In an electrochemical cell, oxidation occurs at the anode
What happens at the anode in an electrochemical cell?
Oxidation
Match the half-reactions with their roles in an electrochemical cell:
Oxidation ↔️ Loses electrons
Reduction ↔️ Gains electrons
What does the standard cell potential (E°cell) measure?
Potential difference
The standard cell potential is calculated using the formula: E°cell = E°cathode - E°anode
In a Zn-Cu cell, the zinc electrode acts as the anode
What are the two half-reactions that occur in an electrochemical cell?
Oxidation and reduction
The reducing agent loses electrons during oxidation.
True
Reduction occurs at the cathode
What is the standard cell potential (E°cell) a measure of?
Potential difference between electrodes
Match the term with its definition:
Standard Reduction Potential ↔️ Potential of a half-reaction during reduction
Standard Oxidation Potential ↔️ Negative of the reduction potential
Steps to set up a functional electrochemical cell:
1️⃣ Prepare electrolyte solutions
2️⃣ Connect the electrodes
3️⃣ Link the half-cells with a salt bridge
4️⃣ Connect to a voltmeter
How does the concentration of electrolyte solutions affect the cell voltage?
Changes the standard reduction potentials
Match the variable in the Nernst equation with its meaning:
E ↔️ Actual reduction potential
E°red ↔️ Standard reduction potential
R ↔️ Gas constant
F ↔️ Faraday constant
n ↔️ Number of electrons transferred
Standard reduction potentials depend on the concentration of the reactants and products.
True
The variable 'E' in the Nernst equation represents the actual reduction potential.
True
To investigate the effect of changing concentration on cell voltage, the first step is to set up the electrochemical cell with initial concentrations
How does changing concentrations affect the overall cell potential (E°cell)?
It changes the potential
The standard reduction potentials of half-reactions depend on the concentration of reactants and products.
True
Match the component with its role in an electrochemical cell:
Electrodes ↔️ Provide a surface for oxidation and reduction
Electrolyte ↔️ Contains ions for reactions
Salt bridge ↔️ Maintains electrical neutrality
Oxidation occurs at the anode, where a reducing agent loses electrons and is oxidized
What is the role of the salt bridge in an electrochemical cell?
Maintain electrical neutrality
The standard cell potential (E°cell) is calculated using the standard electrode potentials
In a zinc-copper electrochemical cell, what is the oxidation potential of zinc (Zn)?
+0.76 V
What is the standard cell potential measured under standard conditions?
298 K and 1 atm
The standard reduction potential is the potential of a half-reaction when it occurs as a reduction.
True
Steps to set up an electrochemical cell:
1️⃣ Choose appropriate electrodes
2️⃣ Select suitable electrolytes
3️⃣ Connect electrodes and electrolytes in half-cells
4️⃣ Use a salt bridge
To measure the cell voltage with a voltmeter, connect the positive terminal to the cathode.
True
The Nernst equation relates the actual reduction potential to the standard reduction potential, temperature, and the ratio of oxidized and reduced species
In the Nernst equation, 'n' represents the number of electrons transferred in the half-reaction.
True
What is the general effect of increasing electrolyte concentration on cell voltage?
Increases cell voltage
The electrochemical series arranges metals based on their standard electrode potentials.
True
What should experimental results be compared with to validate the design and identify discrepancies?
Standard electrode potentials
What is the primary purpose of electrochemical cells?
Generate electrical energy
Electrochemical cells generate electrical energy from chemical reactions
Match the components of an electrochemical cell with their roles:
Electrodes ↔️ Provide a surface for oxidation and reduction reactions
Electrolyte ↔️ Contains ions that can be oxidized or reduced
Salt bridge ↔️ Maintains electrical neutrality by allowing ion flow
What is an example of an electrolyte used in an electrochemical cell?
Zinc sulphate solution
The salt bridge in an electrochemical cell prevents electrical neutrality.
False
Steps involved in the operation of an electrochemical cell:
1️⃣ Oxidation occurs at the anode
2️⃣ Reduction occurs at the cathode
3️⃣ Electrons flow from anode to cathode
4️⃣ Ions flow through the salt bridge
Oxidation occurs at the anode, where a reducing agent loses electrons