Study Guides (261,044)
CA (126,168)
McMaster (7,841)
CHEM (201)
CHEM 2OA3 (10)
Study Guide

[CHEM 2OA3] - Midterm Exam Guide - Everything you need to know! (74 pages long)

by Kelsea Mann , Fall 2014
74 Pages

Course Code
Paul Harrison
Study Guide

This preview shows pages 1-3. Sign up to view the full 74 pages of the document.
Page: of

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
[CHEM 2OA3] Comprehensive Midterm Exam guide including any lecture notes, textbook notes and exam guides.find more resources at CHEM, chapter one 1-47 We can construct all compounds by combining atomic molecules, forming degenerate hybrid orbitals. All the bonds in this molecule has an antibonding MO Sigma bonds: low in energy, head-on overlap Sigma star: high in energy, complimentary Pi star: high in energy Strongest to weakest: Sigma, Pi, Pi star, Sigma star 1-48 Pi is weaker than sigma – if we start with an alkene, we destroy the pi bond during a reaction, but the sigma bond remains intact. Bond length: sigma bond between sp: s e closer to the nucleus. More s character: sp bond is shorter than an sp3 bond. 1-49 Bond length contracts as hybridization becomes more s in character Bond strength increases as the hybridization becomes more s in character Double bond is stronger than single bond 1-50 Valence shell electron pair repulsion (VSEPR) 1. Determine the steric number (number of substituents around the atom) Methane steric number: 4. Lone pairs count as steric numbers – it behaves as a substituent when finding steric number. When steric number is four, we need four orbitals (hybridize one s and 3 p in methane). When steric number is three, sp^2. When steric number is two, sp. 1-52 For any sp^3 hybridized atom, the 4 valence e pairs will form a tetrahedral e group geo Lone pairs repel bonded pairs more than bonded pairs repel bonded pairs. Number of lone pairs impacts the bond angles. 1-53 The geometry of ammonia: trigonal pyramidal. 1-54 BF3: six e species, strong lewis acid. Steric number of 3 – hybridization is sp2. Unlike ammonia, because there is no lone pair, there is a trigonal molecular geometry. 1-55 Boro▯ has a▯ u▯hy▯ridized p or▯ital, ▯ut it is e▯pty, so it does▯’t ▯ou▯t. It’s just a regio▯ of space where e could be if they wanted to. If we were to react BF3 with an e donor, the p orbital tells us where the e could go if we were to add them. 1-56 Lone pair, sigma bond to C on left, sigma to C on right, pi bond Sp^2 hybridized – one of the two sp^2 hybrids will accommodate the lone pair, the others will hang with C find more resources at
More Less
Unlock Document
Subscribers Only

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

Unlock Document
Subscribers Only
You're Reading a Preview

Unlock to view full version

Unlock Document
Subscribers Only

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.