CH 222 WINTER 2011 - FIRST MIDTERM EXAM
Form No. 3
This exam has 22 questions worth 5 pts each, plus one question worth 2 pts.
The total possible score is 112 pts.
DO NOT OPEN THIS EXAM UNTIL TOLD TO DO SO
Before the exam begins you can do the following on the Scantron answer sheet. Use a #2 pencil.
1.
Fill in your name (LAST NAME, FIRST NAME) in the large box on the left. Don't forget
to bubble in the circles below your name.
2.
Fill in your student ID number in the box labeled "IDENTIFICATION NUMBER". Do not
use dashes or blank spaces. Fill in the circles as well.
3.
In the box labeled "CLASS SECTION NUMBER", enter the appropriate number
8 am class = section 001 (Nafshun)
11am class = section 003 (Watson)
4.
9 am class = section 002 (Nafshun)
12pm class = section 050 (Muir)
In the lower right corner, in the box labeled "FORM NUMBER", write in the exam form
number (1, 2, 3, 4 etc.) given above in the shaded box and fill in the bubble.
ONLY ONE APPROVED NOTECARD IS ALLOWED
ALL PHONES AND OTHER ELECTRONIC DEVICES
OTHER THAN CALCULATORS MUST BE OFF
You may keep this exam packet and your notecard when the exam period is
complete.
Hand in the Scantron answer sheet to a TA at the end of the exam.
Periodic Table
Geometry Handout
1.
Place the following in order of decreasing dipole moment.
I. cis-CHCl=CHCl
(A)
(B)
(C)
(D)
(E)
2.
III. cis-CHF=CHF
III > I > II
II > I > III
I > III > II
II > III > I
I = III > II
Describe a pi bond.
(A)
(B)
(C)
(D)
(E)
3.
II. trans-CHCl=CHCI
side by side overlap of p orbitals
end to end overlap of p orbitals
s orbital overlapping with the end of a p orbital
overlap of two s orbitals
p orbital overlapping with a d orbital
List the number of sigma bonds and pi bonds in a triple bond.
(A)
(B)
(C)
(D)
(E)
1 sigma, 1 pi
2 sigma, 1 pi
2 sigma, 2 pi
1 sigma, 2 pi
0 sigma, 3 pi
4.
Consider the molecule below. Determine the molecular geometry at each of the 2 labeled
carbons.
(A)
(B)
(C)
(D)
(E)
5.
6.
C1 = tetrahedral, C2 = linear
C1 = trigonal planar, C2= bent
C1 = bent, C2 = trigonal planar
C1 = trigonal planar, C2 = tetrahedral
C1 = trigonal pyramidal, C2 = see-saw
Which of the following statements is TRUE?
(A)
The total number of molecular orbitals formed doesn't always equal the number of atomic
orbitals in the set.
(B)
A bond order of 0 represents a stable chemical bond.
(C)
When two atomic orbitals come together to form two molecular orbitals, one
molecular orbital will be lower in energy than the two separate atomic orbitals and
one molecular orbital will be higher in energy than the separate atomic orbitals.
(D)
Electrons placed in antibonding orbitals stabilize the ion/molecule.
(E)
All of the above are true.
The O-C-O bond angle in the carbonate ion, CO32-, is:
(A)
(B)
(C)
(D)
(E)
90
120
109.5
A little greater than 109.5
A little less than 109.5
7.
The H-O-H bond angle in water, H2O, is:
(A)
(B)
(C)
(D)
(E)
8.
The molecular geometry of CF4 is:
(A)
(B)
(C)
(D)
(E)
9.
180
120
109.5
A little greater than 109.5
A little less than 109.5
bent
trigonal planar
trigonal pyramidal
tetrahedral
octahedral
Consider CH4, CF4, CCl4, and NH3. Which of the following statements is correct?
(A)
(B)
(C)
(D)
(E)
None of these molecules is polar
One of these molecules is polar
Two of these molecules are polar
Three of these molecules are polar
All four of these molecules are polar
10.
Consider the molecule below and identify the correct statement.
H
H
C
H
H
C
C
H
C
C C
C
H
C
C
H
C
H
11.
