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WorksheetsTopic IX: Redox Test Review Quizizz
Total questions: 30
Worksheet time: 8hrs 30mins
Given the redox reaction: Fe2+ + Al → Fe + Al3+
As the reaction takes place, there is a transfer of
protons from Fe2+ to Al
electrons from Fe2+ to Al
protons from Al to Fe2+
electrons from Al to Fe2+
What is the oxidation number of chlorine in HClO3?
(a)
Which half reaction correctly represents reduction?
Zn + 2e- →Zn+2
2 Br- + 2e- → Br2
Sn0 + 2e- → Sn+2
Ag+ + 1e- → Ag
In the reaction
Zn + Fe+2 → Zn+2 + Fe, the oxidizing agent is
Zn+2
Fe
Zn
Fe+2
In the reaction
MgO + 2SO2 → 2MgS + 3O2, the oxidation number of the sulfur went from
+2 to -2
+4 to -2
-4 to +2
-2 to +4
Which oxidation number change could occur during an oxidation half-reaction?
+2 to 0
+3 to +2
+4 to +2
0 to +2
Which is a redox reaction?
OH- + H+ → H2O
Cl2 + H2 → 2HCl
KNO3 + LiNO2 → LiNO3 + KNO2
SO2 + H2O → H2SO3
The reaction FeO + CO → CO2+ Fe is an example of
both oxidation and reduction
neither oxidation and reduction
oxidation only
reduction only
When 1 mole of S is reduced to 1 mole of S-2, 2 moles of electrons are
lost by S
gained by S-2
lost by S-2
gained by S
What occurs in the half reaction Ag → 1e- + Ag+?
Ag gains electrons
Ag is reduced
Ag+ is oxidized
Ag is oxidized
What is true about this reaction?
Mg + 2Li+ → 2Li + Mg+2
both mass and charge are conserved
neither mass and charge are conserved
only mass is conserved
only charge is conserved
In any redox reaction the total number of electrons lost is
unrelated to the total number of electrons gained
greater to the total number of electrons gained
less than to the total number of electrons gained
equal to the total number of electrons gained
As an Mg+2 ion is reduced to a Mg atom, the number of protons in the nucleus
decreases
remains the same
increases
increases then decreases
Electroplating is best described as
a voltaic cell that uses an electric current
a voltaic cell that produces an electric current
an electrolytic cell that produces an electric current
an electrolytic cell that uses an electric current
What part of a voltaic cell permits the flow of electrons?
the salt bridge
the wire
the electrodes
the load
In the chemical reaction,
2Al + 3Ni+2 → 3Ni + 2Al+3, which species is oxidized?
Al
Ni+2
Ni
Al+3
Given the reaction
Zn + 2HCl → H2 + ZnCl2, what is the correct reduction half reaction?
2H+ → 2e- +H2
Zn → 2e- + Zn+2
2H+ + 2e- → H2
Zn + 2e- → Zn+2
When the switch is closed, electrons in the external circuit will flow from
Cu to Zn
Cu to Cu+2
Zn to the Cu
Zn to Zn+2
When the redox reaction
_ Al+3 + _Zn → _Al + _Zn+2 is completely balanced, the coefficient of the Zn+2 is
1
2
3
4
Which redox reaction is correctly balanced?
Mg + H+ → 2Mg+2 + H2
K + 2H+ → K+1 + H2
Mg + 2Br- → Mg+2 + Br2
Mg + 2H+ → Mg+2 + H2
Given Fe+2 + X → X+2 + Fe,
X must represent which atom according to Reference Table J?
Sn
Zn
Pb
Cu
During electrolysis of fused KBr, which half reaction occurs at the positive electrode?
2e- + Br2 → 2Br-
K+ + 1e- →K
2Br- → 2e- + Br2
K → 1e- + K+
Which equation represents the half reaction taking place at the coin?
Ag+ + 1e- → Ag
Cu+2 +2e- →Cu
Ag → 1e- + Ag+
Cu→ 2e-+ Cu+2
In the reaction
Cu+2 + Ni → Cu + Ni+2, which substance undergoes reduction?
Ni
Cu
Cu+2
Ni+2
Which electrode will decrease in mass?
Zn
Zn+2
Fe
Fe+2
Which electrode undergoes reduction?
Zn
Zn+2
Fe
Fe+2
What would be the direction of electron flow?
From Fe to Zn
From Zn to Fe
Given the reaction: Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)
Which statement correctly indicates the change that occurs?
One mole of Cu(s) gains a total of 1 mole of electrons.
One mole of Cu(s) loses a total of 2 moles of electrons.
Two moles of Ag+(aq) loses a total of 2 moles of electrons.
Two moles of Ag+(aq) gains a total of 1 mole of electrons.
Given the balanced equation representing a reaction occurring in an electrolytic cell:
2LiBr(l) → 2Li(l) + Br2(g)
Where is Li (l) produced in the cell?
at the cathode, where reduction occurs
at the anode, where oxidation occurs
at the anode, where reduction occurs
at the cathode, where oxidation occurs
Which ion is most easily reduced?
Mg2+
Ca2+
K+
Fe2+
