AP Chemistryhardmcq1 pt
Which reaction is expected to be fastest at room temperature?
A.Ag⁺(aq) + Cl⁻(aq) → AgCl(s)
B.2H₂ + O₂ → 2H₂O
C.Diamond → graphite
D.N₂ + 3H₂ → 2NH₃
Explanation
Core Concept
Aqueous ions react on contact with essentially no activation barrier — precipitation is near-instantaneous. High Ea processes (combustion without a flame, H₂/O₂ mixing) are slow despite being exothermic.
Correct Answer
AAg⁺(aq) + Cl⁻(aq) → AgCl(s)
More Unit 5: Kinetics practice questions
- mediumA first-order decomposition has a half-life of 12 minutes. What percentage of the original reactant concentration remains after 36 minutes?
- hardWhat is the overall order of a reaction with rate = k[A]⁰[B]²?
- hardWhich energy-profile feature distinguishes a catalyzed pathway from an uncatalyzed one?
- hardAn experiment tracks [A] over time and finds the half-life doubles as [A]₀ halves. What is the reaction order?
- hardIf the second of two steps is rate-determining, what happens to the intermediate from the first step?
Practice more AP Chemistry questions with full explanations
Practice Unit 5: Kinetics Questions →