redox review

Oxidation is when

• electrons are gained

• protons are greater than electrons

• electrons are lost

• protons are less than electrons

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 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

In the spaces provided, or a separate sheet of paper, balance the equation using the smallest whole-number coefficients.

• 3, 2, 3, 2

• 1, 3, 2, 1

• 1, 1, 1, 1

• 2, 3, 2, 3

Tags

NGSS.HS-PS1-7

Which component of an electrochemical cell is correctly paired with its function?

• external conductor -- allows the solutions to mix

• external conductor -- permits the migration of ions

• salt bridge -- allows the solutions to mix

• salt bridge -- permits the migration of ions

Tags

NGSS.HS-PS2-5

Which half-reaction occurs at the cathode?

• Combustion

• Oxidation

• Reduction

• All of the above

The diagram shows an electric heater. Which method would be used to plate the chromium on to the steel?

• alloying
• electrolysis
• galvanizing  
• oxidation  

Tags

NGSS.HS-ETS1-3