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Edexcel A-Level Chemistry
Core Practicals
CP8 Investigating Electrochemical Cells
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Electrochemical cells convert chemical energy into
electrical
energy through spontaneous redox reactions.
Electrodes are conductors where oxidation and reduction occur in
electrochemical
cells.
The salt bridge in an electrochemical cell maintains electrical
neutrality
by allowing ion movement.
Sequence the flow of electrons and ions during the operation of an electrochemical cell.
1️⃣ Electrons flow from the anode to the cathode through an external circuit.
2️⃣ Ions in the salt bridge migrate to balance the charge in the electrolytes.
The reduction half-reaction in the example is
C
u
2
+
(
a
q
)
+
Cu^{2 + }(aq) +
C
u
2
+
(
a
q
)
+
2
e
−
→
C
u
(
s
)
2e^ - \rightarrow Cu(s)
2
e
−
→
C
u
(
s
)
.
The anode in an electrochemical cell is the electrode where
oxidation
occurs.
The electrolyte in an electrochemical cell facilitates the flow of ions between the
electrodes
.
Match the component of an electrochemical cell with its process.
Anode ↔️ Oxidation
Cathode ↔️ Reduction
Electrolyte ↔️ Ionic conduction
Arrange the steps in the redox reactions within an electrochemical cell.
1️⃣ Oxidation occurs at the anode, where atoms lose electrons.
2️⃣ Reduction occurs at the cathode, where ions gain electrons.
3️⃣ Electron flow drives the electrical current in the cell.
An electrochemical cell converts chemical energy into electrical energy through redox
reactions
.
What occurs at the anode in an electrochemical cell?
Oxidation
The cathode in an electrochemical cell is the site of
reduction
The electrolyte in an electrochemical cell facilitates
ion
flow.
What is the primary function of the salt bridge in an electrochemical cell?
Maintains electrical neutrality
An electrochemical cell converts chemical energy into
electrical
energy.
Steps in the redox reactions in electrochemical cells
1️⃣ Oxidation occurs at the anode
2️⃣ Atoms lose electrons during oxidation
3️⃣ Reduction occurs at the cathode
4️⃣ Ions gain electrons during reduction
What do redox reactions drive in an electrochemical cell?
Electrical current
Voltaic cells generate electricity through spontaneous
redox
reactions.
Electrolytic cells use electricity to drive non-spontaneous redox
reactions
.
What is the role of electrodes in electrochemical cells?
Conduct electrical current
What is the function of electrolytes in electrochemical cells?
Facilitates ion movement
Match the electrochemical series concept with its description:
Electrode potential ↔️ Measures tendency to lose or gain electrons
Electrochemical series ↔️ Ranks metals by their electrode potentials
What does a more negative electrode potential indicate?
Stronger tendency to oxidize
What is the standard electrode potential of copper?
E
°
=
E° =
E
°
=
+
+
+
0.34
V
0.34 V
0.34
V
A more negative electrode potential indicates a stronger tendency to act as a cathode.
False
What is the standard electrode potential of zinc?
E
°
=
E° =
E
°
=
−
0.76
V
- 0.76 V
−
0.76
V
What occurs at the anode of an electrochemical cell?
Oxidation
The cathode is the electrode where
reduction
occurs.
The electrolyte in an electrochemical cell facilitates the flow of electrons.
False
Match the component with its function in an electrochemical cell:
Anode ↔️ Oxidation site
Cathode ↔️ Reduction site
Electrolyte ↔️ Facilitates ion flow
In a zinc-copper cell, which electrode is the anode?
Zinc
Redox reactions involve the simultaneous processes of oxidation and
reduction
.
What drives the electrical current in an electrochemical cell?
Electron transfer
Match the process with its location and electron activity in a redox reaction:
Oxidation ↔️ Anode, electrons lost
Reduction ↔️ Cathode, electrons gained
What are the two types of electrochemical cells based on energy conversion?
Voltaic and electrolytic
Voltaic cells convert chemical energy into
electrical
energy.
Voltaic cells use spontaneous
redox
reactions to generate electrical current.
What type of energy is required to drive non-spontaneous redox reactions in electrolytic cells?
Electrical energy
In electrochemical cells, electrodes are conductors where oxidation and
reduction
occur.
What does the Electrochemical Series rank metals by?
Electrode potentials
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