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- 1. Multiple Choice
Given the equation:
2 Al + 3 Cu2+ → 2 Al3+ + 3 Cu
The reduction half-reaction is
Al → Al3+ + 3e–
Al + 3e– → Al3+
Cu2+ + 2e– → Cu
Cu2+ → Cu + 2e–
- 2. Multiple Choice
Given the reaction for the corrosion of aluminum:
4 Al + 3 O2 → 2 Al2O3
Which half-reaction correctly represents the oxidation that occurs?
Al + 3e– → Al3+
Al → Al3+ + 3e–
O2 + 4e– → 2 O2–
O2 → 2 O2– + 4e-
- 3. Multiple Choice
Which half-reaction correctly represents reduction?
Ag → Ag+ + e–
F2 → 2 F– + 2e–
Au3+ + 3e–→ Au
Fe2++ e– → Fe3+
- 4. Multiple Choice
Half-reactions can be written to represent all
double-replacement reactions
neutralization reactions
fission and fusion reactions
oxidation and reduction reactions
- 5. Multiple Choice
Which half-reaction shows conservation of charge?
Cu + e– → Cu+
Cu+ → Cu + e–
Cu2+ + 2e– → Cu
Cu2+ → Cu + 2e–
- 6. Multiple Choice
Which half-reaction equation represents the reduction of a potassium ion?
K+ + e– → K
K + e– → K+
K+ → K + e–
K → K+ + e–
- 7. Multiple Choice
Which half-reaction correctly represents reduction?
Mn4+ → Mn3+ + e–
Mn4+ → Mn7+ + 3e–
Mn4+ + e– → Mn3+
Mn4+ + 3e– → Mn7+
- 8. Multiple Choice
Given the balanced ionic equation representing a reaction:
2Al(s) + 3Cu2+(aq) → 2Al3+(aq) + 3Cu(s)
Which half-reaction represents the reduction that occurs?
Al → Al3+ + 3e-
Al3+ + 3e- → Al
Cu → Cu2+ + 2e-
Cu2+ + 2e- → Cu
- 9. Multiple ChoiceAnother name for a "oxidation-reduction" reaction ischemical reactionneutralization reactionredox reactionnuclear reaction
- 10. Multiple Choice
Oxidation is the _________ of electrons.
loss
gain
sharing
transfer
- 11. Multiple Choice
Reduction is the ___________ of electrons.
loss
gain
sharing
transfer
- 12. Multiple ChoiceWhich statement is true:
Mg → Mg2+ + 2e–Mg gains 2 electronsMg2+ loses 2 electronsMg loses 1 electronMg loses 2 electrons - 13. Multiple ChoiceIn the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________ReducedSynthesizedOxidizedNone of the above - 14. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 15. Multiple Choice
Cl2 + 2e- --> 2Cl - is an example of:
a chemical reaction
redox
oxidation
reduction
- Answer choicesTagsAnswer choicesTags