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CHEM 219 MODULE 8 ORGANIC CHEMISTRY QUESTIONS WITH ANSWERS 100% CORRECT
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CHEM 219 MODULE 8 ORGANIC CHEMISTRY QUESTIONS WITH ANSWERS 100% CORRECT
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Name: Score:113 Multiple choice questions
Definition 1 of 113
biggest causative agent of the exact sequence in copolymer chains:
mixture of two different homopolymers
relative reactivity of the monomers present
molecular mass of polymers
propagation of free radicals
Definition 2 of 113
One radical abstracts a hydrogen atom from another radical species which forms a new
covalent bond and makes and alkane- then an alkene is formed by the combination of
unpaired electrons on adjacent carbons
anionic addition polymerization propagation
radical coupling
chain transfer reaction
radical disproportionation
Definition 3 of 113
a polymer made up of one type of repeating unit. It is made from one monomer only.
Homopolymer
Graft Copolymer
Ligands
Graft Sequence
,Definition 4 of 113
large molecule made by repetitive linking of smaller units (monomers)
Macromolecule
Monomer
Polymer
Thermoplastic
Definition 5 of 113
The defining characteristic of step-growth polymers
The final polymer chain does NOT include all the atoms initially present in the monomer
molecules
made by addition of one monomer unit to another in a repetitive pattern
1. Initiation
2. Propagation
3. Termination
1. the monomer used
2. the molecular weight of the final polymer chain
,Definition 6 of 113
chain-growth
polymer: polyvinylidenedichloride
monomer: H2C=CCl2
cling-wrap
Saran
Sulfar
Teflon
Orlon
Definition 7 of 113
3 main characteristics of free-radicals
1. electrically neutral
2. quite reactive and reacts quickly to pair up the lone electron
3. formed from radical initiators
1. number of substituents present
2. type of substituents present
stops the chain growth, involves 2 radical species- pairing of 2 unpaired electrons and
formation of new covalent bond
made by addition of one monomer unit to another in a repetitive pattern
, Definition 8 of 113
chain grows by 1 anionic intermediate adding to the C=C bond of a monomer molecule
monomer anion adds in place of a Grignard Reagent or Alkyllithium reagent
-each addition grows by one unit
cation addition polymerization termination
radical disproportionation
radical disproportionation
anionic addition polymerization propagation
Definition 9 of 113
What happens during propagation of free-radical polymerization?
The final polymer chain does NOT include all the atoms initially present in the monomer
molecules
Reduce crystallinity (interfere with the formation of crystals)
a new chiral center is formed at every position where the substituent branches from the
back bone of the chain
produces a new radical that can continue the polymerization chain reaction:
Each attack of the radical with a new monomer unit extends the chain by one unit
Definition 10 of 113
situation creates what copolymer?
polymerization of monomer A is iniated, then B is added, then A is added, etc
-particularly useful for anionic polymerization bc the living end (anion) stays active until the
reaction is quenched.
Cascade sequence
Block sequence
Stagger sequence
Box sequence
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