This option is correct because energy changes in chemical reactions often occur when new chemical bonds are formed. When new bonds are created, energy may be released, resulting in an exothermic reaction.
Conversely, energy is required to break existing chemical bonds in reactant molecules. Breaking bonds requires an input of energy because it disrupts the stable arrangement of atoms in the reactants.
Most chemical reactions involve both bond formation and bond breakage. Some bonds are broken in the reactants, while new bonds are formed in the products. This combination of bond formation and breakage leads to overall energy changes in chemical reactions.
Ionic bonds are a specific type of chemical bond formed between ions of opposite charges. They are not the primary reason for energy changes in chemical reactions, although the formation or breaking of ionic bonds can contribute to the overall energy change.
A. Bond formation: This option is correct because energy changes in chemical reactions often occur when new chemical bonds are formed. When new bonds are created, energy may be released, resulting in an exothermic reaction.