Exam 11: Oxidations and Reductions Charge the World

Iron atoms, Fe, are better reducing agents than copper ions, . In which direction do electrons flow when an iron nail is submerged in a solution of ions?

Why is oxygen usually an oxidizing agent?

Which of the following species is undergoing oxidation? 2 CuBr → 2Cu + Br₂

How are photovoltaic cells different from many other forms of solar energy?

A fuel cell produces electrical energy from ________.

When you have p-type silicon and n-type silicon joined together, why don't electrons dislodged by light in the n-type cross the junction barrier and enter the p-type?

Why might coating a metal with another metal that is harder to oxidize prevent the first metal from being oxidized?

The n-type/p-type junction is like ________.

Why does a small amount of carbon strengthen iron?

In a metal-containing compound, the metal exists as a ________.

How many electrons are gained or lost in the following half-reaction? Na → Na⁺

How does connecting a metal like iron with a wire to a metal that is easier to oxidize like zinc help prevent corrosion of the iron?

Which of the following materials is most likely to act as a reducing agent?

A chemical equation for the combustion of propane, C₃H₈, is shown below. Through this reaction is the carbon oxidized or reduced? + 5 → 3 + 4 O

In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn²⁺ + 2e^- Rxn B: 2 NH₄⁺ + 2e^- → 2 NH₃ + H₂ Which reaction is taking place at the anode?

In the above diagram, which atom behaves as the oxidizing agent, the lighter colored atom or the darker colored atom?

Upon entering the body, are drugs gradually oxidized or reduced?

How does n-type silicon differ from pure silicon?

Your car lights were left on while you were shopping, and now your car battery is dead. Has the pH of the battery fluid increased or decreased?

Which of the following statements about oxidation and reduction reactions is true?