AP Chemistry
5.9 Pre-Equilibrium Approximation
5.8 Reaction Mechanism and Rate Law
5.2 Introduction to Rate Law
A proposed mechanism for the gas-phase reaction between \(\text{NO}(g)\) and \(\text{Br}_2(g)\) is shown below.
\[ \text{Step 1: } \text{NO}(g) + \text{Br}_2(g) \rightleftharpoons \text{NOBr}_2(g) \quad (\text{fast equilibrium}) \]
\[ \text{Step 2: } \text{NOBr}_2(g) + \text{NO}(g) \rightarrow 2\,\text{NOBr}(g) \quad (\text{slow}) \]
A mixture of \(\text{NO}(g)\) and \(\text{Br}_2(g)\) is placed in a reaction vessel fitted with a movable piston at a constant temperature. If the piston is pushed down so that the volume of the gas mixture decreases to \(\dfrac{1}{3}\) of its initial volume, which of the following best predicts the effect on the initial rate of the reaction, and why?
\[ \text{Step 1: } \text{NO}(g) + \text{Br}_2(g) \rightleftharpoons \text{NOBr}_2(g) \quad (\text{fast equilibrium}) \]
\[ \text{Step 2: } \text{NOBr}_2(g) + \text{NO}(g) \rightarrow 2\,\text{NOBr}(g) \quad (\text{slow}) \]
A mixture of \(\text{NO}(g)\) and \(\text{Br}_2(g)\) is placed in a reaction vessel fitted with a movable piston at a constant temperature. If the piston is pushed down so that the volume of the gas mixture decreases to \(\dfrac{1}{3}\) of its initial volume, which of the following best predicts the effect on the initial rate of the reaction, and why?
Similar Questions
Tools for a 5
AP aligned mock tests to help you get a 5.
With grading, adaptive explanations, and more.
Find a Quiz
Find, solve, and grade every AP FRQ ever.
Find an FRQ
Stuck on AP Chemistry? Get unstuck with an AP specialist.1 to 1 tutors who know the exam inside out. Understand weeks of material in a single session.Find a Tutor
Learn AP Physics from scratch, quickly. This is the only course you'll need for the year.
A self-paced course with everything you need to get a 5. Trusted by over 15,000 students and 200+ schools. Learn fast, or we'll refund your purchase, backed by our 100% satisfaction guarantee.
Explore the Course