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Electrochemistry

Total questions: 16

Worksheet time: 22mins

Name
Class
Date
1.

Electrochemistry is

a)

Study of electron in atom

b)

Study of electricity in molecules

c)

The relationship between chemical reactions and electricity

d)

the study of electrons moving from one a tom to another

2.

An oxidizing agent will

a)

increase in mass

b)

lose electrons

c)

be reduced

d)

increase in oxidation number

3.

Pb + 2Ag+ → Pb+2 + 2Ag


The chemical species being reduced is

a)

Ag

b)

Pb

c)

Pb+2

d)

Ag+

4.
What reaction occurs at the anode?
a)
Ag+ + e- →Ag
b)
Ag → Ag+ + e-
c)
Ni2+ + 2e- → Ni
d)
Ni → Ni2+ + 2e-
5.
What unit of measurement do we use to measure electrical potential?
a)
Watts
b)
Volts
c)
Amps
d)
Ohms
6.

In a galvanic cell with the following cell notation:

 Ni(s)Ni+2(aq)Co+2(aq)Co(s)\left|Ni\left(s\right)\right|Ni^{+2}\left(aq\right)\parallel Co^{+2}\left(aq\right)\left|Co\left(s\right)\right|  

Which of the following is true?

a)

Ni is being reduced

b)

 Co+2 is being oxidizedCo^{+2}\ is\ being\ oxidized  

c)

Energy will be added to operate this cell.

d)

This cell operated spontaneously

7.

In electrochemical cell Anode is of which charge

a)

–ve

b)

+ve

c)

No charge

d)

Both charge

8.

In electrochemical cell, reduction takes place at

a)

Right

b)

Left

c)

Top

d)

Bottom

9.

When aqueous copper(II) chloride solution is electrolysed using copper electrodes, the half-equation for the reaction that occurs at the anode is

a)

Cu2+ + 2e -------> Cu

b)

Cu --------> Cu2+ + 2e

c)

2Cl- --------> Cl2 + 2e

d)

4OH- --------> 2H2O + O2 + 4e

10.

What are the cations present in zinc sulphate solution?

a)

Zn2+

b)

Zn2+, SO42

c)

Zn2+ , H+

d)

OH- , SO42-

11.

Which metal is the negative electrode?

Zn/Zn2+ // Cu2+/Cu

a)

zinc

b)

copper

12.

Galvanic cells convert

a)

mechanical energy in to electrical energy

b)

potential energy in to electrical energy

c)

electrical energy in to chemical energy

d)

chemical energy in to electrical energy

13.

In electrolysis, particles which move towards cathode are called

a)

anions

b)

cations

c)

photons

d)

positrons

14.

Which of the species strong oxidizing agent?


Cl2(g) + 2e → 2Cl-(aq) Eocell = + 1.36 V

Cu2+(aq) + 2e → Cu(s) Eocell = + 0.34 V

Ni2+(aq) + 2e → Ni(s) Eocell = – 0.25 V

Ca2+(aq) + 2e → Ca(s) Eocell = – 2.87 V

a)

Cl2(g)

b)

Cu2+(aq)

c)

Ni2+(aq)

d)

Ca2+(aq)

15.

Which is correct to write cell notation

Anode: Zn

Cathode: Ni

a)

Zn2+ (aq,1M) / Zn (s) // Ni (s) / Ni2+ (aq,1M)

b)

Zn (s) /Zn2+ (aq,1M) // Ni2+ (aq,1M) / Ni (s)

c)

Zn2+ (s,1M) / Zn (aq) // Ni (aq) / Ni2+ (s,1M)

d)

Zn (aq) /Zn2+ (s,1M) // Ni2+ (s,1M) / Ni (aq)

16.

Calculate standard cell potential for this equation:


Zn2+(aq) + 2e → Zn(s) Eº = – 0.76 V

Cd2+(aq) + 2e → Cd(s) Eº = – 0.40 V

a)

Eocell = -0.36 V

b)

Eocell = -1.16 V

c)

Eocell = +1.16 V

d)

Eocell = +0.36 V