Electrochemical Cells - Chem

Which species is oxidized in the following reaction?

2 Ag⁺(aq) + Cu(s) ⟶ 2 Ag(s) + Cu²⁺(aq)

• Ag

• Ag⁺

• Cu

• Cu²⁺

What happens to the cell voltage when the salt bridge is removed?

• The cell voltage drops to zero.

• The cell voltage increases.

• The cell voltage becomes negative.

• The cell voltage is unchanged.

Tags

NGSS.HS-PS2-5

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

This electrode in a voltaic cell gains mass as the cell operates.

• anode

• cathode

This electrode loses mass as the cell operates.

• anode

• cathode

Which of the following statements correctly describes the movement of electrons in a voltaic cell.

• Electrons flow through the salt bridge from the cathode to the anode

• Electrons flow from left to right as the cell operates.

• Electrons flow through the external wire from the anode to cathode

• Electrons flow from right to left as the cell operates.

Tags

NGSS.HS-PS2-5

Consider the diagram of a voltaic cell represented here. What reaction occurs at the anode?

• Ag⁺ + e^- →Ag

• Ag → Ag⁺ + e^-

• Ni²⁺ + 2e^- → Ni

• Ni → Ni²⁺ + 2e^-

Tags

NGSS.HS-PS1-2

A voltaic cell is established based on the redox reaction below.

Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s)

Which statements are correct as the cell runs? (Select all that apply)

• Magnesium atoms lose electrons.

• The mass of the iron electrode decreases.

• Electrons flow from the iron electrode to the magnesium electrode.

• Anions flow into the iron half-cell.

• Anions flow into the magnesium half-cell.