100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary Modern Analytical Techniques I £3.49   Add to cart
Quickly navigate to
Preview
  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Chemistry 2015
  6.  
  7. Unit 7 - Modern Analytical Techniques I (9CH0)

Summary

Summary Modern Analytical Techniques I
 49 views  0 purchase

Detailed notes on Modern Analytical Techniques I. Notes written using Edexcel Chemistry textbooks, past papers and more. Written by a student with all A*s at GCSE, 3A* predictions at A Level and with an offer for Natural Sciences at Cambridge.

Preview 1 out of 3  pages

Document information

  • No
  • Modern analytical techniques i
  • March 30, 2020
  • 3
  • 2019/2020
  • Summary

Subjects

Connected book

book image

Book Title:

Author(s):

  • Edition:
  • ISBN:
  • Edition:

More summaries for

All for this textbook (12)

Written for

All documents for this subject (7)

Seller

avatar-seller
natland9

Reviews received

Content preview

Topic 7: Modern Analytical Techniques I
Topic 7A: Mass spectrometry
1. be able to use data from a mass spectrometer to:
Mass Spectrometry
Molecules are bombarded by high speed electrons in a mass spectrometer and an electron is
removed to form a molecular ion. The +1 charge deflects the molecule onto a detector and the
results can be shown on a graph.
- The x-axis is mass/charge ratio where charge is almost always 1 so effectively displays
the molecular mass
- The y-axis shows the abundance of the ions, often given as a percentage

Determine the relative molecular mass Mass spectrum of pentane
To find the relative molecular mass of the
compound, look at the peak furthest to the right
i.e. with the highest m/z ratio. This is called the
molecular ion peak and gives the weight of the
whole molecule. In organic compounds there may
be a small peak to the right of the molecular ion
peak caused by the C13 isotope.


Suggest possible structures of a simple organic compound from the m/z of the molecular ion
and fragmentation patterns.
The bombarding of electrons causes some of the molecules to break up into fragments. The
fragmentation patterns are displayed on the mass spectrum and can be used to identify the
molecule and its structure.

E.g. CH3CH2CH3+ → CH3CH2• + CH3+
propane molecular ion free radical ion



Common fragments:
15 – CH3+
17 – OH+
29 – C2H5+
43 – C3H7+
57 - C4H9+

Example: Work out the molecule that has produced this mass spectrum

- Mr is 72 as molecular ion peak is at 72
- Peak at 29 caused by C2H5+
- Peak at 43 caused by C3H7+
- Peak at 57 caused by C4H9+
 Must be pentane

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller natland9. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £3.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

62555 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£3.49
  • (0)
  Add to cart