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WorksheetsREDOX Review (No Table J or Cells)
Total questions: 27
Worksheet time: 25mins
The oxidation state of any element by itself is...
0
+1
-2
Whatever it says on the Periodic Table
The sum of the oxidation numbers of a compound is...
Always Posiotive
Always Negative
0
Impossible to determine.
What is the sum of the oxidation state in the Phosphate ion (PO43-)?
0
+4
-3
+3
What is the oxidation number for elements in Group 2?
+1
+2
-1
-2
Determine the Oxidation State for each of the following
Mg2+
+2
Cl
0
Cl in NaCl
-1
S in LiHSO4
+6
O in H2O
-2
Decide if each of the following is true of Oxidation or Reduction.
Electrons Lost
Becomes more Positive
Oxidation State Increases
Electrons Gained
Becomes more Negative
Oxidation State Decreases
Electrons are Products (Right of Arrow)
Electrons are Reactants (Left of Arrow)
What is NOT true about all REDOX Reactions?
They involve the transfer (gain/loss) of electrons.
They occur simultaneously (at the same time).
They result in a change in oxidation state.
They must always involve oxygen?
In a balanced REDOX reaction, electrons lost must be...
greater than electrons gained.
equal to electrons gained.
less than electrons gained.
double the electrons gained.
Which are conserved during all reactions? Check all that apply.
Mass
Charge
Phase
Energy
Match the following.
Oxidized
Reducing Agent
Reduced
Oxidizing Agent
REDOX Reaction
Zn + HCl --> ZnCl2 + H2
NOT REDOX Reaction
NaCl + AgNO3 --> AgCl + NaNO3
Which species is oxidized in the following reaction?
2 Ag+(aq) + Cu(s) ⟶ 2 Ag(s) + Cu2+(aq)
Ag
Ag+
Cu
Cu2+
What is the oxidation number of chlorine in HClO?
0
-1
+1
+5
Which equation represents a redox reaction?
NaOH + HNO3 → NaNO3 +H2O
2AgNO3 + Zn → Zn(NO3)2 + 2Ag
2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3
CaCO3 + 2HCl → CaCl2 + H2O + CO2
The following chemical equation represents the extraction of silicon from quartz using coke.
SiO2 + C → Si + CO2
What is the change in oxidation number of silicon?
+2 to 0
+4 to 0
0 to +2
0 to +4
Which half-reaction correctly represents reduction?
Ag --> Ag+ + e-
F2 --> 2 F- + 2e-
Au3+ + 3e- --> Au
Fe2+ + e- --> Fe3+
What is the reducing agent here: N2 + 3H2 --> 2NH3
N2
H2
NH3
2NH3
In the reaction
4 NH3 + 5 O2 → 4 NO + 6 H2O
the oxidation number of nitrogen changes from
–2 to –3
–2 to +3
–3 to –2
–3 to +2
What is the oxidizing agent in the following reaction?
Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s)
Zn (s)
Cu2+ (aq)
Zn2+ (aq)
Cu (s)
What is the oxidation number of X in XO4-?
+4
+5
+7
+8
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+
In the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?
Zn0
Zn+2
O-2
H20
None
The sum of the oxidation numbers in SCN- is equivalent to
0
-1
+1
+3
Mg → Mg2+ + 2e–
___ Al + ___ Fe+2 → ___ Al+3 + ___ Fe
Which of the following is a reducing agent in the reaction 2Fe3++Sn2+→2Fe2++Sn4+ ?
Fe3+
Fe2+
Sn2+
Sn4+
