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Electrochemistry and Corrosion

Total questions: 71

Worksheet time: 50mins

Name
Class
Date
1.

What is reduction?

a)

It is the gain of electrons.

b)

It is the loss of electrons.

c)

It is the creation of electrons.

d)

It is the destruction of electrons.

2.

What is oxidation?

a)

It is the gain of electrons.

b)

It is the loss of electrons.

c)

It is the creation of electrons.

d)

It is the destruction of electrons.

3.

What is an anode?

a)

It is the electrode where oxidation takes place.

b)

It is the electrode where reduction takes place.

c)

It is an aqueous solution containing an electrode.

d)

It is the salt bridge that connects half-cells.

4.

What is a cathode?

a)

It is the electrode where oxidation takes place.

b)

It is the electrode where reduction takes place.

c)

It is an aqueous solution containing an electrode.

d)

It is the salt bridge that connects half-cells.

5.
Is this an example of corrosion?
a)
Yes
b)
No
6.

What conditions are required for rusting?

a)

water only

b)

oxygen only

c)

water and oxygen

7.

In which test tube would you expect the nail to rust the most?

a)

A

b)

B

c)

C

d)

D

8.

Which of the following is true about an electrolyte?


I Electrolyte conducts electricity in molten state.

II Electrolyte conducts electricity in solid state.

III Electrolyte is soluble in water.

IV Electrolyte undergoes chemical decomposition when it conducts electricity.

a)

I and II only

b)

II and III only

c)

II and IV only

d)

I and IV only

9.

Which of the following is not an electrolyte?

a)

Molten glucose

b)

Aqueous ammonia

c)

Molten lead (II) bromide

d)

Molten potassium iodide

10.

Which of the following is most probably substance X?

a)

Molten napthalene

b)

Pure ethanol

c)

Solid lead (II) bromide

d)

Potassium iodide solution

11.

Oxidation is the loss of electrons from some chemical species.

a)

True

b)

False

12.

The oxidation state of a species undergoing oxidation decreases

a)

True

b)

False

13.

The oxidation state of the species undergoing reduction is

a)

decreased

b)

increased

c)

no change

14.

Kind of cell in the picture

a)

galvanic

b)

electrolytic

15.

Using iron as a cathode to prevent corrosion

a)

cathodic protection

b)

passivation

c)

galvanization

d)

coating

16.

The species oxidized in corrosion

a)

Fe

b)

O2

c)

Mg

17.

Species reduced in corrosion

a)

O2

b)

Fe

c)

Mg

18.

Salinity favors corrosion.

a)

True

b)

False

19.

Kind of cell in the picture

a)

electrochemical

b)

voltaic

c)

electrolytic

d)

galvanic

20.

Uses electrical energy to pump electrons.

a)

galvanic cell

b)

voltaic cell

c)

electrochemical cell

d)

electrolytic cell

21.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What species is oxidized?

a)

Fe

b)

Cu2+

c)

Fe2+

d)

Cu

22.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What species is reduced?

a)

Fe

b)

Cu2+

c)

Fe2+

d)

Cu

23.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What is the oxidant?

a)

Fe

b)

Cu2+

c)

Fe2+

d)

Cu

24.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What is the reductant?

a)

Fe

b)

Cu2+

c)

Fe2+

d)

Cu

25.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

How many electrons are gained?

a)

2

b)

0

c)

4

d)

6

26.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

How many electrons are lost?

a)

0

b)

2

c)

4

d)

6

27.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

Which half-reaction can be found in the anode?

a)

Fe + 2e- ----> Fe2+

b)

Fe ----> Fe2+ + 2e-

c)

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

d)

Cu2+ + 2e----> Cu

28.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

Which half-reaction can be found in the cathode?

a)

Fe + 2e----> Fe2+

b)

Fe----> Fe2+ + 2e-

c)

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

d)

Cu +2e ----> Cu2+

29.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What is your cathode electrode?

a)

Fe

b)

Cu

30.

In the reaction: Fe + Cu2+ --->Fe2+ + Cu

What is your anode electrode?

a)

Fe

b)

Cu

31.

Assuming that the redox reaction in the galvanic cell:

Fe + Cu2+ --->Fe2+ + Cu

What is the movement of electrons?

a)

Fe to Cu

b)

Cu to Fe

32.

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

33.

What is oxidation?

a)

A reaction involving oxygen

b)

A reaction involving non-metals

34.
Is this an example of oxidation?
a)
Yes
b)
No
35.
Which of the following statement is WRONG?
a)
The process of losing the electron is called Oxidation
b)
An oxidation reaction is often called a cathodic reaction
c)
The process of receiving the electron is called Reduction
d)
A reduction reaction is often called a cathodic reaction
36.
Is the following equation an example of oxidation?
Cu + O2 ---> 2 CuO
a)
Yes
b)
No
37.
Is the following equation an example of oxidation?
Na + Cl ----> NaCl
a)
Yes
b)
No
38.
What is corrosion?
a)
The release of oxygen
b)
Breakdown of a metal
39.

