Every chemical reaction involves a change in energy because different substances hold different amounts of energy. During the reaction, bonds inside the substances that are reacting together must ...

1 Write the balanced chemical equation for the reaction ... react to form hydrogen chloride gas. What is the energy change of this reaction? Use the bond energies in the table to calculate ...

Do not attempt to perform this demonstration. The combustion of methane is an example of an exothermic reaction. More energy is released when the bonds in the products are formed than is used to break ...