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Konstruk Konteks / Topik Aras Markah Skema

Sintesis Covalent Bonds Tinggi 1 B

Kertas 1

Diagram shows the set-up of apparatus of electrolysis of concentrated potassium chloride solution.

Which of the following statements are true about the electrolysis

! "ydrogen gas is released at the electrode #

!! $%ygen gas is released at the electrode &!!! Chlorine gas is released at the electrode &

!' &otassium is deposited at the electrode #

( ! and !! only C !! and !' onlyB ! and !!! only D !!! and !' only

Soalan

Carbonelectrode #

Carbon

electrode &

Concentrated potassium chloride

solution

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Kertas 2

Konstruk Konteks / Topik Aras Markah

Sintesis )ormation of Compounds Tinggi *

Sintesis !onic Bonds Tinggi 1

Sintesis !onic Bonds Tinggi *

Soalan

Diagram shows Daniell cell.

+d, Write the half euation for the reactions that occur at both positive terminal and negativeterminal.

  &ositive terminal /////////////////////////////////////////////////// 

  0egative terminal ////////////////////////////////////////////////// 

+e, State an observation that can be observed from the e%periment.

Copper+!!, sulphate solution

'

Copper inc

&orous pot

inc sulphate solution

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+f, !n a separate e%periment2 the 3inc plate and 3inc sulphate solution are replaced with the pairs of plates and solutions as in the Table. The voltmeter readings are recorded as follows

Plate Solution Voltage / V

4agnesium 4agnesium sulphate *.5*

!ron !ron+!!, sulphate 6.57

(luminium (luminium sulphate *.66

+i, 8eferring to the voltage in the Table2 arrange the metals magnesium2 iron2 copper andaluminium in increasing order of their positions in the electrochemistry series.

Skema :

+d, &ositive terminal Cu*9  9 *e →  Cu

  0egative terminal n →  n*9  9 *e+e, inc plate becomes thinner : copper plate becomes thic;er 

+f, +i, copper2 iron2 aluminium2 magnesium