Question

rmochemical equations
which statement is true for most chemical reactions?
the internal energy of the
system increases during a
reaction.
the enthalpy of the
products is higher than the
enthalpy of the reactants.
an energy change occurs
during the breaking and
forming of bonds.
energy is released during
the formation of reactants.

Explanation:

To determine the correct statement about most chemical reactions, we analyze each option:

• "The internal energy of the system increases during a reaction": Not true for most (exothermic reactions release energy, decreasing internal energy).
• "The enthalpy of the products is higher than the reactants": True for endothermic, but most reactions are exothermic (products have lower enthalpy).
• "An energy change occurs during bond breaking/forming": Bond breaking absorbs energy, bond forming releases energy—energy change is inherent to most reactions.
• "Energy is released during reactant formation": Reactants form via bond breaking (absorbs energy) or other processes; energy release is rare here.

Thus, the correct statement is "An energy change occurs during the breaking and forming of bonds."

Answer:

The statement "An energy change occurs during the breaking and forming of bonds." (the right - most boxed statement)