CHAPTER 6.docx (group cemerlang + group harapan).docx

7/23/2019 CHAPTER 6.docx (group cemerlang + group harapan).docx

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CHAPTER 6: ELECTROLYSIS :STRUCTURE A

1 Diagram 5 shows the apparatus setup use! "# a pupi$ to e$etrop$ate a% iro%

spoo% with &opper'

(a) *hat is mea%t "# a% e$e&tro$#te+

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,'

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,'

-. marks/

(") *h# a% e$e&tro$#te is a"$e to &o%!u&t e$e&tri&it#+'

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

-0 mark/

(&) 1ame e$e&tro$#te 2'

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

-0 mark/

(d)*hat is the o"ser3atio% at the a%o!e a%! the &atho!e !uri%g thee4perime%t'

(i) A%o!e : ',,,,,,,,,,,,,,,'',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,''

(ii) Catho!e : ',,,,,,,,,,,,,,'',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

-. marks/

(iii) *rite the ha$ euatio% or the rea&tio% ta7i%g p$a&e at the a%o!e'

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,''

E$e&tro$#te 2Iron spoon

Zinc electrode


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Copper(II) su$phate so$utio%

&opper8eta$ P

-0 mark/

(e) A pupi$ wa%te! to &o%stru&t the e$e&tro&hemi&a$ series'' He measure! the pote%tia$!i9ere%&e o a ew pairs o meta$s' The setup o the apparatus o his e4perime%t isshow% "e$ow

Ta"$e 5 shows the 3o$tmeter rea!i%gs he o"tai%e! rom the pairs o meta$s'

ase! o% the ta"$e a"o3e;

(i) !etermi%e the pote%tia$ !i9ere%&e i the pupi$ uses P a%! R as thee$e&tro!es'

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

-0 mark/(ii) arrange the metals in an ascending order according to their relative position in the

electrochemical series.

..

[1 mark]

E4perime%tPair o meta$s Pote%tia$

!i9ere%&e

< =

1egati3e

e$e&tro!e

Positi3e

e$e&tro!eIIIIIII=

P>RS

CopperCopperCopperCopper

0'0?.'@.?'@?'B5


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A

P QE$e&tro$#te R

E$e7tro$it R

TRIAL TERE1A1U .??

Diagram '. shows the set up o the apparatus use! to e$e&trop$ate a% iro% 7e# withsi$3er meta$'

Rajah '.menunjukkan susunan radas yang digunakan untuk menyadur satu kunci besi

dengan logam perak.

ase! o% Diagram '. :Berdasarkan Rajah'. :

(i) State the &orre&t positio% o the iro% 7e# either e$e&tro!es P or >'Nyatakan kedudukan yang betul bagi kunci besi samada elektrod Patau>.

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''

-0 mark/

(ii) 1ame a suita"$e so$utio% that &a% "e use! as e$e&tro$#te R'Namakan satu larutan yang sesuai digunakan sebagai elektrolit R.

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''-0 mark/

(iii) Suggest o%e step that must "e ta7e% to get a "etter e$e&trop$ate! 7e#'Cadangkan satu langkah yang perlu diambil untuk mendapatkansaduran yang baik pada kunci tersebut.

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''''''''''''

'''''''''''''''''''''''''''''''''''''-0 mark


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Impure &opper p$ate

epi%ga% 7uprum ta7 tu$e%

Pure &opper p$ate

epi%ga% 7uprum tu$e%

Copper(II) su$phate so$utio%

Laruta% 7uprum(II) su$at

A

E$e&tri&a$ sour&e

Sum"er te%aga e$e7tri7

X Y

(&) Diagram ' shows the setup o apparatus o a puriF&atio% pro&ess'Rajah 'menunjukkan susunan radas bagi suatu proses penulenan.

(i) I!e%ti# the a%o!e a%! the &atho!e'Kenal pasti anod dan katod'

2 : ,,,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''

Y : ,,,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''-0 mark/

(ii) Duri%g this pro&ess; the i%te%sit# o the "$ue &o$our o &opper(II)

su$phate remai%s u%&ha%ge!' E4p$ai% wh#'Semasa proses ini, didapati keamatan warna biru larutan kuprum(II)sulfat tidak berubah.erangkan mengapa.

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

,,,,,,,,,,,,,,,,,,,,,,,,,''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

-. marks/

' A simp$e &hemi&a$ &e$$ is show% i% Diagram 0

Diagram 1

Copper (II) sulphate solution

Zinc metal Copper metal


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=

a) I!e%ti# the %egati3e termi%a$ a%! positi3e termi%a$'

i) 1egati3e termi%a$ : ''.........................................................................................

ii) Positi3etermi%a$ : ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''............

-. mar7s/

") State the o"ser3atio% at the positi3e termi%a$'

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

-0 mar7/&) *rite the ha$ euatio%s or the rea&tio% at

i) 1egati3etermi%a$!...............................................................................................

ii) Positi3etermi%a$! ..............................................................................................

"# marks$

!) *rite the o3era$$ euatio% or the &e$$ a"o3e'

' ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

-0 mar7/

B' Diagram . shows a 3o$tai& &e$$ "etwee% $ea! a%! &opper meta$S i% their respe&ti3ee$e&tro$#tes'

Diagram 2a) I!e%ti# the positi3e a%! %egati3e termi%a$s o the 3o$tai& &e$$'

i) Positi3etermi%a$ : ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

ii) 1egati3etermi%a$ : ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

") *rite the io%i& euatio%s or the rea&tio%s at the positi3e a%! %egati3e termi%a$s'


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i) Positi3etermi%a$ : ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

ii) 1egati3etermi%a$ : ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

&) *rite the o3era$$ euatio% o the &e$$'

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

!) State the u%&tio% o the sa$t "ri!ge'

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

e)*hat is the e%erg# &o%3ersio% i% the 3o$tai& &e$$+ '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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