Chemistry: Kinetics & Chemical Equilibrium Flashcards
7 cards from real AP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Chemistry: Kinetics & Chemical Equilibrium flashcards as text
For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), what is the correct expression for Kc?
Answer: [NH3]^2 / ([N2][H2]^3)
Kc places products over reactants, each raised to its stoichiometric coefficient.
If Q < K for a reaction, the system will
Answer: shift toward products
When Q < K, the reaction proceeds forward to form more products until Q = K.
For an exothermic reaction at equilibrium, increasing temperature will
Answer: shift toward reactants and decrease K
Adding heat to an exothermic reaction shifts equilibrium toward reactants, lowering K.
Decreasing the volume of a gaseous equilibrium system shifts the reaction toward
Answer: the side with fewer moles of gas
Increasing pressure by reducing volume shifts equilibrium toward fewer gas moles.
Which change does NOT alter the value of the equilibrium constant K?
Answer: Adding a catalyst
Only temperature changes K; a catalyst speeds equilibrium but leaves K unchanged.
For a reaction with a very large K (K >> 1), the equilibrium mixture contains
Answer: mostly products
A large K means products dominate at equilibrium.
Adding an inert gas at constant volume to a gaseous equilibrium will
Answer: not shift the equilibrium
At constant volume an inert gas does not change partial pressures or concentrations, so no shift occurs.