Name the two general classifications of corrosion.

a)

Direct chemical attack and Electrochemical attack.

b)

Fretting corrosion and Galvanic attack.

40.

Rusting is a _____________ process.

a)

Mechanical

b)

Chemical

c)

Physical

41.

Rusting is a special term, given to the corrosion metal is... .

a)

Au

b)

Pt

c)

Fe

d)

Ag

42.

What is the chemical name given to Rust ?

a)

Iron dioxide

b)

Steel oxide

c)

Iron oxide

d)

Carbon dioxide

43.

What two things cause Iron to Rust ?

a)

Air and Oxygen

b)

Oxygen and Water

c)

Water and Carbon dioxide

d)

Carbon dioxide and Air

44.

Rusting can be prevented by

a)

Alloying

b)

Tinning

c)

Galvanizing

d)

All of above

45.
What is the name of negative electrode?
a)
Cathode
b)
Anode
c)
Cation
d)
Anion
46.
What is the name of positive electrode?
a)
Cathode
b)
Anode
c)
Cation
d)
Anion
47.
Which of the following statement is TRUE regarding Anodic and Cathodic reactions?
a)
Both reactions take place simultaneously
b)
Both reactions take place one after another
c)
Both reactions must occur at a different rate
d)
Both reactions must occur at a fast rate
48.

two types of Noble metals

a)

gold and platinum

b)

iron and copper

c)

stainless steel and aluminum

d)

tin and brass

49.
Which of the following metals is very unreactive and unlikely to corrode. 
a)
Copper
b)
Gold
c)
sodium
d)
Potassium
50.

What is an anode?

a)

It is the electrode where oxidation takes place.

b)

It is the electrode where reduction takes place.

c)

It is an aqueous solution containing an electrode.

d)

It is the salt bridge that connects half-cells.

51.

What is a cathode?

a)

It is the electrode where oxidation takes place.

b)

It is the electrode where reduction takes place.

c)

It is an aqueous solution containing an electrode.

d)

It is the salt bridge that connects half-cells.

52.

Electrons always flow from

a)

cathode to anode

b)

anode to cathode

53.

Given their standard reduction potentials, which of the species is going to be oxidized?

Cu2+/Cu = 0.34V

Zn2+/Zn = -0.76V

a)

Cu

b)

Zn

c)

CuSO4

d)

ZnSO4

54.

What occurs to the mass of copper electrode in the following reaction?

Zn/Zn2+ // Cu2+/Cu

a)

increases

b)

decreases

c)

remains the same

55.

Which metal is the negative electrode?

Zn/Zn2+ // Cu2+/Cu

a)

zinc

b)

copper

56.

What reaction occurs at the anode?

Ag+/Ag = 0.80V

Ni2+/Ni = -0.25V

a)

Ag+ + e- →Ag

b)

Ag → Ag+ + e-

c)

Ni2+ + 2e- → Ni

d)

Ni → Ni2+ + 2e-

57.

What is the chemical nature of rust?

a)

iron (II) oxide

b)

hydrated iron (II) oxide

c)

iron (III) oxide

d)

hydrated iron(III) oxide

58.

Do all metals rust?

a)

Yes

b)

No

59.

Do all metals corrode?

a)

Yes

b)

No

60.

True or False, rusting is the specific term used to describe the corrosion of iron.

a)

True

b)

False

61.

Fill in the blanks;

Iron + __________ + __________ = Iron oxide

a)

oil + water

b)

water + carbon dixoide

c)

oxygen + oil

d)

water + oxygen

62.

Why is rusting a problem?

a)

It looks ugly, no one likes orange

b)

It makes iron really bendy

c)

It makes iron lose its strength

63.

Which of the following is not a rust prevention technique?

a)

Hydrating

b)

Electroplating

c)

Painting

d)

Galvanising

64.

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

65.

An electrolytic cell uses electrical energy to drive

a)

chemical reaction

b)

physical reaction

c)

no reaction

d)

none of above

66.
Which metal does not corrode because of its lack of reactivity
a)
zinc
b)
magnesium
c)
nickel
d)
gold
67.
The most common way of protecting iron objects from corrosion is to paint them so oxygen and moisture cannot touch the metal
a)
true
b)
false
68.
Iron is less reactive than zinc
a)
true
b)
false
69.
Given the activity series, when a piece of silver is dropped into a container of hydrochlorice acid, HCl, the reaction will take place and produce hydrogen gas, H₂
a)
true
b)
false
70.
Magnesium is less reactive than silver
a)
true
b)
false
71.
Choose the oxidation number of H in HCl
a)
(+1)
b)
(+2)
c)
(-1)
d)
(-2)

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