Electrochemistry Concepts and Reactions

The video tutorial covers AP exam questions related to electrochemistry, focusing on half-reactions, reduction potentials, and galvanic cells. It explains the reactions of magnesium and lead, the application of Hess's Law in galvanic cells, and the use of the Nernst equation to determine cell potential under non-standard conditions.

Which element is more likely to be reduced based on their standard reduction potentials?

• Magnesium

• Chromium

• Copper

• Lead

What happens when a magnesium wire is dipped into a solution of lead(II) nitrate?

• Magnesium is reduced

• Lead is oxidized

• A black deposit forms on the wire

• No reaction occurs

Why is lead less reactive than magnesium?

• Magnesium is less reactive

• Lead has a higher reduction potential

• Lead is from the S block

• Lead is more easily oxidized

How can the standard cell potential of a galvanic cell be determined?

• By measuring the current

• By rearranging half-cells and applying Hess's Law

• By using a voltmeter

• By calculating the resistance

What happens to the cell potential when a reaction is flipped?

• It remains the same

• It doubles

• It becomes positive

• It becomes negative

In galvanic cell Y, what process occurs with iron?

• Iron is reduced

• Iron remains unchanged

• Iron forms a precipitate

• Iron is oxidized

What is the effect of increasing the concentration of iron nitrate in cell Y?

• The cell stops functioning

• The voltage increases

• The voltage remains the same

• The voltage decreases

What is the effect of increasing the concentration of iron nitrate in cell Z?

• The voltage increases

• The voltage remains the same

• The voltage decreases

• The cell stops functioning

Which equation is used to determine the voltage under non-standard conditions?

• Nernst Equation

• Hess's Law

• Ohm's Law

• Boyle's Law

What happens to the voltage when the log of a small number is subtracted?

• The voltage becomes zero

• The voltage decreases

• The voltage remains the same

• The voltage increases