3. 2 | P a g e
Question 1: Choose the correct Answer ( 12 only) K (1.1) 12M
① A standard hydrogen electrode has _____ electrode potential.
A) 0.0 V A) 0.9 V
C) 2.0 V C) 96500 V
②The constitute of a “Daniell” cell is:______
A) Cu - Ag cell B) Zn – Ag cell
C) Zn – Cu cell D) Zn – Fe cell
③In an electrochemical cell____________
A) potential energy changes into electrical
energy.
B) chemical energy changes into electrical
energy.
C) kinetic energy decreases. D) potential energy decreases.
④Due to the presence of ___________ NaCl conducts electricity
A) free molecules B) free ions
C) free atoms D) free electrons
⑤The quantity of electricity required to liberate or deposit 1 gram equivalent of a
substance from its solution during electrolysis is known as: _______
A) Faraday B) Coulomb
C) Ampere D) Volt
⑥ Magnesium metal can be attached to the steel pipeline to prevent rusting. What name
is given to this type of protection provided by magnesium? -----------------
A) Galvanizing B) Evaporation
C) Condensation D) Sacrificial
⑦ A device in which electric current is produced at the expense of spontaneous chemical
reaction is__________
A) voltaic cell B) electrolytic cell
C) voltameter D) Faraday
⑧ When electrolysis of aqueous NaCl solution is carried out, the products are_________
A) Na at cathode and Cl2 at anode. B) H2 at cathode and O2 at anode
C) Na at cathode and O2 at anode. D) H2 at cathode and Cl2 at anode
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⑨___ is the amount of electricity required to deposit 1 mol of Al from a solution of AlCl3 ?
A) 1 Faraday B) 1 ampere
C) 3 Faradays D) 3 Ampere
⑩ Iron when exposed to moist air for a long time acquires a coating of a brown flaky
substance called________
A) rust B) polymer
C) proton D) electron
⑪ In a dry cell, the anode is made up of_______
A) zinc B) sodium
C) graphite D) calcium
⑫The process used to deposit one metal over another metal is called________
A) electrolysis B) electroplating
C) rusting D) sublimation
⑬In the following reaction: Fe + Zn+2 → Fe+2 + Zn
A) Fe is reduced B) Fe is evaporated
C) Fe is oxidized D) Fe not changes
⑭What is the oxidation number of carbon in the ethanoate ion (𝐶2𝐻3𝑂2
−
) ? _______
A) +1 B) +½
C) 0 D) –1
⑮In the standard notation for a voltaic cell, the vertical line "||" represents: ___
A) gas electrode B) a phase boundary
C) a wire (metal) connection D) a salt bridge
5. 4 | P a g e
Question 2: Match the following items (in column B) with its descriptions (in
Column (A)- write suitable number. K (1.2) 10M
Column A
____ Galvanic cells or a group of galvanic cells connected
in series, where its total potential is equal to the
sum of the potentials of the individual cells.
____ Steel covered with zinc layer.
____ A galvanic cell that uses hydrogen (as fuel), which
reacts with oxygen, and a large amount of energy
from the reaction is available to produce electricity.
____ A device used to connection توصيل reduction with
oxidation half-cells in an electrochemical cell.
____ Electrode at which oxidation occurs.
____ Unit used to measure electromotive force of a cell
____ Completely dissociate in water.
____ The amount of substance produced at each
electrode is directly proportional to طرديا تتناسب مع
the quantity of charge flowing through the cell.
____ An ionic compound that dissolves in water to
produce ions, which can conduct electricity.
____ A unit of electrical charge widely used in
electrochemistry and equal to ≅ 96500
𝐶
𝑚𝑜𝑙
____ Partially dissociate or break apart in water.
____ Splitting substance by passing electric current
through it.
____ Ion has a positive charge.
Column B
1 Salt bridge .
2 Cation.
3 Electrolysis.
4 Weak electrolytes
5 Faraday constant
(F)
6 Electrolyte
7 Faraday's 1st.law.
8 Strong electrolytes.
9 Volt (V).
10 Anode.
11 Ohm (Ω).
12 Fuel cell.
13 Galvanized steel.
14 Batteries.
15 Salt bridge..
16 Cathode.
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6. 5 | P a g e
Question 3: 2.1) 08M
A galvanic cell has Mg/Mg2+ and Cu/Cu2+ half-cells.
a) Draw a labelled diagram البيانات مكتمل رسما ارسم of the above galvanic cell.
On the diagram show وضحححح the anode, cathode, salt bridge, electrolytes and direction of
electrons flow .االلكترونات مرور اتجاه 3M
b) Write the anodic, cathodic and overall equation 3M
الكلية المعادلة و الكاثود و االنود معادلة اكتب
للخلية
Anodic reaction: _________________________________________
Cathodic reaction: _________________________________________
Overall reaction: _________________________________________
c) Calculate 𝐸𝐶𝑒𝑙𝑙
𝑜
at 25°C 1M
d) What is the notation of this cell؟ االصطالحي الرمز 1M
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7. 6 | P a g e
Question 4: S (2.1) 09M
For the following cell
what type of cell is shown? (Voltaic or Electrolytic)?
__________________________________________
which electrode will act as anode?
__________________________________________
which electrode will act as Cathode?
__________________________________________
which is the anodic half-cell reaction?
__________________________________________
what is the cathodic half-cell reaction?
__________________________________________
what is the overall reaction of the cell?
__________________________________________
what is the direction of the electron flow in this cell?
__________________________________________
Is this reaction being spontaneous or not?
__________________________________________
What happen to the mass كتلة of Ag electrode after finish electroplating process?
__________________________________________
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8. 7 | P a g e
Question 5: S (2.1) 11M
Draw a neat labelled diagram of one of the following and answer the related
question 5M
1- H2−O2 fuel cell- Write the reaction occurs at Anode of the cell. 4M
The reaction occurs at Anode of the cell 1M
2- A section of a dry cell – write the reaction occurs at the cathode of the cell 4M
The reaction occurs at the cathode of the cell 1M
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9. 8 | P a g e
B) Solve the following problems 6M
Calculate 𝐸𝑐𝑒𝑙𝑙 for this reaction;
𝟐𝑪𝒆(𝒂𝒒)
𝟒+
+ 𝟐𝑪𝒍(𝒂𝒒)
–
⟶ 𝟐𝑪𝒆(𝒂𝒒)
𝟑+
+ 𝑪𝒍𝟐(𝒈) 𝑬𝒄𝒆𝒍𝒍
∘
= 𝟎. 𝟐𝟓𝑽
under the following nonstandard conditions and determine whether it will occur
spontaneously: [Ce4+] = 0.013 M, [Ce3+] = 0.60 M, [Cl−] = 0.0030 M,
PCl2 = 1.0 atm, and T = 25°C. 2M
What is the mass of Cu formed at the cathode when a current of 0.25 A is passed
through a CuSO4 solution for 1 hour (where, Cu = 63.5)? 2M
𝑪𝒖𝟐+
(𝒂𝒒) + 𝟐𝒆−
→ 𝑪𝒖(𝒔)
1.0 N solution of a salt surrounding two platinum electrodes 0.5 cm apart and 0.5
cm2 in area was found to offer a resistance of 100 Ω. Calculate the equivalent
conductivity of the solution. 2M
