Work will continue because differences in energy will continue. Chemical reactions become increasingly more endergonic. All energy will be disposed of evenly as heat. An unlit firecracker 4. Reactants and products possess equal amounts of energy.
Energy is stored by the reactions.
Catalysts are required. Photosynthesis do not comply with the physical laws of the universe. Because sugar has less energy than the sun. Chemically protein catalysts are not needed. Biological catalysts are specific enzymes.