Chemistry 125a

Freshman Organic Chemistry

Fall 2002


2002 First Semester Final Exam (pdf 164kB)

Answer Key (pdf 192kB)

First Semester Final Exam : 9-12AM Tuesday, December 17, Room 220 Dunham Lab

Review Session with Prof. McBride, Sunday, December 15, 7-9 PM, 116 WLH

1999 First Semester Final Exam (pdf 128kB) and Answer Key (pdf 68kB)

2000 First Semester Final Exam (pdf 180kB) and Answer Key (pdf 48kB)

2001 First Semester Final Exam (pdf 180kB) and Answer Key (pdf 220kB)
Supplemental information for above:
Resonance Structures
ProtonatedMeOHLUMO

"Disorder" and Entropy

13-Atom Trajectory

Potential Energy Surface : Overview on Equilibrium and Kinetics

Boltzmann Factor

Lecture Slides on Thermodynamics
December 2-4, 2002 (Powerpoint 2.2 MB)

Stereotopicity

Stereochemical Nomenclature: Cahn-Ingold-Prelog

Stereo Viewing

Thalidomide/Ritalin Chiral Switch
(note PROBLEMS at end of page)

van't Hoff's Tetrahedral Carbon (configuration) (1875)

Kolbe's Criticism of van't Hoff (1877)

Fischer on Models and the Fischer Projection (1891)

Answer Key to Exam 3 (pdf)

Exam 3 (pdf)

Previous 3rd Hour Exams

("Not Questions" would not be on the exam this year either because we have already tested the material or have not quite yet gotten to it)

2001 questions (pdf) (Word)
(Not Question 3)
2001 answers (pdf) (Word)
2000 questions (pdf) (Word)
(Not Questions 1,2,5)
2000 answers (pdf) (Word)
1999 questions (pdf) (Word)
(Not Question 6)
sorry, answer key unavailable
1998 questions (pdf) (Word)
(Not Questions 2, 10, 11, parts c&d of 6,
nor Bijvoet, Pasteur, van't Hoff, and Fischer in 8)
1998 answers (pdf) (Word)


Sample Mac files for Chem 3D.
Clicking below should automatically download the corresponding .hqx file and unstuff it (using Stuffit Expander)

Don't feel compelled to look at all of them.
You may learn more by making up your own molecules

antiButane
Cyclopentane Minimized
Cyclopentane Planar
Cyclohexane Minimized
Idealized Boat Cyclohexane
Twist-Boat Cyclohexane Minimized
Methylcyclohexane Minimized
Axial Isopropyls on Cyclohexane
Equatorial Isopropyls on Cyclohexane

Cyclopropane Minimized

Sample PC files for Chem 3D.
(To save one of these files onto your computer, right-click on it and choose 'Save target as')

Don't feel compelled to look at all of them.
You may learn more by making up your own molecules

AntiButane.c3d
cyclopentanemin.c3d
cyclopentaneplanar.c3d
cyclohexanemin.c3d
boat.c3d
twistboatmin.c3d
methylcyclohexanemin.c3d
axialisopropyls.c3d
isopropylequatorial.c3d

cyclopropanemin.c3d


Note: the topics with three red stars *** will NOT be on Wednesday's Exam

You can get an almost perfect grade knowing nothing more than was presented in class or was explicitly assigned (as for example the Chem3D problem set).

Energies: Choice of Zero and Chupka's Heat of Atomization of Carbon

Chem 3D homework (due Monday, Nov. 11)
Strain Energy in Butane
Non-Spherical Bromine
Textbook: Nomenclature in Ch. 3 (3.5-3.6), Conformation Ch. 5, part of Ch. 6 (6.4-6.5)

 

1869-1880 Configuration
"Arrangement of Atoms in Space"

Paternò's Tetrahedral Carbons (1869)
Lieben to Paternò on Atoms in Space (1869)
Koerner Proves 6-fold Symmetry of Benzene (1869)
*** van't Hoff's Tetrahedral Carbon (configuration) (1875)
*** Kolbe's Criticism of van't Hoff (1877)

1885- Conformation
"Strain"

Baeyer Proposes Strain Theory (1885)
Sachse Identifies Conformational Isomers; Baeyer objects (1890-93)
*** Fischer on Models and the Fischer Projection (1891)
Mohr Vindicates Sachse (1918)

Lecture Slides 11/04/02 (PowerPoint 100kB)

Lecture Slides 11/01/02 (PowerPoint 0.6MB)

1858-1860s Constitution
"Nature and Sequence of Bonds"

Couper On a New Chemical Theory (1858)
Kekulé on the Superiority of his Sausage Formulae (1865)
Other Molecular Diagrams and Models (mid 1860s)
Cannizzaro on Models (1872)

 

Lecture Slides 10/30/02 (PowerPoint 1.6MB)

Lecture Slides 10/28/02 (PowerPoint 1.6MB)

