Water is hydr hydrid id of oxyg oxygen en Th bond bondin in in wate wate mole molecu cule le is resu result lt of th over overla lapp ppin in of th orbi orbita tals ls of oxyg oxygen en an hydr hydrog ogen en atom atoms. s. (a)
(i)
What is mean mean by orbital? el 2.
(ii)
th quan quantu tu
numb number er
(iii)
Draw Draw
ng
labe labell lled ed diag diagra ra
ap
of
at
show showin in th over overla lapp ppin in of orbi orbita tals ls in water water molecul molecules. es. [6 mark marks] s]
up
(b)
50
Calc Calcul ulat at th fina fina temp temper erat atur ur of marks]
(c)
25.0
cu nt usin usin grap graphi hite te elec electr trod odes es
hr gh um alcu alcula late te he volu volu e, in em', em', of he ga evol evolve ve at th anod anod at marks]
no
(a)
(i)
ex
Desc Descri ribe be th prop proper erti ties es of etha ethano noic ic acid acid as an
Bron Bronst sted ed-L -Low owry ry acid acid
in th prep prepar arat atio io
of
buff buffer er solu soluti tion on marks]
Phen Phenol olph phth thal alei ein, n, Ph is an acid acid-b -bas as indi indica cato to in th pH ange ange betw betwee ee 8. an 9.8. 9.8. equi equili libr briu iu equa equati tion on of phen phenol olph phth thal alei ei in aque aqueou ou solu soluti tion on is as foll follow ows. s. (b)
wp (c)
s in in a
he
marks]
solu soluti tion on is prep prepar ared ed by mixi mixing ng 250. 250. cnr' cnr' of 0.05 0.05
ol dm
50 marks]
(a)
ci
nt
us
ch
al marks]
Regi Regi aqua aqua is mixt mixtur ur of on part part of conc concen entr trat ated ed nitr nitric ic acid acid an thre thre part part of conc concen entr trat ated ed d. ed ve al ai gi aqua aqua reac reacts ts on gold gold base base on th foll follow owin in equa equati tion on (b)
4H+
4Cr
N0
Au
? AuCI
NO
2H [4 mark marks) s)
(c)
82
962/2
an -912 -912.1 .1 kJ mol" mol" espe espect ctiv ivel el ra r iin nt s of of e
Stat Stat
hich hich of thes thes tw oxid oxides es is
*Thi *Thi pape pape is CONF CONFID IDEN ENTI TIAL AL unti unti th exam examin inat atio io is over over
