Ch.13 - Chemical KineticsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Consider the reaction Cl2 (aq) + H2S (aq) → S (s) + 2 H+ (aq) + 2 Cl - (aq) The rate equation for this reaction is rate = k [Cl2] [H2S] Which of these mechanisms is (or are) consistent with this rate equation? I     Cl2 + H2S → H+ + Cl - + Cl+ + HS -          (slow)       Cl+ + HS - → H+ + Cl - + S                       (fast) II    H2S ⇌ H+ + HS -                                     (fast equilibrium)       Cl2 + HS - → 2Cl - + H+ S                         (slow)   (A) I only (B) II only (C) Both I and II (D) Neither I or II

Problem

Consider the reaction

Cl(aq) + H2S (aq) → S (s) + 2 H(aq) + 2 Cl (aq)

The rate equation for this reaction is

rate = k [Cl2] [H2S]

Which of these mechanisms is (or are) consistent with this rate equation?

I     Cl2 + H2S → H+ + Cl - + Cl+ + HS -          (slow)
      Cl+ + HS - → H+ + Cl - + S                       (fast)

II    H2S ⇌ H+ + HS -                                     (fast equilibrium)
      Cl2 + HS - → 2Cl - + H+ S                         (slow)

 

(A) I only

(B) II only

(C) Both I and II

(D) Neither I or II