Unit 8

If a half-cell does not involve metal atoms or ions, what can you use to complete the circuit?

• Carbon nanotube

• Carbon rod

• Diamonds

The circuit must be complete for the electrons to flow.

• True

• False

Atoms of which element can most easily be oxidized?

• Copper
• Zinc
• Iron
• Calcium

Tags

NGSS.HS-PS1-2

A galvanic cell is established to power a torch, as shown.
For this cell, the overall equation will be

• 2Al(s)+3H_2(g)→2Al³⁺(aq)+6H⁺(aq)
• 3Cl^-(aq)+Al(s)→AlCl₃(aq)
• 2Al³⁺(aq)+3H_2(g)→2Al(s)+6H⁺(aq)
• 2Al(s)+6H⁺(aq)→2Al³⁺(aq)+3H₂(g)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

NGSS.HS-PS2-5

The electrolysis of molten sodium chloride produces:

• hydrochloric acid
• sodium metal and chlorine gas
• chlorine gas and aqueous sodium hydroxide
• glucose

Which of the following is not a similarity between voltaic and electrolytic cells?

• electrons flow from anode to cathode
• reduction occurs at cathode
• oxidation occurs at anode
• charges on anode and cathode are the same

Which ion can be most easily reduced?

• Copper +2
• Zinc +2
• Iron +2
• Calcium +2

The net cell reaction in a particular galvanic cell is:
Cu²⁺(aq)  +  Sn²⁺(aq) →  Cu(s)  +  Sn⁴⁺(aq)
In this cell, we would expect to observe: 

• crystals of copper forming on the anode.
• the cathode corroding away. 
• the solution in the copper half-cell becoming lighter in color.
•  the voltmeter needle showing that the copper electrode has negative polarity.

Where does oxidation occur?

• Cathode

• Anode

• Electrode

In the electrolysis of molten sodium chloride sodium metal is produced at the 

• anode
• cathode