Chemistry C2- Higher

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Grade Content Book Ref
C
2a
:
Pa
int
s
&
Pi
g
me
nt
s
1 D,C Pai
nt
is
a colloid:
t
he part
icl
e s
are mixed
w i
th
par t
icl
es of
a
li
qui
d but
are not P 112
di
ssol
ved
2 B ­ A* A
coll
oid
w i
ll
not separat
e bec ause t
he par
ti
cles are
dispersed t
hroughou t
the mi
xtur
e
and
are
so small t
hey wil
l
not set
tl
e
at t
h e
bott
o m
3 D,C Pai
nts
are
a ppl
ied
a s
a t
hin
su r
face
w hi
ch
dri
es wh en t
he sol
vent
evaporates. P 112
Emulsi
on pa i
nts as
w at
er
ba sed paint
s
4 B ­ A* When oi
l
p aints
dry,
t
h e
oil
i
s oxidized (oxi
da t
ion)
by
atmospheri
c oxygen
5 D,C Synt
het
ic
dyes
has
incr
eased
the
number
of
col
our
s avai
labl
e t
o col
our
f
abr
ic
s
6 D,C Uses
of
ther
mo chr
omic pi
gme nt
s: P 113
w arni
ng
o f
a
hot
cup
u se i
n e l
ectr
ic
kett
les
.
7 B ­ A* Thermo chromi c
p i
g ments
can b e
added
to
acrylic paints t
o gi
ve
a wider range of
colour change s
8 D,C Pho sphor
e scen t
pi
gme nt
s absorb and store
en ergy and
rel
ease
it
as
li
gh t
over a
peri
od
of
ti
me
9 B ­ A* Pho sphor
e scen t
pi
gme nt
s are
mu ch safer
than
th e al
ternati
ve
radi
oacti
ve
substances (
w h i
c h can
lead
to
c ancer)
e.g.
i
n use of
`glow i
n t
he dar
k'
w atches
.
C
2b
:
Co
ns
tru
cti
on
ma
ter
ial
s
1 D,C Const
ruct
ion
mater
ial
s come f
rom
rocks
in
the
Ear
th'
s cr
ust
: P 115
0 a l
umini
um and i
ron
fr
om ores
br
ick
fr
o clay
m
glass
fr
om sand
1 D,C Mar
ble
is
much harder
than
li
mest
one.
Grani
te
is
harder
than
mar
ble P 116
1
1

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B ­ A* I
gneous and
me t
amo r
phic
rocks
are
harder than
sedimentar
y rocks
Grani
te,
marbl
e and
li
mes t
one have
diff
e r
ent hardness.…read more

Page 3

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D,C Al
loys
oft
en have
proper
ti
es
that
ar
e di
ff
erent
f
rom the
me t
als
they
are
ma d e
fr
om
and P 125
t
hat
these
propert
ies
may make
the
all
oy
mo r
e useful
than
the
pure
me t
al
5
2 B ­ A* `
Smart
all
oys'
e.g.
n i
ti
nol
,
have a
shape memory propert
y.
This has
increased
the
number
of
applications
of
all
oys e.
g.…read more

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B ­ A* Human
inf
luences
on
the
compo s
it
ion
of
air
: P 133
3 Deforestation ­ l
ess
photosynt
hesi s
takes
place
Increased energy consumption
(bur
ning
of
fossi
l
fuel
s)
Population increase ­
incr
eased
demand f
or
energy
Evol
uti
on of
t
he atmo sphe r
e:
degassing from the Ear
th'
s cr
ust
­
gases
escapi
ng
fro m
Ear
th'
s cr
us
t
i
nit
ial
at
mospher
e was
made
of…read more

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Graphs
can
show how
fast
a
react
ion
g oes
and
when i
t
stops
.
A
react
ion
that
goes f
aster
(l
i
n e
B) t
han anot
her
reaction
(l
ine
A)
has
a
st
eeper
l
ine
.
A
react
ion
ha s
stopped
w hen
the l
i
n e
on t
h e
graph
fl
at t
ens
.…read more

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Custard powder, flour
and
sulfur
are
dange r
ous
explosives.…read more

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