test 2

Question 1

reduction potential

Answer 1

the more positive the reduction potential the more powerful the oxidant

Question 2

galvanic cell

Answer 2

spontaneous, generates a voltage, the potential is always positive

Question 3

daniel cell

Answer 3

type of galvanic cell

Question 4

anode in galvanic cell

Answer 4

source of electrons connected with a wire

Question 5

oxidation occurs at

Answer 5

the anode

Question 6

reducation occurs at

Answer 6

the cathode

Question 7

difference between galvanic and electrolytic cell

Answer 7

galvanic creates its own energy, electrolytic needs a power supply(battery pulls electrons)

Question 8

potential of a standard hydrogen electrode

Answer 8

0V

Question 9

Calomel electrode

Answer 9

saturated with KCl and the potential is 0.241

Question 10

Silver-silver chloride electrode (AgCl)

Answer 10

saturated with KCl and the potential of the electrode is 0.197 V

Question 11

Electrochemical Techniques

Answer 11

polarography, amperometry, chronoamperometry. cyclic voltammetry. differential pulse voltammetry, impedance spectroscopy

Question 12

potential waveform

Answer 12

the potential applied to the working electrode is a triangular waveform

Question 13

cyclic voltammetry typical standards

Answer 13

peak potential=59.2 mV, peak width=29.6 mV, peak current =1 for all scan rates, peak current increases linearly

Question 14

diffusion layer

Answer 14

build up of ions around the electrode beans that the ions in the bulk are sheilded from the electrode

Question 15

thinner diffusion layer

Answer 15

greater current

Question 16

faster scan rate

Answer 16

thinner the diffusion layer

Question 17

as reduction peak increases

Answer 17

the potential should not change

Question 18

thermoset polymers

Answer 18

have crosslinks, will not flow when heated, ex. phenolic and epoxy resins

Question 19

more negative reduction potential

Answer 19

easier oxidation, more powerful reductant

Question 21

thermoplastic

Answer 21

polymers that soften, take new shapes without chemical changes, linear and branched structure, their chains interact with one another

Question 22

homopolymer

Answer 22

chains of many repeating monomer units

Question 23

copolymer

Answer 23

chains of different repeating monomer units

Question 24

number average molar mass (Mn)

Answer 24

sum of mw and number

Question 25

mass average molecular weight (Mw)

Answer 25

1/ sum of mw and number

Question 26

heterogeneity index

Answer 26

Mw/Mn

Question 27

step growth polymerization

Answer 27

monomers with at least two reactive functional groups react together in a stepwise manner, forming increasingly larger chains until a polymer is formed

Question 28

chain polymerization

Answer 28

polymer growth takes place by monomer reacting only with the reactive centers, polymerization ceases when the active center is destroyed by termination reactions