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Chemical reactions involve the transformation of one set of chemical substances into another as a result of making or breaking of chemical bonds. This process is fundamental to many sustainable energy technologies, including those that generate power from fuel cells and solar panels. In fuel cells, chemical reactions are used to convert fuels like hydrogen directly into electricity, water, and heat without combustion. Similarly, in solar cells, chemical reactions enable the conversion of sunlight into electrical energy through a process called photovoltaics. By understanding the principles of chemical reactions and their applications in sustainable energy systems, scientists and engineers can develop more efficient and eco-friendly technologies to meet the world's growing energy demands.