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Topic 11: Redox and electrochemistry
21. Voltaic cells: Interpreting voltaic cell diagram
Answer questions 1 - 10 based on the cell diagram below.
Teacher Preview Copy
Teacher Preview Copy
1. When the switch is closed, the species oxidized is 3) Pb(s) 4) Cu(s)
2+
2+
1) Cu (aq)
2) Pb (aq)
2. The oxidizing agent in this reaction is 2+ 2+
1) Pb(s) 2) Cu(s) 3) Pb (aq) 4) Cu (aq)
3. The anode in this electrochemical cell is the
1) Cu atom, which is the positive electrode 3) Pb atom, which is the positive electrode
2) Cu atom, which is the negative electrode
4) Pb atom, which is the negative electrode
4. The cathode in this electrochemical cell is the
1) Cu atom, where electrons will be gained 3) Pb atom, where electrons will be gained
4) Pb atom, where electrons will be lost
2) Cu atom, where electrons will be lost
5. When the switch is closed, reduction will occur at the
1) Anode, which is the positive electrode 3) Cathode, which is the positive electrode
2) Anode, which is the negative electrode
4) Cathode, which is the negative electrode
6. The salt bridge in the electrochemical diagram will connects
2+
3) Pb ions to Cu atom
1) Pb atom to Cu atom
2) Pb ion to Cu ion 4) Cu ions to Pb atom
2+
2+
2+
7. As the reaction occurs, the flow of electrons will be from
2+
2+
1) Pb to Cu
3) Cu to Pb
2) Pb to Cu 4) Cu to Pb
2+
8. Which half-reaction equation correctly represents what occurs at the anode of this cell?
-
-
2+
2+
1) Pb -------------- Pb + 2e
3) Cu ------------ Cu + 2e
2+
-
-
2+
2) Pb + 2e ----------- Pb 4) Cu + 2e ----------- Cu
9. Which correctly shows the half-reaction that occurs at the cathode of this cell?
1) Pb + 2e ----------- Pb 3) Cu + 2e ----------- Cu
-
2+
2+
-
2+
-
2+
-
2) Pb + 2e ------------ Pb 4) Cu + 2e ---------- Cu
10. Which is true in this electrochemical cell when the switch is closed?
1) The mass of Cu will decrease 3) The mass of Pb will remain the same
2) The mass of Pb will decrease 4) The mass of Cu will remain the same
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 333
Topic 11: Redox and electrochemistry
21. Voltaic cells: Interpreting voltaic cell diagram
Answer questions 1 - 10 based on the cell diagram below.
Teacher Preview Copy
Teacher Preview Copy
1. When the switch is closed, the species oxidized is 3) Pb(s) 4) Cu(s)
2+
2+
1) Cu (aq)
2) Pb (aq)
2. The oxidizing agent in this reaction is 2+ 2+
1) Pb(s) 2) Cu(s) 3) Pb (aq) 4) Cu (aq)
3. The anode in this electrochemical cell is the
1) Cu atom, which is the positive electrode 3) Pb atom, which is the positive electrode
2) Cu atom, which is the negative electrode
4) Pb atom, which is the negative electrode
4. The cathode in this electrochemical cell is the
1) Cu atom, where electrons will be gained 3) Pb atom, where electrons will be gained
4) Pb atom, where electrons will be lost
2) Cu atom, where electrons will be lost
5. When the switch is closed, reduction will occur at the
1) Anode, which is the positive electrode 3) Cathode, which is the positive electrode
2) Anode, which is the negative electrode
4) Cathode, which is the negative electrode
6. The salt bridge in the electrochemical diagram will connects
2+
3) Pb ions to Cu atom
1) Pb atom to Cu atom
2) Pb ion to Cu ion 4) Cu ions to Pb atom
2+
2+
2+
7. As the reaction occurs, the flow of electrons will be from
2+
2+
1) Pb to Cu
3) Cu to Pb
2) Pb to Cu 4) Cu to Pb
2+
8. Which half-reaction equation correctly represents what occurs at the anode of this cell?
-
-
2+
2+
1) Pb -------------- Pb + 2e
3) Cu ------------ Cu + 2e
2+
-
-
2+
2) Pb + 2e ----------- Pb 4) Cu + 2e ----------- Cu
9. Which correctly shows the half-reaction that occurs at the cathode of this cell?
1) Pb + 2e ----------- Pb 3) Cu + 2e ----------- Cu
-
2+
2+
-
2+
-
2+
-
2) Pb + 2e ------------ Pb 4) Cu + 2e ---------- Cu
10. Which is true in this electrochemical cell when the switch is closed?
1) The mass of Cu will decrease 3) The mass of Pb will remain the same
2) The mass of Pb will decrease 4) The mass of Cu will remain the same
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 333
