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Page 1

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GCSE SCIENCE REVISION

CHEMISTRY (P2)



OK i
t'
s t
ime t
o s
top
faf
fi
n about
and
get
stuck
in
to
some
revi
si
on .
I
f
you want
to
do wel
l
i
n your
sci
ence
G CSE you
w i
l
l
need…

Page 2

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To
repr
e sent
t
he coval
ent
b onds
in
mo l
ecules
such
as
w at
er,
ammo ni
a,
hydr
og en,

hydr
ogen chl
ori
de,
chlori
ne,
me t
ha ne
and oxygen
and
in
giant
st
ruct
ures
such
as
di
amo nd
and…

Page 3

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Name of particle Charge
Prot
on +1
Neutr
on
0
El
ectron
.1

I
n an
atom,
the numbe r
of
el
ectr
ons i
s equal
t
o t
he number
of
pr
otons
in
the
nucl
e us.

At
oms
have no over
all
el
ectr
ical
char…

Page 4

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Wh en
atoms share
pair
s of
el
ectr
ons,
they
for
m coval
ent
bonds.
The se
bonds
between
at
oms
are st
rong.
Some
covalent
ly
bonded subst
ances
consi
st
of
simple
molecul
es
such
as H2,
C l
2,
O 2,
HCl,
H2O and CH4.

Other…

Page 5

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(
d)I
n whi
ch
group
of
the
per
iodi
c t
abl
e i
s t
his
el
ement
?




(
e)Draw
a si
mil
ar
diagr
am
to
show t
he
ion
for
med
by
thi
s at
om
in
ioni
c
compounds.
Show
the
char
ge
on…

Page 6

Preview of page 6
(
b)Draw
a dot
and
cross
di
agr
am
to
show t
he
bondi
ng
in
a mol
ecul
e of
hydr
ogen
chl
ori
de. (
2)




(
c)Expl
ain
w hy
hydr
ogen
and
chl
ori
ne
for
m a
singl
e coval
ent
bond.




(
d)Expl
ain…

Page 7

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(
b)Draw
a dot
and
cross
di
agr
am
to
show t
he
arr
angement
of
el
ect
rons
in
an
oxi
de
ion. (
3)




(
c)What
i
s
the
for
mul
a of
magnesi
um
oxi
de?




5 Ber
zel
ius
(1779­1848)
car
ri
ed
out
exper
iment…

Page 8

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(
1)

(
ii
)Use
thi
s exampl
e t
o expl
ain
the
rel
ati
onshi
p bet
ween
technol
ogy
and
sci
ence.




(
1)

6 The
diagr
am
repr
esent
s at
oms
of
pot
assi
um
in
the
sol
id
met
al.




(
a)What
i
s…

Page 9

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Subst
ances t
hat
have si
mp l
e molecul
ar,
gi
ant
ioni
c and gi
ant
coval
ent
str
uctur
es
have
very
dif
fer
ent
propert
ies.
I
oni
c,
covalent
and
me tal
li
c bonds
are
str
ong.
The
f
orces
between mol
e cul…

Page 10

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Nanosci
ence r
efers
to
str
uctures
that
ar
e
1 100 nm i
n si
ze, of
t
he order
of
a f
ew
hundred
at
oms .
Nanopart
icl
es show di
ff
erent
propert
ies
to
the same ma t
eri
als
in
bulk
and have
a…

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