Cyclic Voltammetry a technique for
studying electrochemical reactions
Current is measured as potential is scanned from one
value to another; then reversed.
Change is rapid so products do not have time to diffuse
away from the electrode
If swept negative,
kinetics of methanolysis of diethylacetal
For a simple reaction A B, the rate d[A]/dt = -k[A]
d[A]/dt is the rate of change of the concentration of A
k is the rate constant. Do not confuse the two.
The rate of formation of product B
Note for both TGA and DSC, results are better if samples
(not polymers) are finely ground.
Scan rates suggested are reasonable compromises between
quality of results and time required; you can change them.
TGA sample crucibles they are ex
Excitation of a vibration in a molecule may give
the excited state in several rotational states.
These may be resolved for gaseous molecules if
the resolution is high enough. Energies depend
on masses and bond lengths, permitting
X-rays from tube or radioactive source excite electrons in sample. Excited
atoms emit x-rays of characteristic energies
K lines come from a
vacancy in the 1s
level (K shell) filled
by an electron from
the L shell (K) or M