Question

1. which best describes the process of equilibrium?

a. a reaction with no changes
b. a reaction in which the reactants and
products are in the gaseous state
c. a reaction that occurs in a closed system
d. a reaction in which the rates of the forward
and reverse processes are equal
e. an irreversible chemical reaction

Explanation:

To determine the correct description of chemical equilibrium, we analyze each option:

• Option a: Reactions at equilibrium have dynamic changes (forward and reverse reactions occur), so "no changes" is incorrect.
• Option b: Equilibrium isn't defined by the state of matter (gaseous or not) of reactants and products. Reactions with solids, liquids, etc., can also be at equilibrium.
• Option c: While a closed system is often associated with equilibrium to prevent matter exchange, it's not the defining characteristic of equilibrium.
• Option d: The fundamental definition of chemical equilibrium is that the rate of the forward reaction equals the rate of the reverse reaction. At this point, the concentrations of reactants and products remain constant (though the reactions are still occurring).
• Option e: Equilibrium involves reversible reactions (both forward and reverse occur), so an irreversible reaction can't be at equilibrium.

Answer:

d. A reaction in which the rates of the forward and reverse processes are equal