He

rea
res
omet
ipsf
ory
ou:

1
.Forqu e
stionsonti
trati
on,youshou
ldfi
rstper
for
mar ou
ghti
t r
ati
on,t
he nper
for
m2a ccu
r at
eti
tra
tio
ns.
Recor
dt heini
tia
lbure
tterea
d i
ngandfi
nalbure
tter
eadi
ngf
oreachti
trat
ion,the
ncal
cul
atet
h eti
tr
e.You
shoul
drecordevery
thi
ngi natabl
e.Al
lrea
dingsshou
ldber
eco
rd e
dto2d eci
ma l
pla
ces
.Thetitr
efort
he2
acc
uratetit
rati
onsshoul
dno tdi
ff
erbymo r
ethan0.10c
m3.Then,ca
lcu
lat
et hemea
ntit
reforthe2acc
urat
e
ti
tr
ati
ons .Themeanshouldbegiv
ento2d e
cimalpl
aces
.

2.Wh enplotti
ngg raph ,d
r a
wb o
tht heho ri
zont alandvert
icalaxi
so nthegr aphpape rcorr
e c
tly.
L abel
b oth
axiscorr
ectlyands tatetheunit(ifany).Useas uit
a bl
escal
eforbotha xi
sa ndd ono tuseanyo ddscale
ss uchas
3:
10. Boththex-axisa ndy -
axisneedno tstartfro m0( unl
esso th
erwisestatedb ythequ es
tion).Thesca l
es
shouldbecho se
ns ucht hatthepo i
ntsplottedo ng raphcoveratlea
sthalfof thegraphpa per.Pl
ota l
lpo i
ntson
thegrapha c
c u
ratel
y .Thepo i
ntss houldbea ccura t
etoh a
lfasma l
lsquare.Fo ral
l t
hepo i
nts ,
thei
rd i
ame ter
shouldnotb ela
r g
ert hanh al
fas ma l
lsquare.Th en,drawthecorrectst
raightl i
neorc ur
v e.
Wh e
nd rawingthe
st
r ai
ghtli
neo rcurve,itshouldpa s
st hrougha llpointsonthegraphifpo s
sib l
e.I
f t
h i
sisno tpossibl
e,theli
ne
orc u
rveshou l
dpa ssth r
ou g
ha sma nypo intso nt hegra
pha spossi
b l
e,al
lth epointsshou l
db ecl
o s
etoi tand
thenumb erofpo i
ntsa boveandb el
o wt heli
neo rc urveshoul
db eal
mo stequ al.
Wh end e
terminingtheg radi
ent
ofas t
rai
gh t
-li
neg raph ,
choose2po i
ntso nth elineanddrawat ria
ng l
e.Thed ist
anceb e
twe enthe2po ints
chosensho u
ldb eatleasthalfthelengtho ft
h eline.

