Electrochemistry

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced
• Synthesized
• Oxidized
• None of the above

What is the oxidation number of Fe in FeO?

• +1
• -1
• +2
• -2

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

Which change does nitrogen undergo oxidation?

• A
• B
• C
• D

Reduction happens at the 

• anode
• cathode
• salt bridge
• voltmeter

Oxidation happens at the

• anode
• cathode
• salt bridge
• voltmeter

Reactions in voltaic cells are

• spontaneous, redox reactions
• non-spontaneous, redox reactions
• spontaneous, non-redox reactions
• non-spontaneous, non-redox reactions

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag
• Ag → Ag⁺ + e^-
• Ni²⁺ + 2e^- → Ni
• Ni → Ni²⁺ + 2e^-

In which direction does electricity flow in a voltaic cell (battery)?

• Electrons flow from the cathode to the anode
• Electrons flow from left to right
• Electrons flow from anode to cathode
• Electrons flow from right to left

Which direction do the electrons flow in wire X and which metal is oxidized?

• A
• B
• C
• D