Which of these systems exists in a state of chemical...

Which of these systems exists in a state of chemical equilibrium?
a. oxygen and hemoglobin in the human circulatory system
b. iodine crystals in an open beaker
c. the combustion of wood
d. the amount of ${ }^{14} \mathrm{C}$ in a decomposing organism

Key Concepts

Open vs Closed Systems

The distinction between open and closed systems is crucial in discussing equilibrium. A closed system does not exchange matter with its surroundings, which is a requirement for a reaction to achieve true chemical equilibrium. In contrast, an open system allows exchange of materials, often preventing the establishment of a fixed equilibrium state.

Irreversible Processes

Irreversible processes are chemical reactions or transformations that proceed largely in one direction without significant backward reaction. These processes, such as combustion or radioactive decay, do not reach a state of equilibrium because there is no meaningful reverse reaction to balance the forward process.

Chemical Equilibrium

Chemical equilibrium is a state in a reversible reaction where the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products over time, even though both reactions continue to occur. This concept is key in understanding how many chemical systems, when closed and undisturbed, reach a point where no net change is observed macroscopically.

Reversible Reactions

Reversible reactions are processes in which reactants can form products and those products can convert back into the original reactants. This bidirectional change is fundamental for achieving chemical equilibrium, as the continuous interconversion eventually leads to a balance in the concentrations of all species involved.

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