Electrochemistry

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

• A
• B
• C
• D

Which statement is correct when the cell produces electricity?

• Magnesium atoms lose electrons
• Mass of the iron electrode decreases.
• Electrons flow from the iron half-cell to the magnesium half-cell.
• Negative ion flow from magnesium half-cell to iron half-cell

Oxidation happens at the

• anode
• cathode
• salt bridge
• voltmeter

Reactions in galvanic/voltaic cells are

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

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

Metal A is more reactive than metal B. Which statement is correct?

• Electrons flow in the external circuit from A to B
• Positive ions flow through salt bridge from A to B
• Positive ions flow in external circuit from B to A.
• Electrons flow through salt bridge from B to A

What is the function of Y in cell below?

• To maintain the excess buildup of charges in the electrolyte

• To allow flow of electrons between both cells
• To allow ions to move from one half cell to the other

• To connect both half cells

Below shows a cell diagram for voltaic cell. Which of the following is FALSE?

• Electrons flow from anode to cathode
• Oxidation happens in anode
• Copper undergo reduction to form copper ions
• Zinc undergo oxidation to form Zinc ions

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