AP Chemistry Flashcards: Thermodynamic And Kinetic Control

What this deck covers

This deck focuses on Thermodynamic And Kinetic Control, giving you a quick way to review the definitions, rules, and examples that matter most for AP Chemistry.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is the difference between thermodynamic and kinetic control in a reaction?

Answer: Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.

Flashcard 2: Which control is associated with reaction irreversibility?

Answer: Kinetic control. Irreversible reactions trap products, favoring fast formation.

Flashcard 3: What does a reaction under kinetic control prioritize?

Answer: It prioritizes the product formed fastest. Lowest activation energy pathway determines formation rate.

Flashcard 4: What is the main characteristic of a thermodynamically controlled reaction?

Answer: Stability of the final product. Thermodynamic stability determines final product distribution.

Flashcard 5: State the formula for Gibbs free energy.

Answer: $\triangle G = \triangle H - T\triangle S$. Combines enthalpy and entropy effects at given temperature.

Flashcard 6: What is the activation energy barrier?

Answer: The energy required to initiate a reaction. Minimum energy needed for reactants to reach transition state.

Flashcard 7: Identify the type of control when product formation is fast.

Answer: Kinetic control. Fast formation rate indicates kinetic control dominance.

Flashcard 8: Which control is associated with reaction reversibility?

Answer: Thermodynamic control. Reversible reactions can reach equilibrium, favoring stable products.

Flashcard 9: What does a reaction under thermodynamic control prioritize?

Answer: It prioritizes the most stable product. Lowest Gibbs free energy determines thermodynamic favorability.

Flashcard 10: What outcome does high stability of a product suggest?

Answer: It is thermodynamically favorable. High stability corresponds to negative $\Delta G$ values.

Flashcard 11: What is the effect of a catalyst on the equilibrium position?

Answer: No effect on equilibrium position. Catalysts affect rate but not thermodynamic equilibrium.

Flashcard 12: How does increasing temperature affect thermodynamic control?

Answer: It can increase thermodynamic control favorability. Higher T promotes equilibration toward stable products.

Flashcard 13: Which factor primarily determines thermodynamic control?

Answer: Gibbs free energy. Overall energy change determines final product stability.

Flashcard 14: In which condition is kinetic control more likely to dominate?

Answer: At lower temperatures. Lower T reduces thermal energy, favoring fastest pathway.

Flashcard 15: What does a negative $\triangle G$ indicate for a reaction?

Answer: The reaction is spontaneous. Negative $\Delta G$ means reaction proceeds forward spontaneously.

Flashcard 16: Does kinetic control depend on reaction conditions?

Answer: Yes, especially temperature. Temperature strongly influences kinetic versus thermodynamic control.

Flashcard 17: Find the term for a reaction that favors the most stable product.

Answer: Thermodynamic control. Product with lowest $\Delta G$ is thermodynamically favored.

Flashcard 18: What is the role of a catalyst in kinetic control?

Answer: It lowers the activation energy. Provides alternative pathway with lower activation energy.

Flashcard 19: What is the difference between thermodynamic and kinetic control in a reaction?

Answer: Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.

Flashcard 20: What is the main characteristic of a kinetically controlled reaction?

Answer: Speed of product formation. Rate of formation determines which product predominates.

Flashcard 21: In which condition is thermodynamic control more likely to dominate?

Answer: At higher temperatures. Higher T provides energy to overcome barriers, favoring stability.

Flashcard 22: What does the term 'activation energy' refer to?

Answer: The minimum energy needed to start a reaction. Energy barrier that must be overcome for reaction to proceed.

Flashcard 23: State the effect of a catalyst on reaction rate.

Answer: It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.

Flashcard 24: Identify the product formed when a reaction is under kinetic control.

Answer: The product formed at a faster rate. Pathway with lowest activation energy dominates formation.

Flashcard 25: Define kinetic control in one sentence.

Answer: Control based on the rate of product formation. Reaction outcome determined by formation rates, not stability.

Flashcard 26: How does temperature affect thermodynamic versus kinetic control?

Answer: Higher T favors thermodynamic; lower T favors kinetic. Temperature affects energy available to overcome barriers.

Flashcard 27: What does a low activation energy imply for a reaction?

Answer: It is likely kinetically favorable. Low barrier means reaction proceeds quickly.

Flashcard 28: Identify which product is favored under thermodynamic control.

Answer: The product with the lower Gibbs free energy. Most negative $\Delta G$ indicates highest stability.

Flashcard 29: State the effect of a catalyst on reaction rate.

Answer: It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.

Flashcard 30: Identify the type of control when product formation is fast.

Answer: Kinetic control. Fast formation rate indicates kinetic control dominance.