Describe how to balance a redox reaction for an acidic vs a basic environment.
Chapter 20: Electrochemistry

Passage
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Chemistry
•
University
•
Hard
Kyla Cymone
Used 1+ times
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19 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
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Answer explanation
To balance a redox reaction:
Split the reaction into two half-reactions – one for oxidation and one for reduction.
Balance all elements except hydrogen and oxygen in each half-reaction.
Balance oxygen atoms by adding H₂O.
Balance hydrogen atoms:
In acidic solution, add H⁺.
In basic solution, still add H⁺ for now; you’ll adjust this later.
Balance the charges by adding electrons (e⁻) to the more positive side of each half-reaction.
Make the number of electrons equal in both half-reactions by multiplying one or both reactions by a coefficient if needed.
Add the two half-reactions together and cancel out species that appear on both sides (e.g., electrons, H⁺, H₂O).
For acidic solution, the reaction is now balanced.
For basic solution, take the balanced acidic equation and:
Add the same number of OH⁻ ions as H⁺ ions to both sides of the equation.
Combine H⁺ and OH⁻ on the same side to form H₂O.
Cancel out any extra H₂O molecules that appear on both sides.
Double-check that:
All atoms are balanced.
The net charge on both sides is the same.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of a galvanic (voltaic) cell?
To convert electrical energy into chemical energy
To convert chemical energy into electrical energy
To store electrical energy for later use
To neutralize acids and bases
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a galvanic cell, where does oxidation occur?
At the cathode
In the salt bridge
At the anode
In the external circuit
4.
MATCH QUESTION
1 min • 1 pt
Match each term about the voltaic cell to its definition.
Anode
Allows ion flow to maintain electrical neutrality between half-cells.
Salt Bridge
Electrode where reduction occurs; gains electrons.
Cathode
Pathway through which electrons flow from anode to cathode.
External Circuit
Electrode where oxidation occurs; loses electrons.
Answer explanation
5.
DROPDOWN QUESTION
1 min • 1 pt
In a voltaic cell, electrons move from (a) to (b) through the external circuit.
6.
DROPDOWN QUESTION
1 min • 1 pt
(a) is the gain of electrons, while (b) is the loss of electrons.
In the zinc and copper voltage cell example, the reduction occurs on the (c) side, while the oxidation occurs on the (d) side.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role does the salt bridge play in a galvanic cell?
It generates electrons for the circuit
It prevents the flow of ions between half-cells
It allows the flow of electrons between electrodes
It maintains electrical neutrality by allowing ion flow
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