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Exam 3 Organic Chem- Chapter 12

front 1

What is Mass Spectrometry (MS)?

back 1

This technique measures the mass and molecular weight of a molecule.

front 2

How do you gain structural information?

back 2

By measuring the masses of fragments produced when molecules break apart

front 3

What are the three basic parts of spectrometers?

back 3

Ionization source

Mass Analyzer

Detector

front 4

Ionization Source is what?

back 4

sample molecules are given an electrical charge

front 5

Mass analyzer is what?

back 5

ions are separated by their mass-to-charge ratio,

front 6

What is a detector?

back 6

the separated ions are observed and counted.

front 7

What is the most common spectrometer used?

back 7

The electron-impact, magnetic-sector instrument

front 8

What causes a cation radical?

back 8

A high energy electron strike

front 9

What is a cation radical?

back 9

A species with a positive charge and unpaired electrons

front 10

What is the base peak?

back 10

The tallest peak which is assigned to 100% intensity

front 11

What is the Parent peak?

back 11

The peak that corresponds to the unfragmented cation radical

front 12

What is often not the base peak?

back 12

The molecular ion

front 13

What are mass measurements taken from?

back 13

Specific isotopic compositions rather than the periodic table.

front 14

How does fragmentation occur?

back 14

when the high-energy cation radical flies apart by spontaneous cleavage of a chemical bond.

front 15

What is formed during fragmentation?

back 15

a relatively stable carbocation