Module 1 - Common Mistakes

I have gone through all of my module one chemistry papers and picked out the questions that I have got wrong so as to compile a document with all of the questions which are commonly answered wrong. NB/ I have not made these questions up myself and they are all copyright of CCEA examining board.

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Common
Dif
fi
cul
ti
es
in
Modul
e 1
C hemi
st
ry
(f
rom
C CEA
paper
s 20072010)
I
do
not
own
any
of
these
quest
i
o ns
1.Wh i
c h
of
the f
ollo w in g
orbi
tal
s is occupi
ed by
an
elect
ron
w i
t
h
the
energy l
evel
n=2?
AA d umb bel
l
s h a p ed
orbi
ta l
BA s pheri
call
y s h a p ed orbi
tal
C An s
o r
d or
b ita l
D An s
o r
p or
b ita l
+ 2+
2.The sp ecies
A r
, K a nd Ca h a v e t
he same numb er
of
elect
rons.
Star
ti
ng wit
h
t
he
sma l
lest,
wh ich o ne
of
the
f o l
lowing
is
the
o rder
i
n whi
ch t
heir
radi
i
incr
ease?
2+ +
AA r C a K
+ 2+
BA r K Ca
2+ +
C Ca K Ar
+ 2+
D K Ar C a
3.The re act
ion of
o x i d i
s ing
age nt s
w i
th
potassi
um i
odide
can be
used t
o
prepar
e
i
od i
ne i
n t
h e
labo ra to r
y.
Wh en h eat
ed wit
h man ganese di
oxi
de and concent
rat
ed
sul
furic aci
d ,
pota s s i
u m iodi
de li ber
ates
iodi
ne.
2KI
+
MnO2+
3H2SO4 2KHSO4 +MnSO4 +
2H2O +
I2
Usi
ng
oxi
dat
ion
number
s,
expl
ain
thi
s r
edox
react
ion.
________________________ _____________________________________
________________________ _____________________________________
________________________ _____________________________________
_____________________[
3]
4.Wh y
can
a n
exc
e ss
of
w at
er
not
be
used
in
an
exper
iment
wi
th
hydr
ogen
br
omide?
_____ ________________________________________________________
_____[
1]
5.Expl
ain
w hat
woul
d be
obser
ved
if
a
test
t
ube
of
hydr
ogen
chl
ori
de
w as
heat
ed.
__ ___________________________________________________________
_____[
1]
6.Expl
ain
the
rel
ati
ve
ther
mal
st
abi
li
ty
of
the
hydr
ogen
hal
ides.
________________ _____________________________________________
________________ _____________________________________________
_____________[
1]

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The
sil
ver
chl
ori
de pr
eci
pit
ate
is
w hi
te
w hen obt
ained
but
changes
i
ts
ap pear
ance
if
l
eft
f
or
some t
ime i
n the
li
ght.
Suggest
why
thi
s
coul
d af
fect
t
he
resul
ti
ng
per
cent
age
det
ermi
nat
ion
of
si
lver
.
________ ________________________________________________________
_____[
1]
12.…read more

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Name
a sol
uti
on
that
wi
ll
di
ssol
ve
sil
ver
chl
ori
de.
________ _____________________________________________________
_____[
1]
18.Si
lver
chl
ori
de i
s a
w hi
te
soli
d whi
ch
is
af
fect
ed
by
li
ght
.
D esc
ribe
and
expl
ain
the
e f
fect
of
l
i
g ht
on
sil
ver
chlor
ide.
________________ _____________________________________________
________________ _____________________________________________
_____________[
2]
19.…read more

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