1828-1851 Isomerism
Radical (Dualistic) vs. Type (Unitary, Substitution) Theory

 Wöhler/Berzelius Letters about Urea (1828)
Wöhler's Urea Paper (analysis and isomerism preview) (1828)
Berzelius Coins the Term Isomeric (1830)
Wöhler/Berzelius on Liebig, Isomerism, & Organic Chemistry (1830-35)
Wöhler/Liebig Discovery of Benzoyl Radical (by analysis) (1832)
Dumas's Panegyric on the Radical Theory (1837)
Simple Alkane Etymology
Wöhler's Spoof of the Type Theory (1840)
Competing Views of Organic Chemistry (~1851)

Lecture Slides 10/25/02 (PowerPoint 676KB)

Answer Key for 2nd Hour Exam (PDF)

History Index

Why we study chemical history
Prerevolutionary contributions - Scheele

Lavoisier & the Chemical Revolution: Analysis
(Questions for Monday, Oct. 28, indicated by *)
Portrait (note the problem re. Fig. 10)
Preface (1789)
Elements & Oxidation *2
How to determine Gas Density
Calorimeter *4
Combustion of Phosphorus and Carbon *4
Quantitative Chemical "Formulae" *4

Improving Lab Equipment

Combustion Analysis Lavoisier/Prout/Liebig/Dumas (1788-1841)
Liebig's Kaliapparat and the etymology of K and Na (1831)
*** Distillation and the "Liebig" Condenser (1771)


 

Under Construction throughout the year.

Visitors who want to see last year's final web site should click here

 


Goals of Chem 125
 

Syllabus and Course Mechanics


 

Help Available from Chem 125 Alum Volunteers (available only from IP addresses in Yale domain)

Advice from Alumni


The first subject of the course is how we know about the existence of atoms, molecules, bonds and the role of authority in science. To begin we will contrast two erroneous treatments of atomic and molecular structure at the turn of the last century. One of them is by two great scientists G. N. Lewis (Lewis dot structures) and J. J. Thomson (discoverer of the electron). The other is by "clairvoyant" frauds.

You may enjoy reading some of the web material in preparation for the lectures:

What's Wrong with Lewis Structures

Seeing Atoms with the Mind's Eye

Lecture Slides 9/4/02 (PowerPoint)

Lecture Slides 9/6/02 (PowerPoint)

Lecture Slides 9/9/02 (PowerPoint)

Sample questions on Early Topics (pdf file)

read SPM web page and begin X-Ray Diffraction

Diffraction examples from lecture demonstration

Leslie Leiserowitz on his Triene (Transcript 16K)
Leiserowitz Quicktime Movie (160 x 120, 5.6 Meg) or (240 x 180, 10.3 Meg)

Jack Dunitz on the C-F Difference Density (Transcript 12K)
Dunitz Quicktime Movie (160 x 120, 6.2 MB) or (240 x 180, 11.2 MB)

Quantum Mechanics

Erwin Meets Goldilocks (problem set)

Quantum Mechanics II-V (thru 1-electron atoms)

Sample questions for first hour exam

Last Year's First Exam (PDF)

Answer Key for Last Year's First Exam (PDF 772K)

Lecture Slides 9/20/02 (PowerPoint)

Sample Questions on Functional Group Nomenclature (PDF)

Sample Quantum Mechanics Questions (PDF)

First Hour Exam (PDF)

Answer Key for First Hour Exam (PDF)


Quantum Mechanics VI-IX

Hybridization Animation

Energy Scales and Correlation Energy

H-H Bonding

C-C Overlap and Hybridization

Overlap / E-Match / Tunneling

XH3 (contact with reality)

Quantum Mechanics VI-IX

Viewing Orbitals with MacSpartanPlus

MO Interactions (HOMO/LUMO)

Functional Groups

Orbitals of:

HF an acid (substitution at H)
CH3F substitution at C (an acid)
O=CH2 the carbonyl group (an acid)

LUMO Analogies (elimination from C2H5X)

Where should R2C=O be attacked? (Bürgi-Dunitz Angle)

3-Center "Electron-Deficient" "Y" Bonds
[Textbook pp. 161-163, also B2H6 & (CH3Li)4 • OMe2]

Intramolecular HOMO/LUMO mixing and "Resonance"

2nd Hour Exam 2000 (Word)
Answers to 2000 2nd Exam
2nd Hour Exam 1999 (web page, answers at end)
2nd Hour Exam from 1998 (Word; ignore History Questions)
Answers to 1998 2nd Exam

10/23/01 Revised Answer Key to 2nd Hour Exam (PDF) ... (or as a Microsoft Word file)

OMO-OMO Mixing Problem


History Index

Energy and Maxwell Distribution

Heat of Carbon Atoms

Chem 3D homework

Strain Energy in Butane

Stereochemical Nomenclature: Cahn-Ingold-Prelog

Stereo Viewing

Thalidomide/Ritalin Chiral Switch

Stereotopicity

Custodians of Stereoviewers

Overview on Equilibrium and Kinetics

13-Atom Trajectory

Potential Energy Surface

Boltzmann Factor

Free Radicals and Rate Determining Step

 


Comments? j.mcbride@yale.edu

copyright 2001 J. M. McBride