The reaction is exothermic. If the answer is positive, the reaction is endothermic. Hydrogen and chlorine react to form hydrogen chloride gas. What is the energy change of this reaction?

or chlorine dioxide may serve as oxidants. Most fuel cells in use today, however, use hydrogen and oxygen as the chemicals. In the future, fuel cells could power our cars, with hydrogen replacing ...

Burning fossil fuels has led to a global energy crisis, worsening pollution and climate change. To tackle this problem, we ...