What is the main operational difference between a standard battery and a fuel cell?, A fuel cell produces alternating current (AC) instead of direct current (DC)., A battery can only power cars, while a fuel cell can only power spacecraft., A fuel cell never needs to be recharged as long as it has a continuous supply of fuel, A fuel cell stores a larger amount of electricity inside its central core., What happens exactly at the first electrode (the anode)?, Oxygen from the air combines with water to form electricity., Hydrogen molecules split into positive ions (H⁺) and lose their two electrons, Water is split into hydrogen and oxygen through an electrical current., Electrons and positive ions recombine to create a waste byproduct., What is the primary function of the electrolyte (the central polymer membrane)?, It cools down the cell to prevent greenhouse gases from expanding., It channels the unused fuel back to the external circuit., It forces the oxygen molecules to turn into water before entering the cathode., It allows only positive ions to pass through, forcing electrons to take an external route, Why do engineers assemble multiple individual fuel cells into a "stack"?, To prevent the cell from releasing dangerous carbon dioxide during driving., Because a single cell is too large to fit inside the engine of a standard car., Because the amount of electricity produced by each individual cell is very small, To completely stop the production of water as a waste byproduct., What is the main environmental challenge currently associated with hydrogen fuel cells?, They release massive amounts of pollution and greenhouse gases during operation., The only waste product they release when driving is toxic for the environment., The technology cannot be used in modern electric vehicles or spacecraft., The current process to generate and deliver hydrogen fuel is expensive and creates CO₂.

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