3.Forq uestio
nso nqualit
at i
vea nal
y si
s,foreachc hemi ca
ltes t,yousho ul
du sea bou t1c
md e pt
ho r2c m3o feach
solut
ionu nlesso th e
rwises tate
db yt heq u
es t
ion. Tr ytoreco rdallobservati
o nsa nds tateif ther
eisa nycolour
changeo rifanypr eci
pitatefo r
ms .Fora nyc ol
o urc hang e
,ind ic
ateb ot
ht heinitialandf inalc ol
our,aswe l
las
thestageinwh i
c ht hechang eocc u
rsif moreth ano ner eagentsa rea d
ded .
Ifapr ecipitatef orms,statethecolour
ofpreci
pi tat
ea ndwh etheritiss ol
ubleine xcesso fth ereagenta dded,andifitiss olubles tatethecolourofth e
solut
ionf ormed .If y
o useea nyb ubblesformed, itme anst hatg asisrel
e as
ed,a ndy o usho uldca r
ryo utgastests
todeterminewh a tthegasis .Onlyg astestsinth eQu ali
tat
iv eAna l
y si
sNo tesa tthel as
tpa geo f
ques ti
onpa per
shouldbec arriedo ut.Theg asc anbea nyo neo fth e6g a
ses,b utbasedo nthet ypeo f r
eag entsa dde
da ndy our
experi
encei ndo ingCh emist rypracti
ca lwork,y ouma yb eab letopr e
dictthet ypeo f g
asr e
leasedandt hus
chooseth eappr opr i
ategast esttob ecarriedou t(Fo re xa
mpl e ,
ifame talisad dedtoa nu nkno wnso l
u t
ionand
gasisreleased,iti sl
ikelyth atthesolutionisana cida ndthu sh ydrogengasisr eleased,s oy oushouldc ar
ryo ut
thegaste stforh yd r
o ge
n). Statethate f
fervescenceo ccu
rsa nds tatetheob s
erv ati
o nso ftheg astestwh i
chis
posit
ivea ndth et ypeo fgasr el
eased.Wh end etermi ningthet ypeo fanu nknownc he mical,itshouldb ebasedon
youro b
s ervati
o nso fthec hemica l
testsc a
rriedo uta ndr ef
ert otheQu a l
it
a t
iveAna lysi
sNo tesatthel a
stpa ge
ofquesti
o np aper .
4.Foranyq ue
s ti
onsinvol
vingcalcul
ation,t
h enumb e
ro fs
igni
fica
ntfi
guresofyouranswershoul
dbee qualt
o
oronemo rethanthenumb erofsi
g ni
fi
c a
ntfiguresoftherawvalueuse
dint heca
lcul
ati
onwi t
hthele
a s
tnu mber
ofsi
gnif
icantfi
g u
res.Yousho u
ldsh owallwo rki
ngsandd onotskipanyimpo r
tantste
ps.Youmu s
ta l
sowr i
te
thecor
rectunitforthef
inalanswerifitisnotpro v
ided.Foracalc
ulat
ionquest
ionwh i
chrequi
resyoutou s
e
youranswerfromt heprev
iousq u
es t
ion,eve
ni fyouranswerforthepre
viousquest
ioniswrongandyo uusei
t
fort
hisquesti
o ncausi
ngyou ranswerforthisquesti
ont obewrong,usual
lyyouwillst
il
lgetf
ull
ma r
k sforthi
s
quest
ionaslonga syourcal
cu l
ati
onf orthi
sq ues
tioniscorre
ct.Thi
sisknowna s'er
rorcar
rie
dforward'.

5.Forques
tionsthatre
qu i
reexplanati
ono rdescriptio
n, yo
uranswermustbeverydet
ail
ed.
Yo uar
eadvise
dto
answeri
nc ompletese
ntencessoth a
ty o
ura nswe rcanb eeas
il
yu nd
erst
ood.Thenumberofma r
ksal
loc
atedfo
r
theques
tio
nu sual
lyshowst henumb erofpointsne ededinyourans
wer.Donotmi s
soutanyimport
antpoint
s
inyouranswer.Youareall
owe dtowr i
teextrapo intsi
ny ouranswer
,butyo
umu stbecare
fulnott
owriteany
point
swithwr ongfac
ts.Mar kswill
onlyb egiv
e nf o
rth ecor
rectpo
ints
.

6.Fora l
lquest
ions,youshou l
dusethecorrectex perimental
a ndCh e
mi s
trytermsiny o
uranswer.Dono t
repl
acethemwi t
ho thert
ermst hatar
eina ppropr i
a t
e,evenifthei
rme ani
nga rethesame.Youshouldspel
lal
l
experi
mentalandCh e
mi s
tryt er
mscorrectly.If
y ouc an'
tdos o,trytospel
l i
tinsuchawa ywhereitso
u nd
sthe
samea stheact
ualtermwh enr e
adout.Ma rksa reu s
u al
lynotd educ
tedforspell
inger
rorsinexper
imentala
nd
Ch e
mistryter
msa slongasi tst
il
lsoundst h
es amea ndthatitisnoteasi
lyconfusedwithothe
rterms.Ify
ou
spell
otherter
mswr o
ng l
yo rifyoumakeg ramma ti
ca le
rror
si nyouranswe r
,ma rkswil
lnotbededuct
edforas
l
o ngastheexaminercanund erst
andwh atyo uarewr i
ti
ng.Yo uareall
owedt ousesuit
ablesh
ortformsinyour
answer,suchasformulaforc h
emical
s u
bs tancesa nds ymbol
sf orunit
so fphysi
c a
lquanti
ti
es.

Ho
pey
ouf
indt
hisu
sef
ul!