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Chirality
What is a synonym of stereoisomer?
How many structural units in a tetrad?
Chirality
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Answers
1
How many structural units in a
tetrad
?
4
5
6 or 7
1
2
What is a synonym of
stereoisomer
?
Spacial isomer
Rotamer
Constitutional isomer
Conformer
3
What is a
diad
?
tetrad
2 adjacent structural units along length of polymer backbone
Rheological closure
triad
4
What do 2
isomers
share in common?
Configuration
proton chemical shift values
Chemical formula & MW
Conformation
5
What is
tact
?
Tacticity
Skill &sensitivity in dealing with others & difficult issues
The art of making a point without making an enemy
Perception, sensitivity, diplomacy & poise
6
What does
atactic
mean?
Random chiral orientations along polymer chain
Isotactic
Mix of head-to-head & head-to-tail units
Syndiotactic
7
How many structural units in a
pentad
?
7
8
6
5
8
What is a
triad
?
2 diads sharing common intermediate structural unit
6 structural units in a series
4 structural units in a series
5 structural units in a series
9
What does
meso
mean?
Identically oriented
located on opposite side of extended chain
10
What is
z-average molecular weight
?
∑NiMi2 /∑NiMi
∑WiMi / ∑Wi
∑WiMi2 / ∑WiMi
3rd moment of MW values divided by 2nd moment of MW values
11
What is
degree of polymerization
?
The number of monomer units in a polymer chain
Ph.D.
M.S.
12
Which type of a
triad
is this?
Isotactic
Syndiotactic
Heterotactic
rm triad
13
What does
racemic
mean?
congruence
Units oriented in opposition
14
Why is it important to understand
tacticity
?
Predict glass transition T
Understand polymer conformations
IUPAC trivia
Predict melting, solubility & rheology
15
What is distinct about a given
structural isomer
?
Constituent atoms bonded together in distinct arrangement
Dihedral angle fixed for the structural isomer
16
This
polysiloxane segment
is of which tacticity?
Syndiotactic
Isotactic
