Fuel cells work by passing hydrogen through the anode of a fuel cell and oxygen through the cathode. On the anode site, hydrogen molecules are split into electrons and protons. They have a high efficiency therefore these fuel cells are also considered to be very clean plus a fuel cells only by-products are electricity, excess heat, and water.
Answer:
D
Explanation:
exactly one reactant is a solid, and exactly one product is a gas.
The physical process of evaporation involves water and the sun
