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WorksheetsElectrochemistry Test Review
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
Which metal does not corrode because of its lack of reactivity
a)
zinc
b)
magnesium
c)
nickel
d)
gold
2.
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
3.
When a piece of iron is dropped into a container of zinc chloride solution, what is the correct chemical reaction?
a)
Zn(s) + FeCl(aq) → Fe(s) + ZnCl₂(aq)
b)
Fe(s) + ZnCl₂(aq) → Zn(s) + FeCl₂(aq)
c)
No Reaction
4.
Iron is less reactive than zinc
a)
true
b)
false
5.
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
6.
Which metal can replace iron in this reaction: <br />___ (s) + FeCl₂(aq) → Fe(s) + ___Cl₂(aq)
a)
cadium (Cd)
b)
lead (Pb)
c)
mercury (Hg)
d)
chromium (Cr)
7.
Which of the following reactions cannot happen?
a)
Al(s) + Fe₂O₃(aq) → Al₂O₃(aq) + Fe(s)
b)
Fe(s) + CuSO₃(aq) → FeSO₃(aq) + Cu(s)
c)
Ag(s) + HCl(aq) → AgCl(aq) + H₂(g)
d)
Al(s) + HCl(aq) → AlCl₃(aq) + H₂(g)
8.
Magnesium is less reactive than silver
a)
true
b)
false
9.
Which of the following metals can replace Hydrogen bonded to another substance?
a)
magnesium (Mg)
b)
Zinc (Zn)
c)
Aluminum (Al)
d)
All of the above
10.
Given the activity series, when a piece of copper is dropped into a container of water what is the correct chemical reaction?
a)
No Reaction
b)
Cu(s) + H₂O(l) → CuO(aq) + H₂(g)
c)
Cu(s) + H₂O(l) → CuH(aq) + O₂(g)
11.
What is the oxidation state for Lithium when it is ionized?
a)
(+1)
b)
(+2)
c)
0
d)
(-1)
12.
Choose the oxidation number of H in HCl
a)
(+1)
b)
(+2)
c)
(-1)
d)
(-2)
13.
For monatomic ions, the oxidation number is equal to the charge of the ion
a)
true
b)
false
14.
What is the oxidation state of manganese in the anion MnO₄¹⁻
a)
(+4)
b)
(+7)
c)
(+5)
d)
(+3)
15.
The oxidation number of a free/pure element, such as Zn(s), O₂(g), Al(s)
a)
1
b)
equal to the subscript of the symbol
c)
equal to the atomic number of the element
d)
0
16.
The gain of one or more electrons in a reaction is called ____.
a)
oxidation
b)
reduction
17.
In this reaction between Zn and S, why do we say that the Zn was oxidized?<br />Zn(s) + S₈(s) → ZnS(aq)
a)
Zn gained e-
b)
Zn lost e-
c)
Zn attached to S
d)
Zn went from (s) to (aq)
18.
The loss of one or more electrons in a reaction is called ____.
a)
oxidation
b)
reduction
19.
In this half reaction, K is ____.<br />K(s) → K⁺(aq)
a)
oxidized
b)
reduced
20.
Redox reactions include all chemical reactions in which atoms have their oxidation state changed
a)
true
b)
false
21.
A substance which causes another substance to be reduced is called a/an ____.
a)
catalyst
b)
reducing agent
c)
oxidizing agent
d)
none of the above
22.
The oxidizing agent is the substance that causes oxidation by accepting electrons
a)
true
b)
false
23.
The ____ agent is the substance that causes reduction by losing electrons
a)
oxidizing
b)
reducing
24.
Given this equation, what is the oxidizing agent?<br />Cl₂(g) + KOH(aq) → KCl(aq) + KClO₃(aq) + H₂O(l)
a)
Cl
b)
K
c)
H
d)
O
25.
What is the reducing agent in this reaction?<br />HNO₃(aq) + Cu(s) → Cu(NO₃)₂ + NO(g) + H₂O(l)
a)
H
b)
N
c)
O
d)
Cu
26.
A reaction cannot have an oxidizing agent without also having a reducint agent
a)
true
b)
false
27.
What is the oxidizing agent in this reaction?<br />CH₄(g) + O₂(g) → CO₂(g) + H₂O(l)
a)
O
b)
H
c)
C
28.
