New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Exam 1 study guide

by: Rachel Taylor

Exam 1 study guide Chem 372

Rachel Taylor
GPA 3.5

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

This covers MS, IR and NMR spectroscopy and prepares for the first exam.
Organic Chemistry
Dr. Friebe
Study Guide
Chemistry, Organic Chemistry
50 ?




Popular in Organic Chemistry

Popular in Chemistry

This 4 page Study Guide was uploaded by Rachel Taylor on Thursday January 28, 2016. The Study Guide belongs to Chem 372 at Eastern Michigan University taught by Dr. Friebe in Winter 2016. Since its upload, it has received 57 views. For similar materials see Organic Chemistry in Chemistry at Eastern Michigan University.


Reviews for Exam 1 study guide


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 01/28/16
Organic Chemistry 2 Study guide Exam 1: NMR, IR, and Mass Spectroscopy Directions: The questions listed below cover the most important concepts of MS, IR, and NMR spectroscopy. Make sure that you attempt to find the answer in your book or online before looking at the answer key at the bottom. Also, to get the most out of this, make sure you can do more than just regurgitate the answer, but can explain the reasoning behind it. Ultimately you will need to combine the information from all three spectrums to come to the correct structural formula of a molecule, so make sure to practice reading the spectrums in the back of your book. 1. Why do we use Mass spectrometry? 2. What do the peaks represent? How are they formed? 3. What is the M peak? What is the M+1 peak? 4. What would the ratios of the M peak and the M+2 peak represent? 5. What is the X-axis on a Mass Spectrum? How does it relate to the peaks? 6. What is the Y-axis on a Mass Spectrum? Why is the Base Peak the tallest peak? 7. What is high resolution mass spectrometry? Why do we use it? 8. Why do we use the IR Spectrum? 9. Where is the fingerprint region? 10. What is IR Spectrometry measuring? 11. Why do we use NMR spectroscopy? 12. What does NMR spectroscopy measure? 13. What does peak intensity represent on an NMR spectrum? 13 14. In C NMR spectrometry, why can’t we use carbon 12 (the most common isotope)? 15. What is the peak at 0 ppm? 16. What are enantiotopic protons? Diastereotopic protons? 17. What does it mean for a proton to be shielded? Does shielding shift a proton upfield or downfield? 18. When does deshielding occur? 19. How many sigma bonds away can a proton be from another proton for spin-spin splitting to occur? Answers: 1. We use mass spectrometry to determine the molecular formula of a molecule 2. They represent molecule fragments. They are formed by blasting the molecule with high energy electrons so they form carbocations and radicals and break apart. 3. The M peak represents the molecular ion. The M+1 peak represents the carbon-13 molecular ion. 4. It represents common isotopes and their relative abundance. When it is in a 1:3 ratio, Chlorine is present. If it is in a 1:1 ratio, bromine is present. 5. The X-axis is the molecular ion. It is equal to the molecular weight because electron mass is negligible. 6. The Y-axis is the relative abundance of the molecular ions. The base peak is the tallest because it is the most abundant ion (most likely because it is the most stable molecular ion). 7. High resolution Mass Spectrometry measures exact masses to up to the fourth decimal so they can determine the molecule from others with similar masses. 8. To determine the functional groups. 9. Between 1500 and 400 cm . -1 10. The bending and flexing of bonds. 11. We use NMR spectroscopy to find the structure of a molecule. 12. NMR Spectroscopy measures the magnetic field around atoms. The magnetic field is created by nuclear flips. 13. Peak intensity measures the relative abundance of the absorbing molecule. 14. Only atoms with odd mass numbers show up on the NMR spectrum. 15. The TMS reference. It is a highly shielded molecule with a Si surrounded by 4 CH gro3ps. 16. Enantiotopic protons are two equivalent protons that are on the same carbon that has two different groups on it. Diastereotopic protons are two non-equivalent protons that are attached to the same carbon that is bonded to a molecule with a stereogenic center. 17. A proton is shielded when it has a higher electron density around it shifting it upfield. 18. Deshielding occurs when electronegative atoms, double bonds, or benzene rings pull the electron density away from the proton shifting it downfield.


Buy Material

Are you sure you want to buy this material for

50 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Kyle Maynard Purdue

"When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the I made $280 on my first study guide!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.