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Electrochemistry

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

cathode is the electrode where

a)

reduction takes place

b)

oxidation takes place

c)

either reduction or oxidation

d)

none of these

2.

in electrochemical cell anode is

a)

positive

b)

negative

c)

neutral

d)

none

3.
Which energy conversion shown below takes place in an electrochemical cell?
a)
Electrical to chemical
b)
Mechanical to chemical
c)
Mechanical to electrical
d)
Chemical to electrical
4.
Oxidation happens at the
a)
Anode
b)
Cathode
c)
Salt bridge
d)
Voltmeter
5.
This electrode in a voltaic cell gains mass
a)
Anode
b)
Cathode
6.
What unit of measurement do we use to measure electrical potential?
a)
Watts
b)
Volts
c)
Amps
d)
Ohms
7.
In which direction does electricity flow in a voltaic cell (battery)?
a)
Electrons flow from the cathode to the anode
b)
Electrons flow from left to right
c)
Electrons flow from anode to cathode
d)
Electrons flow from right to left
8.

Which of the metals would be the anode in a battery with these two elements?

a)

Gold

b)

Cadmium

c)

Neither could serve as the anode

9.
What occurs to the mass of zinc electrode in the following reaction?
Zn/Zn+2 // Ag+1 / Ag
a)
increases
b)
decreases
c)
remains the same
10.
If the cell potential is negative, the reaction is?
a)
 a success
b)
spontaneous
c)
not spontaneous
11.
Which cell is not spontaneous?
a)
voltaic
b)
electrolytic
12.

Which metal is dissolving into the solution?

a)

Nickel

b)

Copper

13.

Which direction will the potassium ions (K+1) from the salt bridge flow?

a)

Towards the copper sulfate solution

b)

Towards the nickel sulfate solution

c)

Towards the copper metal

d)

Towards the nickel metal

14.
What is the function of porous pot in Daniel Cell..?
a)
To complete the circuit
b)
Enable the movement of ion
c)
Dont mix the solution
15.
Nickel Cadmium cell is..
a)
rechargable
b)
Producing high voltage
c)
poisonous
d)
Easily spilled
16.
Electrolysis of copper(ii) sulphate solution produced colourless bubble gas. What is it..?
a)
Oxygen gas
b)
Hydrogen gas
c)
nitrogen gas
d)
hydroxide gas
17.
What does the double line mean?
Zn/Zn+2 // Cu+2/Cu
a)
anode
b)
cathode
c)
salt bridge
d)
substance in contact
18.
What is the function of cryolite in the process of removing aluminium from its ore..?
a)
reduce the melting point of aluminium
b)
Act as cathode
c)
Remove impurities
19.
A voltaic cell created by a number of cells connected in a series.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
20.
A voltaic cell in which the electrolyte is a paste.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
21.
A voltaic cell in which the materials to be oxidized or reduced may be continuously supplied.
a)
dry cell
b)
wet cell
c)
battery
d)
fuel cell
22.
In a hydrogen-oxygen fuel cell, what is the material that is reduced?
a)
hydrogen
b)
oxygen
c)
water
d)
glucose
23.
In a voltaic cell involving zinc metal and one of its salts and copper metal and one of its salts, which metal would be used as the anode?
a)
zinc
b)
copper
24.
The electrolysis of brine produces
a)
water, sodium metal and chlorine gas
b)
aqueous sodium hydroxide, hydrogen gas and chlorine gas
c)
sodium metal and hydrogen gas
d)
hydrochloric acid and sodium metal
25.
The electrolysis of molten sodium chloride produces
a)
hydrochloric acid
b)
sodium metal and chlorine gas
c)
chlorine gas and aqueous sodium hydroxide
d)
glucose
26.
The electrolysis of water produces
a)
acids and bases
b)
hydrogen gas only
c)
hydrogen gas and oxygen gas
d)
oxygen gas only
27.
The covering of a thin layer of metal is
a)
electrowinning
b)
electrorefining
c)
electroplating
d)
electromachining
28.
To electroplate an object it would have to be made to be the
a)
anode
b)
cathode
29.
To electroplate an object with silver it would have to be the __________ and have a __________ charge.
a)
anode, positive
b)
anode, negative
c)
cathode, positive
d)
cathode, negative
30.
Which is true about fuel cells
a)
designed so they emit no polllutants
b)
very inexpensive
c)
produces energy in short bursts only
d)
never built or used
31.
Which of the following is true using the following electrochemical reaction:
Mn/Mn(NO3)2 // PBSO4/Pb
a)
Pb is oxidized
b)
Mn is reduced
c)
A strip of Pb is put into solution of Mn(NO3)2
d)
electrons are lost at the Mn electrode
32.
Ecell = Ecathode - Eanode. Is this equation true or false?
a)
True
b)
False
33.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
34.
Which is the correct oxidation half reaction for the reaction:
Al(s) + Zn(NO3)2(aq) → Al(NO3)3(aq) + Zn(s)
a)
Al(s) + 3e- →Al3+ (aq)
b)
Zn(s) → Zn2+(aq) + 2e-
c)
Al(s) → Al3+(aq) + 3e-
d)
Zn2+(aq) +2e- →Zn(s)
35.

How many moles of aluminum metal can be deposited when 0.600 moles of electrons are passed through 4.00 moles of molten Al2O3?

a)

0.100

b)

0.200

c)

1.33

d)

1.80

36.

Which of the following statements concerning galvanic cells is/are true?

a)

The two half-cells are connected by a salt bridge.

b)

Electrons flow from the anode to the cathode.

c)

Reduction occurs at the cathode.

d)

All of the above are true.

37.

Assume that the following reaction proceeds in an electrolytic cell. If 1.5A of current are used for 2.0 hours, what will plate and how many grams are expected?

Fe+2 (aq) + Ni (s) --> Fe (s) + Ni+2 (aq)

a)

Iron plates; 3.1 grams

b)

Iron plates; 8.7 x 10-4 grams

c)

Nickel plates; 3.3 grams

d)

Nickel plates; 9.1 x 10-4grams

38.

Assume that the following reaction proceeds in an voltaic cell. If the concentration of Ag+1 (aq) is 0.10M and the concentration of Au+3 (aq) is 1.0M, what is the expected voltage from this reaction?


Ag(s) + Au+3 (aq) --> Ag+1 (aq) + Au(s)


Ag+1 + e- = Ag E° = +0.799V

Au+3 + 3e- = Au E° = +1.50V

a)

less than 0.70 V

b)

more than 0.70 V

c)

exactly 0.70 V

39.

with decrease in concentration , molar conductivity

a)

decreases

b)

increases

c)

remains constant

d)

none

40.

specific conductance decreases with

a)

decrese in concentration

b)

increse in concentration

c)

remains constant

d)

none

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