Chapter 29

Question 1

TMS

Answer 1

Used as the standard reference chemical against which all chemical shifts are measured. TMS is given a chemical shift value of 0ppm.
(CH3)4Si

Question 2

stationary phase

Answer 2

The phase that does not moves in chromatography.

Question 3

mobile phase

Answer 3

The phase that moves in chromatography.

Question 4

adsorption

Answer 4

The process that occurs when a gas or liquid or solute is held to the surface of a solid.

Question 5

retention time

Answer 5

In gas chromatography, The time for a component to pass from the column inlet to the detector.

Question 6

Rf value

Answer 6

Rf = distance moved by a component/
distance moved by solvent

Question 7

spin-spin coupling

Answer 7

In an NMR spectrum, the interaction between spin states of non-equivalent nuclei that results in the splitting of a signal.

Question 8

chemical shift δ

Answer 8

A scale, in ppm, that compares the frequency of an NMR absorption with the frequency of the reference TMS at δ = 0 ppm.