1. In which of the following pairs are both chemical properties?
a)
b)
c)
d)
e)
nonflammable and melts at 55ºC chemical/physical
good conductor of heat and is reddish brown in color physical/physical
reacts with chlorine and decomposes at 700ºC chemical/chemical
has a low density and is very hard physical/physical
flammable and high specific heat chemical/physical
2. Methane has a melting point of -183 oC and a boiling point of -162 oC. In what
state does methane exist at -145 oC?
a)
b)
c)
d)
e)
a solution
a gas
a liquid
a solid
a colloid
-183
solid
m.p.
-162
liquid
b.p.
-145
gas
o
C
3. Which of the following statements is NOT true of mixtures?
a)
b)
c)
d)
e)
Mixtures consist of two or more substances.
Mixtures can be separated by physical means.
Solutions are heterogeneous mixtures. (Solutions are homogeneous mixtures)
Properties of mixtures can vary with composition.
Homogeneous mixtures have the same physical properties throughout.
4. What are the chemical symbols for silver, copper, lead, and arsenic?
a)
b)
c)
d)
e)
Ag, Co, Ld, As
Au, Co, Pb, Ar
Au, Cu, Pb, As
Ag, Cu, Ld, Ar
Ag, Cu, Pb, As
5. How many 20 mg doses of the cholesterol-lowering agent Lipitor can be
supplied from 3.2 kg of this drug?
1 dose = 20 mg
a) 1.6 x 107
3.2 kg x
b) 1.6 x 106
dose
20 mg
x
c) 1.6 x 104 d) 1.6 x 105
1000 g x
1 kg
1000 mg
1g
1
e) 1.6 x 102
= 1.6 x 105 doses
6. Do the indicated arithmetic and give the answer to the correct number of
significant figures.
(5.8639 x 102) - (6.115 x 10-1)
a)
b)
c)
d)
e)
5.857785 x 102
5.8578 x 102
5.858 x 102
5.86 x 102
5.9 x 102
586.39
- 0.6115
585.7785
5 sig fig
7. Bromine is a liquid with a density of 3.12 g/mL. If 39.0 g of bromine are
needed for an experiment, what volume of bromine should be measured out?
a) 12.5 mL
b) 122 mL c) 8.00 x 10-2 mL
d) 125 mL e) 12.5 L
density = mass/volume
v = m = 39.0 g x 1 mL = 12.5 mL
d
3.12 g
8. The boiling point for ethanol is 78oC. What is the equivalent temperature in
kelvins?
a) 351
b) 328
c) 195
d) 110
e) -195
K = oC + 273
= 78 + 273 = 351
9. It takes 0.215 calories to heat one gram of aluminum by one degree Celsius.
If 320 calories are required to heat a sample of aluminum from 15.0 oC to
80.0 oC, what is the mass (g) of the aluminum?
a) 15.7
b) 9.67 x 105
c) 4.47 x 103
d) 22.9
e) 2.29
heat energy = m x c x ∆t
320 cal
= m x 0.215 cal x (80.0 – 15.0)oC
g x oC
m =
320
= 22.9 g
0.215 x 65.0
2
74
10. The anion 34 Se 2- contains:
a)
b)
c)
d)
e)
A = 74
40 protons, 34 neutrons, 34 electrons
40 protons, 34 neutrons, 36 electrons
36 protons, 40 neutrons, 36 electrons
34 protons, 40 neutrons, 34 electrons
34 protons, 40 neutrons, 36 electrons
Z = 34
protons = 34 neutrons = 74 – 34 electrons = 34 (Z) + 2
11. Two naturally occurring isotopes exist for the hypothetical element dippium.
25.0 percent of dippium atoms have a relative mass of 17.0 amu and 75.0
percent a relative mass of 21.3 amu. What is the atomic mass of dippium?
a)
b)
c)
d)
e)
17.8 amu
20.2 amu
19.1 amu
18.1 amu
38.3 amu
17.0 x 0.250 = 4.25
21.3 x 0.75 = 15.975
20.225 weighted average
12. Which of the following elements is incorrectly paired with the number of
valence electrons?
