OCHEM 2 LAB FINAL UTA QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Polymers Ans✓✓✓Class of molecules that consist of repeating
structural units called monomers
Homopolymers Ans✓✓✓Polymers that consist of a single repeating
monomer (M)
R-M-(M)n-M-R
Copolymers Ans✓✓✓Polymers consisting of two distinct monomeric
units, M1 and M2, distributed at random in the polymer
R-M1-(M1-M2)n-M2-R
Chain Reaction Polymerization Ans✓✓✓A chain reaction initiated by a
cation, anion, or free radical.
ex: polymerization of styrene to polystyrene [free radical
polymerization]
Initiator in the Polymerization Rxn of Styrene Ans✓✓✓tert-butyl
peroxybenzoate, which upon thermal decomposition produces the
radicals necessary for .......?
,Propagation Ans✓✓✓Allows for growth of the polymer chain in free
radical polymerization
Radical Scavenger Ans✓✓✓Donates a hydrogen atom to reactive free
radicals converting them into non-radicals, such as preventing
polymerization with trace amounts of oxygen
Tert-butylcatechol Ans✓✓✓Radical Scavenger in Polymerization of
Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an
initiator
Removed Ans✓✓✓tert-butylcatechol must be __________ from styrene
prior to use (can use basic solution to do so)
Acidic, Base Ans✓✓✓The phenolic H atoms on tert-butylcatechol are
relatively _____ and can be deprotonated with ______ converting the
phenol into a water-soluble phenolate salt (polymerization experiment)
Step-Growth Polymerization Ans✓✓✓Involves a reaction between two
different difunctionalized monomers in which both functionalities react
to form the polymer
,ex: Nylon 6,6 polymerization
Nylon-6,6 Ans✓✓✓A type of polyamide prepared by reacting a diacid
or diacid chloride and a diamine, (such as Adipoyl chloride &
Hexamethylenediamine reacting with NaOH)
Nucleophilic Substitution Ans✓✓✓Diacid chloride is commonly used in
the lab because it's more reactive toward _________ ___________ and
milder reaction conditions can be used (during polymerization of Nylon-
6,6)
HCl & NaCl Ans✓✓✓A molecule of ______ & _____ are eliminated as
byproducts during polymerization of Nylon-6,6 and is neutralized by a
base
Organometallic Compounds Ans✓✓✓Extremely useful and versatile for
synthesis
Substances in which there is a carbon-metal bond & doesn't include
compounds in which metal atoms are bonded to organic molecules
through bonds to O,N,S,P, etc
Would Not Ans✓✓✓Metallic salts of carboxylic acids, phenols,
alcohols, etc _________ be defined as true organometallic compounds
, Would Not Ans✓✓✓Coordination compound of a transition metal with
ex. ethylenediamine or EDTA ______ be defined as true organometallic
compounds
Main group and Transition Ans✓✓✓Organometallic compounds are
known for both ________ _________ and ___________ metal elements
ex. Li, Mg, Cu, and Cd
Grignard Reagents Ans✓✓✓Organomagnesium halides which are
commonly prepared by a reaction between Magnesium metal and alkyl
or aryl halide
They're important for organic synthesis and are convenient precursors
from which other other organometallic compounds may be prepared
Addition to carbonyl compounds to produce alcohols Ans✓✓✓The
reaction we preformed that's an example of one of the most familiar
applications of Grignard Reagents was?
How Grignard Reagents are typically formed Ans✓✓✓These are formed
by exposure of an alkyl or aryl halide in diethyl ether solution to
magnesium metal, commonly in the form of Mg turnings or shavings
Grignard Reactions Ans✓✓✓These rxns are typically spontaneous and
exothermic once induction sets in; the combination of an exothermic rxn
and a solvent can be very volatile and highly flammable
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Polymers Ans✓✓✓Class of molecules that consist of repeating
structural units called monomers
Homopolymers Ans✓✓✓Polymers that consist of a single repeating
monomer (M)
R-M-(M)n-M-R
Copolymers Ans✓✓✓Polymers consisting of two distinct monomeric
units, M1 and M2, distributed at random in the polymer
R-M1-(M1-M2)n-M2-R
Chain Reaction Polymerization Ans✓✓✓A chain reaction initiated by a
cation, anion, or free radical.
ex: polymerization of styrene to polystyrene [free radical
polymerization]
Initiator in the Polymerization Rxn of Styrene Ans✓✓✓tert-butyl
peroxybenzoate, which upon thermal decomposition produces the
radicals necessary for .......?
,Propagation Ans✓✓✓Allows for growth of the polymer chain in free
radical polymerization
Radical Scavenger Ans✓✓✓Donates a hydrogen atom to reactive free
radicals converting them into non-radicals, such as preventing
polymerization with trace amounts of oxygen
Tert-butylcatechol Ans✓✓✓Radical Scavenger in Polymerization of
Styrene?
-results in phenol radical that's relatively unreactive and doesn't act as an
initiator
Removed Ans✓✓✓tert-butylcatechol must be __________ from styrene
prior to use (can use basic solution to do so)
Acidic, Base Ans✓✓✓The phenolic H atoms on tert-butylcatechol are
relatively _____ and can be deprotonated with ______ converting the
phenol into a water-soluble phenolate salt (polymerization experiment)
Step-Growth Polymerization Ans✓✓✓Involves a reaction between two
different difunctionalized monomers in which both functionalities react
to form the polymer
,ex: Nylon 6,6 polymerization
Nylon-6,6 Ans✓✓✓A type of polyamide prepared by reacting a diacid
or diacid chloride and a diamine, (such as Adipoyl chloride &
Hexamethylenediamine reacting with NaOH)
Nucleophilic Substitution Ans✓✓✓Diacid chloride is commonly used in
the lab because it's more reactive toward _________ ___________ and
milder reaction conditions can be used (during polymerization of Nylon-
6,6)
HCl & NaCl Ans✓✓✓A molecule of ______ & _____ are eliminated as
byproducts during polymerization of Nylon-6,6 and is neutralized by a
base
Organometallic Compounds Ans✓✓✓Extremely useful and versatile for
synthesis
Substances in which there is a carbon-metal bond & doesn't include
compounds in which metal atoms are bonded to organic molecules
through bonds to O,N,S,P, etc
Would Not Ans✓✓✓Metallic salts of carboxylic acids, phenols,
alcohols, etc _________ be defined as true organometallic compounds
, Would Not Ans✓✓✓Coordination compound of a transition metal with
ex. ethylenediamine or EDTA ______ be defined as true organometallic
compounds
Main group and Transition Ans✓✓✓Organometallic compounds are
known for both ________ _________ and ___________ metal elements
ex. Li, Mg, Cu, and Cd
Grignard Reagents Ans✓✓✓Organomagnesium halides which are
commonly prepared by a reaction between Magnesium metal and alkyl
or aryl halide
They're important for organic synthesis and are convenient precursors
from which other other organometallic compounds may be prepared
Addition to carbonyl compounds to produce alcohols Ans✓✓✓The
reaction we preformed that's an example of one of the most familiar
applications of Grignard Reagents was?
How Grignard Reagents are typically formed Ans✓✓✓These are formed
by exposure of an alkyl or aryl halide in diethyl ether solution to
magnesium metal, commonly in the form of Mg turnings or shavings
Grignard Reactions Ans✓✓✓These rxns are typically spontaneous and
exothermic once induction sets in; the combination of an exothermic rxn
and a solvent can be very volatile and highly flammable
