Question

which of the following statement(s) describe(s) an exothermic reaction? check all that apply. the bonds in the reactants are stronger than the bonds in the products. the energy of the reactants is lower than the energy of the products. energy is absorbed in the reaction. δh is a negative value. none of the above

Explanation:

• In an exothermic reaction, energy is released. When the bonds in reactants are stronger than those in products, more energy is released during bond - formation in products than is absorbed during bond - breaking in reactants.
• The enthalpy change \(\Delta H=H_{products}-H_{reactants}\). For exothermic reactions, \(H_{reactants}>H_{products}\), so \(\Delta H < 0\).
• If the energy of reactants is lower than that of products (\(H_{reactants}0\) (endothermic). And if energy is absorbed, it is an endothermic reaction.

Answer:

• The bonds in the reactants are stronger than the bonds in the products.
• \(\Delta H\) is a negative value.