Show:
IR Spectroscopy
H-1 NMR Spectroscopy
C-13 NMR Spectroscopy
Mass Spectrometry
Pot luck
100

Absorption of IR radiation causes what to happen to bonds?

Stretch and vibrate
100
What does NMR stand for?
Nuclear Magnetic Resonance
100
What units are used to describe chemical shifts in NMR spectroscopy?
ppm
100

What does m/z stand for?

mass/charge ratio

100
What is another name for H-1 NMR?
proton NMR
200
What region of the IR spectrum is unique to every compound?
Fingerprint region
200
NMR spectroscopy uses electromagnetic radiation in what frequency range?
radio
200
What is the name of the reference compound used in NMR spectroscopy?
TMS (tetramethylsilane)
200
Why do so many different peaks appear on a mass spectrum from the analysis of a single compound?
ionisation causes fragmentation of the compound, resulting in fragment ions of various masses
200

What type of atoms have 'spin'?

atoms containing a nucleus that has an odd number mass number

300

What term describes the values represented on the x axis of an IR spectrum?

Wavenumbers

300
A triplet splitting pattern indicates how many neighbouring hydrogens?
2
300

What information does the number of peaks in C-13 NMR spectra tell us?

The number of different carbon environments

300
Which peak on a mass spectrum is referred to as the base peak?
The one showing the highest intensity/abundance
300
What effect does symmetry have on the number of different hydrogen or carbon environments in a molecule?
Symmetrical molecules have fewer different hydrogen and carbon environments
400
The fingerprint region of the IR spectrum includes bands that fall within what range of frequencies?
500 - 1400 cm-1
400
What information does peak area tell us about a compound?
The proportion of hydrogen atoms in each environment
400
How many peaks would appear on a spectrum produced from C-13 NMR spectroscopy of ethyl ethanoate
4
400
What useful information can be gained by observing the position of the molecular ion peak?
relative molecular mass
400
Which of these techniques (IR spectroscopy, H-1 NMR spectroscopy, C-13 NMR spectroscopy or mass spectrometry) does not use electromagnetic radiation?
mass spectrometry
500
What characteristic bond causes an absorbance band at 1670 - 1750 cm-1
C=O
500
How many hydrogen environments are present in butanone?
3
500

If a molecule has 6 carbons but the C-NMR only shows 5 peaks, how many equivalent carbon environments are there?

2

500

Write the fragment caused by a peak shown at 15 m/z. 

[CH3]+
500

Explain how spectroscopy could be used to differentiate between propan-1-ol and propan-2-ol

either 13C NMR or 1H NMR could be used to show different numbers of C and H environments. Propan-1-ol has 4 H environments and 3 C environments whereas propan-2-ol has only 3 C environment and 1 H environment