Electrochemistry

Voltaic cells convert

• mechanical energy in to electrical energy

• potential energy in to electrical energy

• electrical energy in to chemical energy

• chemical energy in to electrical energy

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

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu^+2?

• Cu   --> Cu⁺²
• Cu + 2 e-   --> Cu⁺²
• Cu  --> Cu⁺²  + 2 e-
• Cu - 2e-  --> Cu⁺²

Tags

NGSS.HS-PS1-2

Reactions in voltaic cells are

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

Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell?

• It prevents the migration of electrons.

• It prevents the reaction from occurring spontaneously.

• It permits the migration of ions.

• It allows for the reaction from occurring spontaneously.

The electrode at which reduction occurs

• cathode
• anode
• salt bridge
• electrode

Tags

NGSS.HS-PS2-5

Which of the following is true for an electrolytic cell?

• changes electrical energy into chemical energy.
• used in electroplating
• uses an electricity to make a nonspontaneous reaction go
• all of the above

Tags

NGSS.HS-PS3-3

Which ion can be most easily oxidized

• copper +2
• zinc +2
• iron +2
• calcium +2

Tags

NGSS.HS-PS1-1

To electroplate an object it would have to be made to be the

• anode
• cathode