Thermodynamic and Kinetic Control - AP Chemistry
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What is the difference between thermodynamic and kinetic control in a reaction?
What is the difference between thermodynamic and kinetic control in a reaction?
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Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.
Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.
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Which control is associated with reaction irreversibility?
Which control is associated with reaction irreversibility?
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Kinetic control. Irreversible reactions trap products, favoring fast formation.
Kinetic control. Irreversible reactions trap products, favoring fast formation.
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What does a reaction under kinetic control prioritize?
What does a reaction under kinetic control prioritize?
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It prioritizes the product formed fastest. Lowest activation energy pathway determines formation rate.
It prioritizes the product formed fastest. Lowest activation energy pathway determines formation rate.
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What is the main characteristic of a thermodynamically controlled reaction?
What is the main characteristic of a thermodynamically controlled reaction?
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Stability of the final product. Thermodynamic stability determines final product distribution.
Stability of the final product. Thermodynamic stability determines final product distribution.
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State the formula for Gibbs free energy.
State the formula for Gibbs free energy.
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$\triangle G = \triangle H - T\triangle S$. Combines enthalpy and entropy effects at given temperature.
$\triangle G = \triangle H - T\triangle S$. Combines enthalpy and entropy effects at given temperature.
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What is the activation energy barrier?
What is the activation energy barrier?
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The energy required to initiate a reaction. Minimum energy needed for reactants to reach transition state.
The energy required to initiate a reaction. Minimum energy needed for reactants to reach transition state.
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Identify the type of control when product formation is fast.
Identify the type of control when product formation is fast.
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Kinetic control. Fast formation rate indicates kinetic control dominance.
Kinetic control. Fast formation rate indicates kinetic control dominance.
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Which control is associated with reaction reversibility?
Which control is associated with reaction reversibility?
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Thermodynamic control. Reversible reactions can reach equilibrium, favoring stable products.
Thermodynamic control. Reversible reactions can reach equilibrium, favoring stable products.
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What does a reaction under thermodynamic control prioritize?
What does a reaction under thermodynamic control prioritize?
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It prioritizes the most stable product. Lowest Gibbs free energy determines thermodynamic favorability.
It prioritizes the most stable product. Lowest Gibbs free energy determines thermodynamic favorability.
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What outcome does high stability of a product suggest?
What outcome does high stability of a product suggest?
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It is thermodynamically favorable. High stability corresponds to negative $\Delta G$ values.
It is thermodynamically favorable. High stability corresponds to negative $\Delta G$ values.
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What is the effect of a catalyst on the equilibrium position?
What is the effect of a catalyst on the equilibrium position?
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No effect on equilibrium position. Catalysts affect rate but not thermodynamic equilibrium.
No effect on equilibrium position. Catalysts affect rate but not thermodynamic equilibrium.
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How does increasing temperature affect thermodynamic control?
How does increasing temperature affect thermodynamic control?
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It can increase thermodynamic control favorability. Higher T promotes equilibration toward stable products.
It can increase thermodynamic control favorability. Higher T promotes equilibration toward stable products.
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Which factor primarily determines thermodynamic control?
Which factor primarily determines thermodynamic control?
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Gibbs free energy. Overall energy change determines final product stability.
Gibbs free energy. Overall energy change determines final product stability.
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In which condition is kinetic control more likely to dominate?
In which condition is kinetic control more likely to dominate?
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At lower temperatures. Lower T reduces thermal energy, favoring fastest pathway.
At lower temperatures. Lower T reduces thermal energy, favoring fastest pathway.
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What does a negative $\triangle G$ indicate for a reaction?
What does a negative $\triangle G$ indicate for a reaction?
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The reaction is spontaneous. Negative $\Delta G$ means reaction proceeds forward spontaneously.
The reaction is spontaneous. Negative $\Delta G$ means reaction proceeds forward spontaneously.
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Does kinetic control depend on reaction conditions?
Does kinetic control depend on reaction conditions?
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Yes, especially temperature. Temperature strongly influences kinetic versus thermodynamic control.
Yes, especially temperature. Temperature strongly influences kinetic versus thermodynamic control.
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Find the term for a reaction that favors the most stable product.
Find the term for a reaction that favors the most stable product.
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Thermodynamic control. Product with lowest $\Delta G$ is thermodynamically favored.
Thermodynamic control. Product with lowest $\Delta G$ is thermodynamically favored.
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What is the role of a catalyst in kinetic control?
What is the role of a catalyst in kinetic control?
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It lowers the activation energy. Provides alternative pathway with lower activation energy.
It lowers the activation energy. Provides alternative pathway with lower activation energy.
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What is the difference between thermodynamic and kinetic control in a reaction?
What is the difference between thermodynamic and kinetic control in a reaction?
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Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.
Thermodynamic control favors stability; kinetic control favors speed. Thermodynamic focuses on lowest energy state, kinetic on pathway speed.
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What is the main characteristic of a kinetically controlled reaction?
What is the main characteristic of a kinetically controlled reaction?
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Speed of product formation. Rate of formation determines which product predominates.
Speed of product formation. Rate of formation determines which product predominates.
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In which condition is thermodynamic control more likely to dominate?
In which condition is thermodynamic control more likely to dominate?
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At higher temperatures. Higher T provides energy to overcome barriers, favoring stability.
At higher temperatures. Higher T provides energy to overcome barriers, favoring stability.
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What does the term 'activation energy' refer to?
What does the term 'activation energy' refer to?
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The minimum energy needed to start a reaction. Energy barrier that must be overcome for reaction to proceed.
The minimum energy needed to start a reaction. Energy barrier that must be overcome for reaction to proceed.
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State the effect of a catalyst on reaction rate.
State the effect of a catalyst on reaction rate.
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It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.
It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.
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Identify the product formed when a reaction is under kinetic control.
Identify the product formed when a reaction is under kinetic control.
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The product formed at a faster rate. Pathway with lowest activation energy dominates formation.
The product formed at a faster rate. Pathway with lowest activation energy dominates formation.
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Define kinetic control in one sentence.
Define kinetic control in one sentence.
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Control based on the rate of product formation. Reaction outcome determined by formation rates, not stability.
Control based on the rate of product formation. Reaction outcome determined by formation rates, not stability.
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How does temperature affect thermodynamic versus kinetic control?
How does temperature affect thermodynamic versus kinetic control?
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Higher T favors thermodynamic; lower T favors kinetic. Temperature affects energy available to overcome barriers.
Higher T favors thermodynamic; lower T favors kinetic. Temperature affects energy available to overcome barriers.
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What does a low activation energy imply for a reaction?
What does a low activation energy imply for a reaction?
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It is likely kinetically favorable. Low barrier means reaction proceeds quickly.
It is likely kinetically favorable. Low barrier means reaction proceeds quickly.
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Identify which product is favored under thermodynamic control.
Identify which product is favored under thermodynamic control.
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The product with the lower Gibbs free energy. Most negative $\Delta G$ indicates highest stability.
The product with the lower Gibbs free energy. Most negative $\Delta G$ indicates highest stability.
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State the effect of a catalyst on reaction rate.
State the effect of a catalyst on reaction rate.
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It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.
It increases the reaction rate. Lowers $E_a$, increasing forward and reverse rates equally.
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Identify the type of control when product formation is fast.
Identify the type of control when product formation is fast.
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Kinetic control. Fast formation rate indicates kinetic control dominance.
Kinetic control. Fast formation rate indicates kinetic control dominance.
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