H
There are two carbons that have sp2 hybridization schemes
There are three carbons that have sp2 hybridization schemes
There are four carbons that have sp2 hybridization schemes
There are five carbons that have sp2 hybridization schemes
There are six carbons that have sp2 hybridization schemes
Consider MO (Molecular Orbital Theory). The F2 molecule is:
(A)
(B)
(C)
(D)
(E)
12.
H
C C
H
(A)
(B)
(C)
(D)
(E)
H
diamagnetic
paramagnetic
metamagnetic
Beyoncé-magnetic
Sixx-magnetic
Molecular orbital theory predicts the O2- ion (a minus one charge) has a bond order of:
(A)
(B)
(C)
(D)
(E)
1.0
1.5
2.0
2.5
3.0
13.
Consider MO (Molecular Orbital Theory). The N2+ (a positive one charge) ion is:
(A)
(B)
(C)
(D)
(E)
paramagnetic
diamagnetic
tetramagnetic
pentamagnetic
polarmagnetic
14.
Write the nuclear equation for the alpha decay of 226 Ra .
88
4
226
230
(A)
Ra + 2 He →
Th
88
90
226 Ra → 1 n + 225 Ra
(B)
0
88
88
226 Ra → 0 e + 226 Ac
(C)
-1
88
89
226 Ra + 0 e → 226 Ac
(D)
1
88
89
4
226
222
(E)
Ra → 2 He +
Rn
88
86
15.
Determine the identity of the daughter nuclide from the beta decay of 32 P .
15
33 P
(A)
15
32 S
(B)
16
33S
(C)
16
32 Si
(D)
14
28 Al
(E)
13
16.
The following reaction represents what nuclear process?
2 H + 2 H → 3 He + 1 n
0
1
1
2
(A)
(B)
(C)
(D)
(E)
17.
Determine the binding energy of an O-16 nucleus. The O-16 nucleus has a mass of 15.9905
amu. A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665 amu, and 1 amu is
equivalent to 931 MeV of energy.
(A)
(B)
(C)
(D)
(E)
18.
nuclear fusion
alpha emission
beta emission
nuclear fission
neutron capture
8.84 MeV
128 MeV
138 MeV
78.1 MeV
38.2 MeV
When an alpha particle is emitted,
(A)
(B)
(C)
(D)
(E)
1 proton is converted into 1 neutron
2 protons and 2 neutrons are ejected from the parent nuclide
2 electrons and 2 protons are ejected from the parent nuclide
1 electron and 1 proton are combined to form 1 neutron
2 positrons and 2 neutrons are ejected from the parent nuclide
19.
Consider the valley of stability. What decay is expected for a species located in the extreme top
right of the belt?
(A)
(B)
(C)
(D)
(E)
20.
A radioactive decay series that begins with 238U ends with formation of the stable nuclide 206Pb.
How many alpha particle emissions and how many beta particle emissions are involved in the
sequence of radioactive decays?
(A)
(B)
(C)
(D)
(E)
21.
Alpha decay
Beta decay
Gamma decay
Electron decay
Tooth decay
6 alpha and 8 beta decays
6 alpha and 6 beta decays
8 alpha and 8 beta decays
8 alpha and 6 beta decays
8 alpha and 2 beta decays
A student obtains a sample of 59Fe (t1/2 = 44.5 days) containing 0.505 g. How many grams of
59
Fe will remain after 365 days?
(A)
(B)
(C)
(D)
(E)
583 g
6.37 g
0.00210 g
0.00172 g
0.00154 g
22.
Which of the following correctly depicts the curve of nuclear binding energy?
23.
So, Exam 1 is over. And now…
(A)
(B)
(C)
(D)
(E)
I’m goin’ Party like it’s 1999.
Vegas.
Downtown with friends.
Refurnish my room to resemble Gilbert 224. I plan on reliving general chemistry every
day of my life; for it has been a breathtaking experience I cannot live without.
I need to write a letter to decline the Nobel Prize Committee's offer because the cash
prize will place me in a higher tax bracket.
[Any response will receive full credit; even no response.]