Equilibrium and Reaction Rates Flashcards
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Read the first 6 Equilibrium and Reaction Rates flashcards as text
At chemical equilibrium, which of the following is true?
Answer: The forward and reverse reaction rates are equal
At equilibrium, the forward and reverse reactions occur at the same rate, so concentrations remain constant but are not necessarily equal.
For the reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant expression Kc is:
Answer: [NH₃]² / ([N₂][H₂]³)
Kc = [products]^coefficients / [reactants]^coefficients = [NH₃]² / ([N₂][H₂]³).
If Kc >> 1 for a reaction, the equilibrium mixture contains mostly:
Answer: Products
A large Kc value means the equilibrium lies far to the right, favoring product formation.
According to Le Chatelier's Principle, increasing the pressure on a gas-phase equilibrium will shift the reaction toward:
Answer: The side with fewer moles of gas
Le Chatelier's Principle states that increased pressure shifts the equilibrium toward the side with fewer moles of gas to relieve the stress.
Adding a catalyst to a reaction at equilibrium will:
Answer: Not change the equilibrium position but speed up reaching it
A catalyst lowers activation energy for both forward and reverse reactions equally, allowing equilibrium to be reached faster without changing Kc or position.
Which factor does NOT affect the value of the equilibrium constant Kc?
Answer: Concentration of reactants
Kc depends only on temperature; changing concentrations shifts the position of equilibrium but does not change the value of Kc.