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Constructed Response Topic 11: Redox and Electrochemistry
Set D: Redox equation, balancing redox equation, writing half-reaction, anode
Base your answers to questions 9 through 14 on the following redox reaction, which occurs
spontaneously .
3+
2+
Zn + Cr ------- > Zn + Cr
9. State what happens to the number of protons in a 9.
2+
Zn atom when it changes to Zn as the redox
reaction occurs.
10. Which half-reaction occurs at the anode? 10.
Teacher Preview Copy
Teacher Preview Copy
11. Which species loses electrons and which species 11. Lose:
gains electrons?
Gains:
12. Write the half-reaction for the oxidation that occurs. 12.
13. Write the half-reaction for the reduction that occurs. 13.
2+
3+
14. Balance the redox equation using the smallest 14. __Zn + ___ Cr ---- > __ Zn + __ Cr
whole-number coefficients.
Set E: Voltaic cell, half-reaction, cathode
Base your answers to questions 15 through 17 on the diagram of the voltaic cell below.
Half-Cell 1 Half-Cell 2
15. Base on the given equation, write the balance 15.
half-reaction equation for the reaction that
occurs in Half-Cell 1.
16. What acts as the cathode in this voltaic cell? 16.
17. When the switch is closed, state the direction 17.
that electrons will flow though the wire.
408 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Constructed Response Topic 11: Redox and Electrochemistry
Set D: Redox equation, balancing redox equation, writing half-reaction, anode
Base your answers to questions 9 through 14 on the following redox reaction, which occurs
spontaneously .
3+
2+
Zn + Cr ------- > Zn + Cr
9. State what happens to the number of protons in a 9.
2+
Zn atom when it changes to Zn as the redox
reaction occurs.
10. Which half-reaction occurs at the anode? 10.
Teacher Preview Copy
Teacher Preview Copy
11. Which species loses electrons and which species 11. Lose:
gains electrons?
Gains:
12. Write the half-reaction for the oxidation that occurs. 12.
13. Write the half-reaction for the reduction that occurs. 13.
2+
3+
14. Balance the redox equation using the smallest 14. __Zn + ___ Cr ---- > __ Zn + __ Cr
whole-number coefficients.
Set E: Voltaic cell, half-reaction, cathode
Base your answers to questions 15 through 17 on the diagram of the voltaic cell below.
Half-Cell 1 Half-Cell 2
15. Base on the given equation, write the balance 15.
half-reaction equation for the reaction that
occurs in Half-Cell 1.
16. What acts as the cathode in this voltaic cell? 16.
17. When the switch is closed, state the direction 17.
that electrons will flow though the wire.
408 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