a)
b)
c)
37Rb
d)
e)
42Mo
16S
5B
1
6
3
6
25Mn 2
2
(only the 2 electrons of the 5s orbital
of Mo are considered valence electrons)
13. The correct electron configuration for Ge is
a)
b)
c)
d)
e)
1s22s22p63s23p2
1s22s22p63s23p64s24p2
1s22s22p63s23p63d104s24p2
1s22s22p63s23p64s23d104p4
1s22s22p63s23p64s23d104p2
3
14. The element barium is a(n) __________.
a)
b)
c)
d)
e)
alkali metal
metalloid
alkaline earth metal
nonmetal
transition metal
15. How many unpaired electrons are in Pd?
a) 1
4d8
b) 2
↑↓
↑↓
↑↓
c) 3
↑
↑
d) 4
e) 5
2 unpaired electrons in the 5 d orbitals
16. Of the following, which gives the correct order for atomic radius for
F, Mg, P, Na, and Si?
a)
b)
c)
d)
e)
Na > Mg > Si > P > F
Mg > Na > P > Si > F
F > Si > P > Na > Mg
Si > P > F > Na > Mg
F > P > Si > Mg > Na
17. Based on the octet rule, P can form a(n) anion with a charge of 3-.
a)
b)
c)
d)
e)
neutral atom, 0
cation, 3+
anion, 3anion, 3+
cation, 3-
18. What is the symbol for the hypochlorite ion?
a) ClO-
b) ClO2-
c) ClO3-
d) ClO4-
19. What is the chemical formula for tin (IV) phosphide?
a) Sn4P
b) Sn2P3
c) SnP4
d) Sn3P4
4
e) ClO5-
Sn4+ P3e) Sn4P3
20. What is the chemical name of KHSO4?
a) potassium hydrogen sulfide
b) potassium sulfide
c) potassium sulfite
d) potassium sulfate
e) potassium bisulfate
21. What are the charges on the monatomic ions formed by Ca, N, Al, Se, and Li?
a)
b)
c)
d)
e)
2+, 3-, 5-, 3-, 1+
2+, 3-, 3+, 2-, 1+
2-, 5-, 3-, 3+, 1+
2+, 5+, 3+, 3+,12+, 3+, 3-, 2-, 1+
22. In which of the following pairs of compounds are both members of the pair
ionic compounds?
a)
b)
c)
d)
e)
PCl3 and KBr
H2S and NCl3
Na2O and NiS both contain metal ions and monatomic anions
LiF and H2O
NiO and CO2
23. Which of the following compounds contains both ionic and covalent bonds?
a)
b)
c)
d)
e)
CO2
LiI
KCl
PH3
K2SO4 2 K+ and SO42-
(covalent bonds between S and O)
24. Which of these bonds is the most polar?
a) O – C
b) Br – Cl
c) F – F
d) O – O
5
e) C – N
25. Based on the Lewis structure for SiCl4 and the VSEPR theory, which of the
following statements is correct for this molecule.
••
: Cl :
tetrahedral geometry with
|
4 identical VSEPR groups
••
••
: Cl – Si – Cl :
polarity cancels
••
••
|
: Cl :
••
a)
b)
c)
d)
e)
The molecule has a trigonal pyramidal geometry.
The molecule is nonpolar
The molecule has identical bond angles of 120o.
There are several resonance structures for this molecule.
The molecule has no lone pairs.
26. Draw the Lewis structure for PF3 and apply the VSEPR theory to determine
which of the following statements is correct for this molecule.
..
..
..
:F– P– F:
••
••
|
: F:
••
a)
b)
c)
d)
e)
The molecule has a trigonal pyramidal geometry.
The molecule is nonpolar
The molecule has identical bond angles of 120o.
There are several resonance structures for this molecule.
The central atom contains no lone pairs of electrons.
27. Which of the following compounds contains a triple bond?
a) CO2
b) O2
c) PF3
d) H2S
e) N2
:N≡N:
6
28. Which of the following compounds has an angular or bent geometry?
linear
a) CO2
linear
b) O2
trigonal
pyramidal
bent
d) H2S
c) PF3
linear
e) N2
..
H– S:
|
H
29. Which statement is correct for the following structure?
the triple bond contains 2 π bonds,
all other bonds are sigma
:
a lone pair is needed to complete
the Lewis structure
a)
b)
c)
d)
e)
The structure represents a correct, complete Lewis structure.
The structure requires two lone pairs of electrons to be correct.
The structure contains 5 sigma bonds and 2 π bonds.
The structure contains 4 sigma bonds and 1 π bond.
The entire molecule is planar.
30. In which of the following pairs of polyatomic ions do both members of the
pair have the same charge?
a)
b)
c)
d)
e)
ammonium and phosphate
sulfate and nitrate
hydroxide and carbonate
bicarbonate and nitrite
chlorate and sulfite
+ / 32- / - / 2-/- / 2-
7