When a Reversible Chemical Reaction Is at Equilibrium

question 15

Multiple Choice

When a reversible chemical reaction is at equilibrium,

• A)the rate of the reaction in one direction is equal to the rate in the reverse direction.
• B)the concentration of the reactants is equal to the concentration of the products.
• C)both the forward and reverse reactions stop occurring.
• D)the supply of reactants has become exhausted,so the forward reaction ceases and the rate of the reverse reaction increases.
• E)catalysts no longer influence either the forward or reverse reaction rates.

---

Definitions:

Anaerobic Metabolism

Anaerobic metabolism is the process of energy production in cells without the use of oxygen, resulting in the production of lactic acid or alcohol.

Autorhythmic Contractions

Rhythmic contractions initiated by specialized heart cells responsible for the heart's spontaneous beating.

Ca2+

Calcium ions, which play crucial roles in cellular processes such as muscle contraction, neurotransmitter release, and signal transduction.

Smooth Muscle

A type of muscle found in the walls of internal organs and blood vessels that is controlled involuntarily, enabling functions such as regulating blood flow and moving food through the digestive system.