) I and Br
D) K and Kr
E) Cs and He
2) Of the following elements, ________ has the most negative electron affinity.
A) P
B) Al
C) Si
D) Cl
E) B
3) The molecular weight of ethanol (C2H5OH), rounded to one decimal place, is
________ amu.
A) 45.1
B) 26.0
C) 25.0
D) 46.1
E) 29.0
4) A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be ________.
A) SO
B) SO2
C) S2O
D) S2O4
E) either SO2 or S2O4
5) CFC stands for ________.
A) chlorinated freon compound
B) chlorofluorocarbon
C) carbonated fluorine compound
D) caustic fluorine carbohydrate
E) carbofluoro compound
6) The process of a substance sticking to the surface of another is called
A) absorption
B) diffusion
C) effusion
D) adsorption
E) coagulation
7) The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0 oC is 4.9 x 10-10.
What is the pH of an aqueous solution of 0.050 M sodium cyanide (NaCN)?
A) 11.00
B) 3.00
C) 1.0 x 10-3
D) 9.9 x 10-12
E) 2.5 x 10-11
8) In ________, the bonds are the same but the spatial arrangement of the atoms is
different.
A) structural isomers
B) linkage isomers
C) coordination-sphere isomers
D) stereoisomers
E) resonance structures
9) The correct name for HNO3 is ________.
A) nitrous acid
B) nitric acid
C) hydronitroxide acid
D) nitroxide acid
E) nitrogen hydroxide
10) What mass in grams of hydrogen is produced by the reaction of 4.73 g of
magnesium with 1.83 g of water?
Mg (s) + 2H2O (l) → Mg(OH)2 (s) + H2 (g)
A) 0.102
B) 0.0162
C) 0.0485
D) 0.219
E) 0.204
11) Isotopes of hydrogen ________.
A) have the same atomic number and different mass numbers
B) have the same atomic number and the same mass number
C) have different atomic numbers and different mass numbers
D) have different atomic numbers and the same mass number
E) are exactly alike
12) Ham radio operators often broadcast on the 6-meter band. The frequency of this
electromagnetic radiation is ________ MHz.
A) 500
B) 200
C) 50
D) 20
E) 2.0
13) When two elements combine to form a compound, the greater the difference in
metallic character between the two elements, the greater the likelihood that the
compound will be ________.
A) a gas at room temperature
B) a solid at room temperature
C) metallic
D) nonmetallic
E) a liquid at room temperature