Voltaic Cells

Electrons flow from _____ to _____.

• electrode; anode

• cathode; anode

• anode; cathode

• cathode; electrode

Tags

NGSS.HS-PS2-5

What happens at the cathode?

• neutralize e^-

• gain e^-

• lose e^-

• nothing

Tags

NGSS.HS-PS2-5

What is the purpose of a salt bridge in a voltaic cell?

• gain e^-

• lose e^-

• nothing

• to balance charges

Cu(s)|Cu²⁺(aq)||Ag⁺(aq)|Ag(s)

What happens at the cathode?

• Cu(s) → Cu²⁺(aq) + 2e^-

• Cu²⁺(aq) + 2e^- → Cu(s)

• Ag(s) → Ag⁺(aq) + e^-

• Ag⁺(aq) + e^- → Ag(s)

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

In a salt bridge, negative anions go to the _____.

• anode

• electrode

• cathode

• not enough information

Anode is _____.

• not enough information

• reduction

• oxidation

• electrolysis

For a spontaneous reaction, E°_cell __ 0

• <

• =

• >

• not enough information

Which equation represents an oxidation half-reaction?

• Zn(s) → Zn²⁺(aq) + 2e^-

• Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)

• Cu²⁺(aq) + 2e^- → Cu(s)

• Zn²⁺(aq) → Zn(s) +2e^-