Electrochem

Electrons always flow from

• cathode to anode

• anode to cathode

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Oxidation occurs at the

• anode

• cathode

Electrons are gained at the

• anode

• cathode

Given their standard reduction potentials, which of the species is going to be oxidized?

Cu²⁺/Cu = 0.34V

Zn²⁺/Zn = -0.76V

• Cu

• Zn

• CuSO4

• ZnSO4

Tags

NGSS.HS-PS1-2

An iron nail is put into a solution of copper nitrate, iron is above copper in the activity series of metals, what will happen?

• iron will be reduced
• bubbles of oxygen gas will form on iron nail
• the iron nail will become copper plated
• no reaction occurs

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What occurs to the mass of copper electrode in the following reaction?

Zn/Zn²⁺ // Cu²⁺/Cu

• increases

• decreases

• remains the same

Tags

NGSS.HS-PS1-7

Which of the following statements applies to the change in mass of the electrodes involved in this electrochemical cell?

• Electrode A is the anode and it gains mass

  since metal ions are being converted to metal

  atoms which often adhere to the electrode.

• Electrode B is the anode and it gains mass

  since metal ions are being converted to metal

  atoms which often adhere to the electrode.

• Electrode A is the cathode and it gains mass since metal ions are being converted to metal atoms which often adhere to the electrode.

• Electrode B is the cathode and it gains mass since metal ions are

  being converted to metal atoms which often adhere to the electrode.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which of the following best describes this electrochemical cell?

• Electrode A is the anode since anions are present in its half-cell and the current flows from cathode to anode.

• Electrode C is the cathode since cations are present in its half-cell and the current flows from anode to cathode.

• Electrode A is the anode and Electrode C is the cathode since the current always flows from cathode to anode.

• Electrode C is the anode and Electrode A is the cathode since the current always flows from anode to cathode.

Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na

• Li
• Na
• O
• H

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which bulb in the following circuits will light up?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5