Question

question 11
what does gibbs free energy (g) represent in a chemical reaction?
the total entropy change
the total enthalpy change
the chemical potential energy
the mechanical potential energy
question 12
which of the following occurs as a chemical reaction proceeds?
the chemical energy remains constant.
the chemical energy increases.
the chemical energy decreases.
the chemical energy initially increases, then decreases.

Explanation:

QUESTION 11

• Total entropy change is related to \( \Delta S \), not Gibbs free energy (\( G \)).
• Total enthalpy change is \( \Delta H \), not \( G \).
• Gibbs free energy represents the chemical potential energy available to do work in a reaction.
• Mechanical potential energy is unrelated to chemical reactions' Gibbs free energy.

• In a chemical reaction, bonds are broken (absorbing energy) and formed (releasing energy). Overall, for a spontaneous reaction, energy is released, so chemical energy (potential energy of reactants/products) decreases as the reaction proceeds (reactants convert to products with lower chemical energy, releasing energy). It doesn't remain constant, increase, or have a two - stage change as described in other options.

Answer:

C. The chemical potential energy

QUESTION 12