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AP Intermediate 1st Year Equilibrium — practice questions

Explore 78 free Equilibrium questions in AP Intermediate 1st Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Equilibrium questions and exercises with answers

Showing questions 1–30 of 78.

As per your syllabus, equilibrium in a physical or chemical process is best described as which kind?Read the answer and worked solution →As per your syllabus, equilibrium can only be attained under which condition?Read the answer and worked solution →As per your syllabus, eqn 6.4, for the reaction aA + bB ⇌ cC + dD, the equilibrium constant Kc is expressed as which?Read the answer and worked solution →As per your syllabus, eqn 6.8, if Kc is the equilibrium constant of a forward reaction, the equilibrium constant of the REVERSE reaction equals which?Read the answer and worked solution →As per your syllabus, if a balanced chemical equation is MULTIPLIED throughout by n, the new equilibrium constant equals which?Read the answer and worked solution →As per your syllabus, eqn 6.15, the relationship between Kp and Kc for a gaseous reaction is which?Read the answer and worked solution →As per your syllabus, for the reaction H₂(g) + I₂(g) ⇌ 2 HI(g), the relation between Kp and Kc is which?Read the answer and worked solution →As per your syllabus, for N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g), the relation between Kp and Kc is which?Read the answer and worked solution →As per your syllabus, given [N₂] = 1.5×10⁻² M, [H₂] = 3.0×10⁻² M, [NH₃] = 1.2×10⁻² M at 500 K, what is Kc for N₂ + 3H₂ ⇌ 2NH₃?Read the answer and worked solution →As per your syllabus, for the heterogeneous equilibrium CaCO₃(s) ⇌ CaO(s) + CO₂(g), the equilibrium constant Kp equals which?Read the answer and worked solution →As per your syllabus, the units of Kp for N₂O₄(g) ⇌ 2 NO₂(g) (when partial pressures are in bar) are which?Read the answer and worked solution →As per your syllabus, if the reaction quotient Q is LESS than the equilibrium constant K, the reaction proceeds in which direction?Read the answer and worked solution →As per your syllabus, eqn 6.22, the relation between standard Gibbs energy change ΔG° and equilibrium constant K is which?Read the answer and worked solution →As per your syllabus, if ΔG° is negative for a reaction, the value of equilibrium constant K satisfies which?Read the answer and worked solution →As per your syllabus, if Kc > 10³, what does this magnitude indicate about the reaction at equilibrium?Read the answer and worked solution →As per your syllabus, adding an INERT gas (e.g. argon) at CONSTANT VOLUME to a gaseous equilibrium has what effect?Read the answer and worked solution →As per your syllabus, for an EXOTHERMIC reaction, what is the effect of raising the temperature on the equilibrium constant K?Read the answer and worked solution →As per your syllabus, what is the effect of adding a CATALYST on the position of equilibrium and on K?Read the answer and worked solution →As per your syllabus, given ΔG° = 13.8 kJ/mol at 298 K for glucose phosphorylation, the value of Kc is closest to which?Read the answer and worked solution →As per your syllabus, given Kc = 3.75×10⁻⁶ at 1069 K for 2 NOCl(g) ⇌ 2 NO(g) + Cl₂(g), the value of Kp is closest to which?Read the answer and worked solution →As per your syllabus, in the ARRHENIUS concept, an acid is defined as a substance which does which on dissolving in water?Read the answer and worked solution →As per your syllabus, in the BRØNSTED-LOWRY concept, an acid is defined as which kind of species?Read the answer and worked solution →As per your syllabus, in the LEWIS concept (G.N. Lewis, 1923), a base is defined as which kind of species?Read the answer and worked solution →As per your syllabus, what is the conjugate base of the Brønsted acid HSO₄⁻?Read the answer and worked solution →As per your syllabus, + Problem 6.13, what is the conjugate acid of the Brønsted base NH₃?Read the answer and worked solution →As per your syllabus, the conjugate base of a STRONG acid is necessarily which kind of base?Read the answer and worked solution →As per your syllabus, eqn 6.28, the ionic product of water Kw = [H⁺][OH⁻] at 298 K has which value?Read the answer and worked solution →As per your syllabus, Kw varies with which physical variable, since it is itself an equilibrium constant?Read the answer and worked solution →As per your syllabus, the pH of a solution is defined as which expression?Read the answer and worked solution →As per your syllabus, eqn 6.29, at 298 K, what is the value of pH + pOH for any aqueous solution?Read the answer and worked solution →

Worked practice questions

As per your syllabus, equilibrium in a physical or chemical process is best described as which kind?

  1. Static
  2. Dynamic
  3. Frozen
  4. One-directional
Show answer and solution

Correct answer: B. Dynamic

Your syllabus: equilibrium is dynamic — forward and reverse rates equal, not zero. Confirmed by radioactive-sugar + deuterium-ammonia experiments.

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As per your syllabus, equilibrium can only be attained under which condition?

  1. In an open beaker at any T
  2. Only at T = 0 K
  3. In a closed system at constant T
  4. Only at infinite dilution
Show answer and solution

Correct answer: C. In a closed system at constant T

Your syllabus: equilibrium requires a closed system at fixed T. Open systems (evaporating watch glass) never reach equilibrium.

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As per your syllabus, eqn 6.4, for the reaction aA + bB ⇌ cC + dD, the equilibrium constant Kc is expressed as which?

  1. [A]^a [B]^b / [C]^c [D]^d
  2. [C]^c [D]^d / [A]^a [B]^b
  3. [A][B][C][D]
  4. [C][D] / [A][B]
Show answer and solution

Correct answer: B. [C]^c [D]^d / [A]^a [B]^b

syllabus eqn 6.4 (Law of Mass Action, Guldberg-Waage 1864): Kc = products / reactants, each raised to stoichiometric coefficient.

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