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The materials revolution

Electronegativity


A) Explain the term Electronegativity, recall qualitatively the electronegativity trends in the
periodic table use relative electronegativity values to predict bond polarity in a covalent
bond decide whether a molecule is polar or nonpolar from its shape and the polarity of it's
bonds.


The
elect
ronegat…

Page 2

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Bel
ow
the
Tg,
the
amor
phous
regi
ons
(r
andoml
y ar
ranged
chai
ns)
ar
e f
rozen
whi
ch
prevent
s chai
ns
fr
om
movi
ng
over
one
anot
her
,
reduci
ng
the
fl
exi
bil
i
ty
of
t
he
pol
ymer
,
maki…

Page 3

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Benzene
ri
ngs
are
fl
at.
Pol
ymer
s wi
th
benzene
ri
ngs
can
be
packed
and
squashed
mor
e t
han
nor
mal
pol
ymer
chai
ns.
Pol
ymer
chai
ns
are
ther
efor
e mor
e st
rong
and
dense.













E) Recognise members of the following homologous…

Page 4

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G) Explain the difference between addition and condensation polymerisation


Dur
ing
condensation polymerisation t
w o
dif
fer
ent
monomer
s j
oin
toget
her
f
ormi
ng
a
condensat
ion
pol
ymer
wi
th
the
eli
minat
ion
of
a smal
l
mol
ecul
e.

I
n addition polymerisation…

Page 5

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ACID + Amides

Ami
de
+ wat
er
ami
ne
+ car
boxyl
i
c aci
d











ALKALI + Amides


Ami
de
+ wat
er
ami
ne
+ car
boxyl
i
c aci
d














Neutralisation of amines by acids


Ami
nes
dissol
ve
readi
ly
in
w at
er,
f…

Page 6

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Ami
nes,
l
i
ke
ammoni
a,
can
accept
a
hydr
ogen
ion
fr
om
w at
er
or
fr
om
an
aci
d:











Acylation of amines to form an amide


Ami
nes
react
wi
th
acyl
chl
ori
des
in
an
Acyl
ati
on
react
ion
and
the
product…

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