A graph showing concentration decreasing over time and approaching a non-zero constant value could represent the concentration of a:
Correct answer: B. Reactant in a reversible reaction.
- A. Product in a reversible reaction
- B. Reactant in a reversible reaction.
- C. Product in an irreversible reaction
- D. Reactant in an irreversible reaction
Explanation
The graph shows a decreasing concentration, characteristic of a reactant. Since the concentration levels off at a value greater than zero, it indicates that the reaction reaches equilibrium and does not go to completion. This is characteristic of a reactant in a reversible reaction.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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