AP Chemistry Flashcards: Representations of Equilibrium
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
If a particulate model at equilibrium shows significantly more product particles than reactant particles, what does this imply about the equilibrium constant (K)?
This implies that the value of the equilibrium constant (K) is large (K > 1), as the equilibrium lies to the right, favoring products.
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If a particulate model at equilibrium shows significantly more product particles than reactant particles, what does this imply about the equilibrium constant (K)?
This implies that the value of the equilibrium constant (K) is large (K > 1), as the equilibrium lies to the right, favoring products.
If a particulate model for the reaction A ⇌ 2B at equilibrium contains 5 'A' particles and 10 'B' particles, is the equilibrium constant greater than, less than, or equal to 1?
The equilibrium constant (K) would be described as being large or greater than 1, as there are more product particles than reactant particles at equilibrium.
How does a particulate representation illustrate that a system has reached equilibrium?
It shows that the relative numbers of reactant and product particles have become constant, indicating the forward and reverse reaction rates are equal.
A particulate model for a system *prior to* equilibrium shows only reactant particles. What does this represent?
This represents the initial state of the reaction (time = 0), before the forward reaction has proceeded to form any products.
A particulate representation at equilibrium shows a large number of reactant particles and only a few product particles. What does this indicate about the reaction?
This indicates the reaction is reactant-favored and the value of the equilibrium constant (K) is small (K < 1).
What information from a particulate model at equilibrium is used to describe the value of the equilibrium constant?
The relative numbers of reactant and product particles present at equilibrium are used to describe the magnitude of the equilibrium constant.
How can a particulate model visually represent the concept of a dynamic equilibrium?
While a static image shows constant particle counts, it represents a dynamic state where the forward and reverse reactions occur at equal rates, maintaining those counts.
What is a particulate model in the context of a reversible reaction?
A particulate model is a representation that uses drawings of individual particles to show the relative numbers of reactants and products in a system.
What two states of a reversible reaction can be described using particulate representations?
Particulate representations can be used to describe the relative numbers of particles present both prior to equilibrium and at equilibrium.
Define a reversible reaction.
A reversible reaction is a chemical process where reactants form products which, in turn, react together to give the reactants back.