Exam 10: Energy From Electron Transfer

Early chemists (well, Neolithic metals workers actually!) discovered that carbon, such as coal or charcoal, could be used to convert metal salts into metals. What was the role of the carbon in this process?

Which statement best describes the positively charged location on a battery?

For the following reaction involving the smelting of iron ore, the carbon is __________ . 2 Fe₂O_3(s) + 3 C_(s)  4 Fe_(l) + 3 CO_{2 (g)}

Which statement best describes the potential energy and electrical properties of bursts of electricity like lightning?

For the following reaction involving the smelting of iron ore, the carbon in the starting materials __________ . 2 Fe₂O_3(s) + 3 C_(s)  4 Fe_(l) + 3 CO_{2 (g)}

Photovoltaic solar methods take advantage of solar energy to ________ .

For the following reaction involving the smelting of iron ore, the carbon dioxide in the product __________ . 2 Fe₂O_3(s) + 3 C_(s)  4 Fe_(l) + 3 CO_{2 (g)}

Fuel Cells are attractive for many reasons, but which of the following is considered one of the major disadvantage when dealing with fuel cells?

The role of the reducing agent is to ______ .

What quantity is used to measure the electrical potential energy that supplies the impetus to move electrons between the anode and cathode?

In the discoloration of cut fruit, such as apples, what is the most likely oxidant that is causing the discoloration?

Silicon, with 4 valence electrons, is the most widely used material for photovoltaic devices even though it is only a semiconductor. You can improve the conductivity with dopants. Which of these elements would best serve to create an n-type semiconductor when added to silicon?

Which statement best describes the salt bridge within a galvanic cell?

Determine the oxidation state of the metal below: TiO₂

Determine the oxidation state of the metal below: FeSO₄

How is electrolysis different than typical redox reactions such as those found in corrosion and batteries?

What is the main characteristic of a free-radical?

For the Hydrogen/Oxygen fuel-cell, the two half reactions of which are shown below, the oxidant is found ___________ . Reaction A 2 H₂ + 4 OH^- -----> 4 H₂O + 4 e^- Reaction B O₂ + 2 H₂O + 4 e^- -----> 4 OH ^-

If your galvanic cell was designed with salt bridge that only allowed negative ions to flow through it, similar to what is found in some high temperature fuel-cells, during discharge you would expect ___________ .

What is the relationship between the industrial production of metal from ores and the process of corrosion?