Voltaic Cell Day #2

Which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

• Cu(s) + Zn(s) → Cu²⁺(aq) + Zn²⁺(aq)

• Cu²⁺(aq) + Zn(s) → Cu(s) + Zn²⁺(aq)

• Cu(s) + Zn²⁺(aq) → Cu²⁺(aq) + Zn(s)

• Cu²⁺(aq) + Zn²⁺(aq) → Cu(s) + Zn(s)

Tags

NGSS.HS-PS3-5

Given the balanced ionic equation representing the reaction in an operating voltaic cell:

Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)

The flow of electrons through the external circuit in this cell is from the

• Zn anode to the Cu cathode

• Cu anode to the Zn cathode

• Cu cathode to the Zn anode

• Zn cathode to the Cu anode

Which change occurs at the anode in an operating electrochemical cell?

• gain of electrons

• gain of protons

• loss of protons

• loss of electrons

In an operating voltaic cell, reduction occurs

• at the anode

• at the cathode

• in the salt bridge

• in the wire

Which half-reaction can occur at the anode in a voltaic cell?

• Sn + 2e^- → Sn²⁺

• Zn → Zn²⁺ + 2e^-

• Fe³⁺ → Fe²⁺ + e^-

• Ni²⁺ + 2e^- → Ni

Tags

NGSS.HS-PS1-2

A student collects the materials and equipment below to construct a voltaic cell:

• - two 250-mL beakers

• - wire and a switch

• - one strip of magnesium

• - one strip of copper

• -125 mL of 0.20 M Mg(NO3)2(aq)

• - 125 mL of 0.20 M Cu(NO3)2(aq).

• Which additional item is required for the construction of the voltaic cell?

• a cathode

• a salt bridge

• a battery

• an anode

The diagram and ionic equation below represent an operating voltaic cell. Which phrase describes the direction of electron flow in this cell?

• from Mg(s) through the wire to Ni(s)

• from Ni(s) through the wire to Mg(s)

• from Mg²⁺(aq) ions through the salt bridge to Ni²⁺(aq) ions

• from Ni²⁺(aq) ions through the salt bridge to Mg²⁺(aq) ions

Tags

NGSS.HS-PS2-5

State what happens to the mass of the Cu electrode and the mass of the Zn electrode in the operating cell.

Answer explanation

— Cu electrode :

mass increases

—Zn electrode : mass

decreases

Write a balanced equation for the half-reaction that occurs in the Cu half-cell when the cell operates.

Answer explanation

See image attached

Tags

NGSS.HS-PS1-2

Which energy conversion occurs in an operating voltaic cell?

• electrical energy to nuclear energy

• chemical energy to nuclear energy

• electrical energy to chemical energy

• chemical energy to electrical energy