Galvanic Cell

Which energy conversion shown below takes place in a galvanic cell?

• Electrical to chemical

• Mechanical to chemical

• Mechanical to electrical

• Chemical to electrical

Answer explanation

Chemical reactions in the electrolyte generate electric current. This can be observed from the deflection of voltmeter needle

In a Galvanic Cell, the anode is the (a)   terminal.

In the above Galvanic Cell, which half cell is undergoing reduction?

• Cu | Cu²⁺

• Zn | Zn²⁺

Answer explanation

Copper is the less electropositive metal compared to Zinc. Thus, Reduction take place whereby Cu²⁺ ions are converted to Cu

E_cell = E_cathode - E_anode. Is this equation true or false?

• True

• False

Answer explanation

Kakak tolak adik. Remember ya :)

What is the main difference between galvanic cells and electrolytic cells?

• Galvanic cells require an external power source, while electrolytic cells do not.

• Electrolytic cells require an external power source, while galvanic cells do not.

• Galvanic cells can only operate under acidic conditions.

• Electrolytic cells can only operate under basic conditions.

Tags

NGSS.HS-PS3-5

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

Answer explanation

More reactive means more electropositive. This Metal A will undergo oxidation which releases electron. This electron moves through the external circuit and reaches metal B

Tags

NGSS.HS-PS1-2

Which changes could take place at positive electrode in a voltaic cell?

• I and II

• I and III

• II and III

• I, II and III

Answer explanation

The positive electrode in a Voltaic Cell is cathode. Therefore, Reduction takes place. Reduction is decrease in oxidation number.

Tags

NGSS.HS-PS1-2

Below shows a cell diagram for voltaic cell. Which of the following is FALSE?

• Electrons flow from anode to cathode

• Oxidation happens in anode

• Copper undergo reduction to form copper ions

• Zinc undergo oxidation to form Zinc ions

Answer explanation

It should be Copper ions undergo reduction to form copper.

Tags

NGSS.HS-PS1-7

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag

• Ag → Ag⁺ + e^-

• Ni²⁺ + 2e^- → Ni

• Ni → Ni²⁺ + 2e^-

Answer explanation

Oxidation happens at anode.

Tags

NGSS.HS-PS1-2

Given the cell notation

Cu(s)|Cu²⁺(aq) || Ag⁺(aq)|Ag(s)

what is the half-reaction that occurs at the anode ?

• Cu²⁺(aq) + 2e^– ⟶ Cu(s)

• Cu(s) ⟶ Cu²⁺(aq) + 2e^–

• Ag⁺(aq) + e^– ⟶ Ag(s)

• 2Ag⁺(aq) + Cu(s)⟶ Cu²⁺(aq) + 2Ag (s)

Answer explanation

Remember format A B C for cell notation. Therefore, the first part is anode and oxidation occurs at anode.