Chemistry 11 Spring 2012
Examination #1
For the first portion of this exam, select the best answer choice for the questions below
and mark the answers on your scantron. Then answer the free response questions that
follow (100 pts. total; multiple choice 2 pts. each).
1.
A covalent bond is associated with which of the following?
A.
B.
C.
D.
E.
2.
The region where the outermost electrons are found is called
A.
B.
C.
D.
E.
3.
an excited state
a ground state
an orbital
the valence shell
a core
The term used to describe the conversion of solid to a gas is called
A.
B.
C.
D.
E.
4.
interactions between nuclei
equal sharing of electrons
unequal sharing of electrons
the transfer of electrons
interaction between a nonmetal and nonmetal
sublimation
evaporation
condensation
deposition
gas can never be converted to a solid
The doctor orders administration of a drug at 120. mg per 1000. mL at 400.
mL/24 hours. How many mg of drug will the patient receive every 8.0 hours?
A.
B.
C.
D.
E.
16.0 mg
0.0625 mg
16 mg
4.0 mg
48 mg
1
For Questions 5 – 7, reference the structure of amoxicillin below:
5.
Amoxicillin is an antibiotic which is used to treat bacterial infections especially in
children. Based on your knowledge of VSEPR, which of the following
geometries is NOT present in amoxicillin?
CH3
CH3 OH
C
S
HC
C
O
H
H
C
C
N
C
O
NH
O
C
H
C
C
H
C
HC
CH
NH 2
C
OH
A.
B.
C.
D.
E.
C
H
trigonal planar
tetrahedral
bent
trigonal pyramidal
All of the above are present in amoxicillin
6.
Select “A” for True OR “B” for False regarding the following statement:
amoxicillin does not possess any linear geometry.
7.
Select “A” for True OR “B” for False regarding the following statement:
Amoxicillin is a predominantly nonpolar molecule.
8.
Convert 325 K to Fahrenheit.
A.
B.
C.
D.
E.
11.1°F
52°F
126°F
163°F
617°F
2
9.
Atoms of the same element have the same number of _________, called the
_____________.
A.
B.
C.
D.
E.
10.
electrons, atomic number
protons, atomic number
neutrons, atomic number
neutrons, mass number
isotopes, weighted average mass
Two students, Garrison and Isabella, determined the mass of an object on two
different balances. The accepted mass of the object was 2.355 g. Garrison
obtained values of 2.531 g, 2.537 g, 2.535 g and 2.533 g. Isabella obtained values
of 2.350 g, 2.404 g, 2.296 g and 2.370 g. Which statement best describes the
results that were obtained by Garrison and Isabella?
I.
II.
III.
IV.
A.
B.
C.
D.
E.
11.
Only II is correct.
Only III is correct.
Only IV is correct.
Both II and III are correct.
Both I and IV are correct.
What is the total number of “s” electrons in a neutral atom of Sn (atomic # 50)?
A.
B.
C.
D.
E.
12.
Garrison obtained the better accuracy.
Isabella obtained the better accuracy.
Garrison obtained the better precision.
Isabella obtained the better precision.
2
4
17
50
10
What is the mass number for strontium that has 50 neutrons and 36 electrons?
A.
B.
C.
D.
E.
86.2
74
86
88
88.10
3
13.
Determine the expected electronic configuration for Po-2:
A.
B.
C.
D.
E.
14.
1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6 5s2 5d10 5p6 6s2 6f14 6d10 6p4
1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6 5s2 5d10 5p6 6s2 6f14 6d10 6p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p4
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
Five 1 peseta coins from Spain were dropped into a graduated cylinder containing
20.20 mL water. The volume of the water increased to 22.05 mL. A single coin
had a mass of 0.99 gram. What is the identity of the metal used for the Spanish 1
peseta coins? Assume all coins weigh the same.
density of aluminum = 2.7 g/mL
density of zinc = 7.1 g/mL
density of copper = 9.0 g/mL
density of silver = 10.0 g/mL
density of lithium = 0.535 g/mL
A.
B.
C.
D.
E.
15.
How much heat must you add to 150 mL of ethanol to increase its temperature
from 0.0 ºC to 50.0 ºC? Density of ethanol is 0.79 g/mL and specific heat of
ethanol is 0.58 cal/g. ºC
A.
B.
C.
D.
E.
16.
Aluminum
Copper
Zinc
Silver
Lithium
3.4 kcal
3437 kcal
4.4 kcal
4350 kcal
5.9 kcal
Express 6.2030 x 10-4 as an “ordinary” decimal number.
A.
B.
C.
D.
E.
62030
6203
6203.0
0.000062030
0.00062030
4
17.
A student determined the density of their aluminum cylinder to be 2.684 g/mL.
What is the percent error of their measurement, if the actual density of aluminum
is 2.702 g/mL?
A.
B.
C.
18.
D.
E.
0.6662 %
99.33 %
Determine the correct listing of the listed atoms in terms of decreasing atomic
radius: Na, Li, N, F, Cs, and Rb.
A.
B.
C.
D.
E.
19.
–0.01800 %
0.01800 %
0.006662 %
Rb > Cs > Na > Li > F >N
Cs > Rb > N > Li > F > Na
Cs > Rb > Na > Li > F > N
F > Cs > Li > Na > N > Rb
Cs > Rb > Na > Li > N > F
Report the following result to the correct number of significant figures:
8.771 x (4.17 x 10-6 + 0.19 x 10-5)
A.
B.
C.
20.
5.3 x 10-5
0.53 x 10-4
3.8 x 10-5
D.
E.
0.0053
0.0038
Arrange the following in the order of increasing electronegativity:
Ca, Al, Mg, F, Cl
A.
B.
C.
D.
E.
Ca < Cl < Al < Mg < F
Ca < Mg < F < Al < Cl
F < Cl < Al < Mg < Ca
Cl < F < Mg < Ca < Al
Ca < Mg < Al < Cl < F
END OF MULTIPLE CHOICE!
5
21.
22.
(20 pts. total; 2 pts. each) Write the name/chemical formula for each of the
following listed below:
A.
calcium bromide
CaBr2
B.
CoCl2
cobalt(II) chloride
C.
sodium nitride
Na3N
D.
NH4C2H3O2
ammonium acetate
E.
Sb2(SO4)3
antimony(III) sulfate
F.
iron(III) sulfide
Fe2S3
G.
K3PO4
potassium phosphate
H.
Cesium nitrite
CsNO2
I.
P 2 O5
diphosphorus pentoxide
J.
CO
carbon monoxide
(12 points). Write the word, phrase or number in the blank that will complete the
statement or answer the question.
A.
The term used to describe elements that show characteristics of both a
metal and a nonmetal are called metalloids.
B.
Isotopes of an element have the same number of protons and electrons
but different number of neutrons. Therefore, their atomic numbers are
the same although their mass numbers differ.
C.
The place in an atom where there is a high probability of finding an
electron is called an orbital.
D.
The elements in this group exist as solids, liquids, and gases. These groups
of elements are called halogens.
E.
When naming compounds involving these transition metals as cations,
Roman numerals are not included in parentheses. These metals are Zn,
Cd, and Ag.
F.
Deposition is the term used to describe the conversion of gas to a solid.
6
23.
(28 pts. total; 7 pts. each) Consider each of the following ions/molecules shown
below and write your final structures in the boxes provided:
A.
B.
C.
D.
Beginning with the best Lewis dot structure, use VSEPR theory to
draw each of the listed species, including resonance where
appropriate. Don’t forget to include lone pairs!
Describe the geometry about EACH central atom. Include both
electronic and molecular geometries.
Give the approximate bond angle(s) around each central atom.
Determine whether the overall species is polar or nonpolar.
i.
ii.
H2CO
CH3COOH
iii.
iv.
C2O42H3PO4
NOTE: Terminal atoms are assumed to have an octet of electrons (excluding
hydrogens)-omitted for the sake of clarity!
7
O
O
H
C
H
H
H
Structure #1
approx. bond angle: 120 degrees
polar or nonpolar?
2
polar
2
2
O
O
C C
O
O
H
(C1) tetrahedral
electronic geometry: (C ) trigonal planar
2
(O) tetrahedral
(C1) tetrahedral
molecular geometry: (C ) trigonal planar
2
(O) bent
(C1) 109.5 degrees
approx. bond angle:
(C2) 120 degrees
(O) 109.5 degrees
polar
polar or nonpolar:
trigonal planar
molecular geometry:
H
O
Structure #2
electronic geometry: trigonal planar
O
O
C C
O
O
C
C
O
H
O
O
C C
O
O
O
P
O
2
O
O
C C
O
O
electronic geometry:
H
O
Structure #3
H Structure
electronic geometry: (P) tetrahedral
(O) tetrahedral
molecular geometry: (P) tetrahedral
trigonal planar
molecular geometry: trigonal planar
approx. bond angle:
120 degrees
polar or nonpolar?
nonpolar ionic
#4
(O) bent
approx. bond angle:
(P) 109.5 degrees
(O) 109.5 degrees
polar or nonpolar?
8
polar