Download color - MhChem.org

Page III-20a-1 / Exam I Review
Chemistry 222 Exam I Review
Chapters 7, 8 and 20
Midterm I
Chapters 7, 8 and 20
• Bring: calculator, pencil, scantron (50
questions / side, 100 questions total),
"Organic Chemistry" lab, Exam Prep I,
safety glasses and lab notebook (for lab)
• 25 multiple choice questions, four short
answer questions, ~2 hours in length
• Returned Friday with "summary sheet"
Good luck with your studying!
Let's start the review!
Chemistry 222
Professor Michael Russell
MAR
MAR
Which of the following is NOT a correct Lewis
dot structure?
A.
1.
B.
2.
N
N
N
3.C. H
O
4.D.
C
C
N
O
A.
C.
B.
D.
MAR
MAR
Determine the formal charges for the formate ion:
A. 0
B. +1
C.+1
D. 0
MAR
Which of the following is NOT a correct
Lewis dot structure?
0 0
–1 –1
0 –1
0 –1
Using VSEPR, which of the following
corresponds to the molecular shape
of SCl2?
A. linear
B. bent
C. “T-shaped"
D. trigonal pyramid
E. orthorhombic
MAR
Page III-20a-1 / Exam I Review
Page III-20a-2 / Exam I Review
Based on VSEPR, which of the following
corresponds to the molecular shape of the
IF2─ ion?
What is the approximate C-C-H angle in the
acetylene, C2H2, molecule?
A. linear
B. bent (bond angle 120˚)
C.“T-shaped”
D.bent (bond angle 109.5˚)
E. trigonal pyramid
A. 90˚
B. 120˚
C.109.5˚
D.180˚
E. -30˚
MAR
MAR
Which of the following groups of elements is
arranged correctly in order of increasing
electronegativity?
What is the carbon-oxygen bond order in
formaldehyde, CH2O?
A. Mg < P < N < F
B. Mg < N < P < F
C.N < Mg < P < F
D.F < P < Mg < N
A. 1
B. 2
C.1 ½
D.2 ½
E. -1
MAR
MAR
What is the average carbon-oxygen
bond order in the formate ion, HCO2–?
Given the bond dissociation enthalpies below, calculate the
standard molar enthalpy of formation of NF3:
½N2(g) + ³⁄2 F2(g) → NF3(g)
A. 1
B. 2
C.1 ½
D.2 ½
E. -1
MAR
Bond
Dissociation Enthalpy
(kJ/mol)
N≡N
946
F—F
159
N—F
272
A. 833 kJ/mol
B. -105 kJ/mol
C. 440. kJ/mol
D. -578 kJ/mol
E. -220. kJ/mol
MAR
Page III-20a-2 / Exam I Review
Page III-20a-3 / Exam I Review
Which of the bonds below is least polar?
A. B—O
B. B—N
C.B—F
D.B—C
E. AC-DC
Which of the following molecules is
polar?
A. BCl3
B. CO2
C.N2
D.ClF
MAR
MAR
Which of the following molecules is most
likely to have a dipole moment?
What hybrid orbital set is used by the
boron atom in the BCl4- ion?
A. CH4
A. sp
B.sp3
C.sp2
D.d2sp3
E.dsp3
B. SF6
C.BeF2
D.NF3
MAR
MAR
Cysteine is one of the natural amino acids.
Cysteine is one of the natural amino acids.
The molecule has
Estimate the values of the indicated angles:
A. 13 sigma (σ) bonds and 1 pi (π) bond
B. 14 sigma (σ) bonds and 1 pi (π) bond
C.20 sigma (σ) bonds and 1 pi (π) bond
D.12 sigma (σ) bonds and 1 pi (π) bond
A. Angle 1 = 180˚
B. Angle 1 = 109˚
C. Angle 1 = 109˚
D. Angle 1 = 180˚
MAR
MAR
Page III-20a-3 / Exam I Review
Angle 2 = 120˚ Angle 3 = 109˚
Angle 2 = 120˚ Angle 3 = 109˚
Angle 2 = 109˚ Angle 3 = 109˚
Angle 2 = 90˚ Angle 3 = 90˚
Page III-20a-4 / Exam I Review
Nitrogen can lose an electron to form N2+.
What is the bond order of N2+?
A. 1
B. 1.5
C.2
D.2.5
E. 3
MAR
Is N2+ diamagnetic or paramagnetic?
A. diamagnetic
B. paramagnetic
C.42
MAR
What is the bond order of the superoxide ion, O2–?
A. 1
B. 1.5
C. 2
D. 2.5
E. 3
What is the systematic name for this
alkane?
A. nonane
B. 2-ethyl-5-methylhexane
C. 2,5-dimethylheptane
D. 2,3-dimethyloctane
MAR
MAR
This compound:
Given the following compounds:
1. C2H4
2. C5H10
3. C14H30
4. C7H8
Which one(s) could be an alkane?
A. The compound is an isomer of pentane and is
named 2,3-dimethylbutane.
B. The compound is an isomer of octane and is named
2,2-dimethylbutane.
C. The compound is an isomer of hexane and is named
2,2-dimethylbutane.
D. The compound is an isomer of hexane and is named
3,3-dimethylbutane.
MAR
A. only 1
B. only 2
C.only 3
D.3 and 4
E. none of the above
MAR
Page III-20a-4 / Exam I Review
Page III-20a-5 / Exam I Review
What is the name of the molecule?
A. butanoic acid
B. butanal
C. butanol
D. 2-butanol
E. methyl ethyl ketone
MAR
What is the name of the molecule?
A. butanoic acid
B. pentanal
C. pentanoic acid
D. pentanone
E. pentanol
MAR
What is the name of the molecule?
A. butanoic acid
B. butanal
C.butanol
D.2-butanol
E. butanone
MAR
End of
Review good luck
with your
studying!
Need more practice?
• Practice Problem Sets (online)
• Concept Guides (Companion and online)
• Chapter Guides (online)
• End of Chapter Problems in Textbook (every
other question has answer at end)
Good luck with your studying!
MAR
Page III-20a-5 / Exam I Review