Redox Review

A voltaic cell differs from an electrolytic cell in that in a voltaic cell

• energy is produced when the reaction occurs

• energy is required for the reaction to occur

• both oxidation and reduction occur

• neither oxidation nor reduction occurs

Tags

NGSS.HS-PS1-4

Which half-reaction correctly represents reduction?

• Ag --> Ag⁺ + e^-

• F₂ --> 2 F^- + 2e^-

• Au³⁺ + 3e^- --> Au

• Fe²⁺ + e^- --> Fe³⁺

Which reaction is an example of an oxidation-reduction reaction?

• AgNO₃ + KI --> AgI + KNO₃

• Cu + 2 AgNO₃ --> Cu(NO₃)₂ + 2 Ag

• 2 KOH + H₂SO₄ -> K₂SO₄ + 2 H₂O

• Ba(OH)2 + 2 HCl --> BaCl2 + 2 H2O

Which metal reacts spontaneously with a solution containing zinc ions?

• magnesium

• nickel

• copper

• silver

In any redox reaction, the substance that undergoes reduction will

• lose electrons and have a decrease in oxidation number

• lose electrons and have an increase in oxidation number

• gain electrons and have a decrease in oxidation number

• gain electrons and have an increase in oxidation number

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As a Ca atom undergoes oxidation to Ca²⁺, the number of neutrons in its nucleus

• decreases

• increases

• remains the same

Tags

NGSS.HS-PS1-8

Which half-reaction occurs at the cathode?

• Combustion

• Oxidation

• Reduction

• All of the above

The diagram shows a method used to electroplate a key with copper.     Which aqueous solution is most suitable for the electrolyte?  

• copper(II) sulphate 
• ethanol 
• sodium hydroxide 
• sulphuric acid

Tags

NGSS.HS-PS2-5

This is the half reaction for: 
Sn(s) → Sn⁴⁺(aq) + 4e⁻

• redox
• reduction
• oxidation
• neutralization

What is the oxidation number of carbon in NaHCO3?

• +1
• +4
• -4
• +6