Redox Review

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

What is the oxidation number of nitrogen in N₂?

• -3

• 0

• +4

• -1

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons
• Mg_²⁺ loses 2 electrons
• Mg loses 1 electron
• Mg loses 2 electrons

If in a reaction, copper is reduced; its number of electrons has:

• Increased
• Decreased
• Remained Constant
• Varies Randomly

Reduction happens at the 

• anode
• cathode
• salt bridge
• voltmeter

This electrode loses mass 

• anode
• cathode

Which energy conversion shown below takes place in a voltaic cell?

• Electrical to chemical

• Mechanical to chemical

• Mechanical to electrical

• Chemical to electrical

In a voltaic cell the ions flow through the 

• wire
• salt bridge

In a voltaic cell electrons flow

• through the salt bridge
• from the cathode to the anode through the wire
• from the anode to the cathode through the wire