Transcript Unit 2 Polymer test

Unit 2
Polymers
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1
3
A monomer used to make Kevlar is shown opposite. What is the percentage
of carbon by mass, in this monomer?
The diagram shows part a polyester polymer. Name the two monomers used
to make this polymer.
The diagram show 2 amino acids joined together. When this molecule is
hydrolysed which bond breaks?
4
The monomer that gives rise to this polymer is?
5
Which polymer can dissolve in water?
6
The graph shows an enzymes activity with increasing temperature. Which
statement best describes what is happening?
7
Bakelite is a thermosetting plastic. Its properties are due to?
8
Ethene is used as the building block of many polymers. What is the name
given to the process by which ethene is made into polythene?
2
A monomer used to make
Kevlar is shown opposite.
What is the percentage of carbon
by mass, in this monomer?
a. 50.1 %
b. 57.8%
c. 44.4 %
d. 80.0%
HO
CH
C
O
C
CH
C
CH
CH
O
C
OH
a hint!!!!
1st hint
What is the molecular formula?.
2st hint
What is GFM of this compound?
3rd hint
What is the mass of carbon?
A monomer used to make Kevlar is shown opposite.
What is the percentage of carbon by mass, in this monomer?
Correct because………….
HO
CH
C
O
CH
C
C
CH
O
C
CH
It’s molecular formula is C8H6O4.
Therefore (8x12)+(6x1)+(4x16) = formula mass
mass of Carbon
% mass of Carbon =
Formula mass
= (96/166) x 100 = 57.8%
OH
The diagram shows part a polyester polymer.
Name the two monomers used to make this polymer.
a. 1,6-hexanediol and 1,6-hexanedioic acid
b. 1,6-hexanediol and hexyl hexaneoate
c. 1,6-hexanedioic acid and hexyl hexanoate
d. Hexanol and hexanoic acid
a hint!!!!
A polyester is made from 2 monomers, a diol and a diacid.
The diagram shows part of a polyester. Name the two
monomers used to make this polymer.
1,6-hexanedioic acid
1,6-hexanediol
Correct because…………..
A polyester is made from a diol and a diacid.
1,6-hexanediol and 1,6-hexanedioic acid
The diagram show 2 amino acids joined together.
When this molecule is hydrolysed which bond
breaks?
a.
C-C
b.
C=C
c.
C-N
d.
C-H
H
H3C
CH
HO
C
O
N
H3C
CH
C
O
NH2
a hint!!!!
1st hint
Look at the peptide link
2nd hint
The peptide link looks like
O
H
C
H
Peptide link
The diagram show 2 amino acids joined together.
When this molecule is hydrolysed which bond
breaks?
Correct because………….
The peptide (amide) bond breaks. This means that
the C—N bond breaks during hydrolysis.
C - N
H R
O
H N C
C
H
H3C
CH
O H
H
Amino acid
HO
C
O
N
H3C
CH
C
O
NH2
The monomer which
is used to produce
polymer is?
a. 1,2 - dimethylbut-2-ene
b. 3, - methylhepta-3,4-diene
c. hex-3-ene
d. 2,3-dimethylbut-2-ene
a hint!!!!
1,2, dimethylbut-1-ene!!!!
CH3
CH2 C
H3C
CH2
a hint!!!!
3 - methylhepta-3,4-diene
CH3
H3C
CH2 CH
C
C
CH2 CH3
a hint!!!!
2,3-dimethylbut-2-ene
H3C
CH3 CH3
C
C
CH3
The monomer that gives rise to this polymer is?
Correct because…….
Hex-3-ene, the repeating unit in this polymer chain
is
The longest chain of this monomer has 6 carbons.
It also requires a double bond.
H
H
H
H
H
H
H
C
C
C
C
C
C
H
H
H
H
H
Which polymer can dissolve in water?
a. polystyrene
b. poly(ethenol)
c. polyamide, nylon 6,6
d. polytetrafluoroethene
a hint!!!!
Polystyrene is an excellent insulator and can be used for
drinking cups.
a hint!!!!
Nylon is an excellent fibre which is used for clothing
a hint!!!!
Another name for this polymer is teflon, used for non-stick
frying pans!
Which polymer can dissolve in water?
Correct because……..
Poly(ethenol) is a polymer made from the reaction between
a polymer called poly(ethenyl ethanoate) and methanol.
CH3
C
CH3
O
C
O
O
CH
CH
CH2
O
+ methanol
CH2
Polyethenyl ethanoate
Ester exchange
H
H
O
O
CH
CH
CH2
Polyethenol (polyvinyl alcohol)
CH2
The graph shows an enzyme’s
Activity
activity with increasing
temperature. Which statement best
describes what is happening?
Temperature
a. The enzyme’s activity increases with temperature
b. The enzyme’s activity slows down after a certain
temperature. This effect is reversible.
c. The enzyme’s activity works best at an optimum
temperature.
d. The enzyme’s activity is increased after a certain
temperature. This effect is irreversible.
a hint!!!!
Does the graph show that this is always true?
a hint!!!!
After a certain temperature the enzyme shape changes
permanently.
The graph shows an enzyme’s activity with increasing
temperature. Which statement best describes what is
happening?
Correct because ……..
The enzyme’s activity works best at an optimum
temperature. Enzymes are biological catalysts. Their
activity increases with temperature until an optimum
temperature is reached. If it gets too hot the
enzyme denatures, its shape changes permanently.
Activity
Temperature
H
Bakelite is a
thermosetting
plastic. This property
is due to?
CH
HC
HC
a. The aromatic nature
of its structure.
b. Cross-linking
covalent bonding
C
CH
C
H
C
C
H
H
H
C
HC
CH
C
CH
C
H
C
C
H
H
HC
HC
C
CH
C
CH
C
H
H
C
HC
CH
CH
C
H
CH
C
H
H
C
HC
C
CH
C
CH
c. Hydrogen bonding
between the polymer chains
d.The number of carbon/carbon double bonds
C
H
C
HC
C
CH
CH
CH
a hint!!!!
Bakelite is a rigid, hard and fairly brittle plastic. What must
be true about the polymer chains?
a hint!!!!
Look at the cross-linking in the structure of bakelite!
Bakelite is a thermosetting plastic. This property is due
to?
Correct because ….
Bakelite is a thermosetting plastic. It is made by heating
phenol and methanal, to form a network which is crosslinked by strong covalent bonding
H
CH
HC
HC
Cross linking
C
CH
C
H
C
C
H
H
H
C
HC
CH
CH
C
H
C
C
C
H
H
HC
HC
C
CH
C
CH
C
H
H
C
HC
CH
CH
C
H
CH
C
H
H
C
HC
C
CH
C
CH
C
H
C
HC
C
CH
CH
CH
Ethene is used as the building block of many polymers.
What is the name given to the process by which ethene
is made into polythene?
a. Condensation polymerisation
b. Hydrogenation
c. Oxidation
d. Addition polymerisation
a hint!!!!
Making polythene only uses one monomer.
a hint!!!!
This process adds hydrogen across a C=C bond.
a hint!!!!
This involves the addition of oxygen.
Ethene is used as the building block of many polymers.
What is the name given to the process by which ethene
is made into polythene?
Correct because….
Poly(ethene) is formed from ethene in an addition
polymerisation.
n C2H4
addition
polymerisation
( C2H4 )
n = a large number
n