Science 20 Unit A Lesson 2.4-2.5 Quiz

In a voltaic cell, the anode is:

• positive

• negative

In a voltaic cell, the cathode is:

• positive

• negative

In a voltaic cell, oxidation occurs at the:

• anode

• cathode

In a voltaic cell, reduction occurs at the:

• anode

• cathode

In a voltaic cell, electrons flow from the:

• anode to the cathode

• cathode to the anode

In this voltaic cell, which electrode is undergoing reduction?

• Cu | Cu²⁺

• Zn | Zn²⁺

What reaction occurs at the anode?

• Ag⁺ (aq) + e^- →Ag (s)

• Ag (s) → Ag⁺ (aq) + e^-

• Ni²⁺ (aq) + 2e^- → Ni (s)

• Ni (s) → Ni²⁺ (aq) + 2e^-

Answer explanation

Oxidation happens at anode.

Metal A is more reactive than metal B. Which statement is correct?

• Electrons flow in the external circuit from A to B

• Positive ions flow through salt bridge from A to B

• Positive ions flow in external circuit from B to A

• Electrons flow through salt bridge from B to A

Which half-reaction correctly represents reduction?

• Ag → Ag⁺ + e^-

• F₂ → 2F^- + 2e^-

• Au³⁺ + 3e^- → Au

• Fe²⁺ + e^- → Fe³⁺

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer