Question

Choose the options below that are not true of fuel cells. (select all that apply)select all that apply:

a. fuel cells convert electrical energy to chemical energy.
b. hydrogen fuel cells eventually run out of reagents.
d. hydrogen fuel cells produce only water as exhaust e. fuel cells convert chemical energy into electrical energy.

Answer 1

Fuel cells convert chemical energy into electrical energy by utilizing a redox combustion reaction. They produce water as the only exhaust.

Step-by-step explanation:

Fuel cells are devices that convert chemical energy into electrical energy. They function by utilizing a redox combustion reaction, where the cathode reactant is typically air or pure oxygen and the anode fuel is a gas such as hydrogen. Fuel cells require a continuous supply of reactants and continuously remove the resulting products. In the case of a hydrogen fuel cell, the reaction produces water as the only exhaust.

Therefore, the option that is not true of fuel cells is: a. Fuel cells convert electrical energy to chemical energy. Fuel cells actually convert chemical energy into electrical energy.

Answer 2

The correct options based on the provided choices are:

a. Fuel cells convert electrical energy to chemical energy.

b. Hydrogen fuel cells eventually run out of reagents.

Fuel cells are devices that convert chemical energy directly into electrical energy through an electrochemical reaction. Contrary to statement a, they do not convert electrical energy into chemical energy but rather harness energy from a chemical reaction to produce electricity.

Regarding statement b, if continuously supplied with fuel (such as hydrogen) and an oxidizing agent (like oxygen), fuel cells can operate continuously without running out of reagents, as they facilitate a continuous electrochemical process.