Unit 2 Analytical techniques

Question 1

State two types of analytical techniques

Answer 1

Mass spec and Infra red spectroscopy

Question 2

What is the name of the process by which molecular ions are broken up into ions with smaller molecular mass

Answer 2

The process is called fragmentation

Question 3

what peak is at the far right of a mass spectrum

Answer 3

The molecular ion peak, if you add a hydrogen atom to the peak you will get the relative molecular mass of the original molecule

Question 4

what is the difference between low and high resolution mass spec

Answer 4

High resolution records the masses to a higher accuracy, by including more significant figures. Whereas, low resolution mass spectrometry records the mass to the nearest whole number

Question 5

Describe what happens in a infra-red spectrometer

Answer 5

A beam of infra-red light is passed through a sample, the radiation that emerges has some frequencies missing that correspond to the bonds found in the sample. A graph of transmittance against frequency is then plotted.

Question 6

Define the fingerprint region

Answer 6

The area on an infra-red spectrum between 500-1500cm-1 which contains a series of complex vibrations that is unique to each molecule.