Given the reaction below what substance is oxidized?<br />HNO₃(aq) + Cu(s) → Cu(NO₃)₂ + NO(g) + H₂O(l)
a)
H
b)
N
c)
O
d)
Cu
29.
What happens to the oxidation number of an element that is reduced in a reaction?
a)
Its oxidation number changes from negative to positive
b)
Its oxidation number decreases
c)
Its oxidation number may increase or decrease
d)
Its oxidation number increases
30.
Given this reaction, the oxidation number of Mg changes from ___, meaning that Mg is being ___.<br />Mg(s) + N₂(g) → Mg₃N₂(s)
a)
0 to -3; oxidized
b)
0 to +2; oxidized
c)
0 to -3; reduced
d)
0 to +2; reduced
31.
For the redox reaction: A + B → products, if the oxidation number of A increases, then the oxidation number of B must decrease
a)
true
b)
false
32.
In this reaction, what is oxidized?<br />Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a)
Al
b)
Cr
c)
O
33.
In Cr(OH)₂ the oxidation number for O is __ and H is __.
a)
O: +2, H: -1
b)
O: -2, H: +1
c)
O: -1, H: +1
d)
O: +1, H: -1
34.
Consider this reaction, C₂H₄ is being ____.<br />C₂H₄(g) + H₂(g) → C₂H₆(g)
a)
oxidized because the oxidation number of the carbon atom is decreasing
b)
reduced because the oxidation number of the carbon atom is increasing
c)
reduced because the oxidation number of the carbon atom is decreasing
d)
oxidized because the oxidation number of the carbon atom is increasing
35.
What happens to the oxidation number of an element that is oxidized in a reaction?
a)
its oxidation number increases
b)
its oxidation number may increase or decrease
c)
its oxidation number changes from positive to negative
d)
its oxidation number decreases
36.
In this reaction, what is reduced?<br />Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a)
Al
b)
Cr
c)
O
37.
A device that allows a redox reaction to generate electrical energy is called a(n) ____
a)
electrochemical cell
b)
generator
c)
Faraday
d)
electricity cell
38.
If a strip of Zn metal is placed directly into a solution of Cu²⁺ ions, the result is best described as:
a)
an electrochemical cell
b)
an electrolytic cell
c)
a direct redox reaction
d)
no reaction will occur
39.
How is electricity generated from a redox reaction?
a)
Redox reactions cannot be used to generate electricity
b)
The redox reaction causes other reactions to occur which generate electricity
c)
The electrons from a direct redox reaction do electrical work
d)
The electrons from a redox reaction are passed through an external conducting material between the different substances
40.
In what state do electrochemical reactions usually take place?
a)
gas
b)
liquid
c)
solid
d)
aqueous solutions
41.
A battery is a type of electrochemical cell
a)
true
b)
false
42.
In a voltaic cell, the half-cells are connected by an apparatus that allows for the flow of electrons
a)
true
b)
false
43.
Oxidation occurs at the ____.
a)
oxidizing agent
b)
reducing agent
c)
anode
d)
cathode
44.
Which of the following is/are correct for voltaic (galvanic) cells?
a)
It generally consists of two different metals connected by a salt bridge
b)
A voltaic cell produces electrical energy as a result of a spontaneous redox process
c)
Both of these are true
45.
The metal strips that are immersed into ion solutions are called ___.
a)
half-cells
b)
salt bridges
c)
terminals
d)
electrodes
46.
Electrons flow from the cathode to the anode in a voltaic cell
a)
true
b)
false
47.
In an electrochemical cell, chemical energy changes into useable electrical energy
a)
true
b)
false
48.
In an electrochemical cell compose of Zn and Cu, which correctly describes the reaction taking place in the copper half-cell?
a)
The oxidation of copper ions to copper metal
b)
The reduction of copper ions to copper metal
c)
The oxidation of copper metal to copper ions
d)
The reduction of copper metal to copper ions
49.
What processes occur during electroplating?
a)
oxidation only
b)
reduction only
c)
both oxidation and reduction
d)
neither oxidation or reduction
50.
A block of chromium metal is placed into a solution that has chromium ions. A car bumper is connected to the cathode/negative side of the batter and the chromium block is connected to the anode/positive side of the batter. What half reaction will be occuring at the cathode?
a)
No reaction occurs at the cathode
b)
Fe³⁺(aq) + 3e- → Fe(s)
c)
Cr(s) → Cr³⁺(aq) + 3e-
d)
Cr³⁺(aq) + 3e- →Cr(s)
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