Equilibrium and Reaction Rates Flashcards
6 cards from real CART practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Equilibrium and Reaction Rates flashcards as text
Le Chatelier's Principle predicts that for an exothermic reaction at equilibrium, increasing temperature will:
Answer: Shift equilibrium toward reactants
Adding heat to an exothermic reaction shifts equilibrium left (toward reactants) because heat acts as a product in the reaction.
The reaction quotient Q is used to:
Answer: Predict which direction a reaction will proceed to reach equilibrium
Comparing Q to Kc predicts direction: if Q Kc, reaction proceeds in reverse.
Which statement about a catalyst is correct?
Answer: It provides an alternate pathway with lower activation energy
A catalyst works by providing an alternative reaction mechanism with a lower activation energy, speeding up the reaction without being consumed.
For the equilibrium N₂O₄(g) ⇌ 2NO₂(g), adding more N₂O₄ will:
Answer: Shift equilibrium to the right to produce more NO₂
Adding more N₂O₄ increases reactant concentration, so Le Chatelier's Principle shifts equilibrium right to consume the added reactant.
A reaction has Kc = 1.0 × 10⁻⁸. This very small value indicates that at equilibrium:
Answer: Reactants are highly favored
A very small Kc means the denominator (reactants) greatly exceeds the numerator (products), so reactants are strongly favored at equilibrium.
Which graph best represents the concentration changes of reactants and products as a reversible reaction reaches equilibrium?
Answer: Both concentrations level off and remain constant after equilibrium is reached
At equilibrium, concentrations of all species become constant (though not necessarily equal), shown as flat horizontal lines on a concentration-time graph.