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: Hydrogen peroxide decomposes into water and oxygen by the following reaction:2 H2O2(aq) ↔ 2 H2O(l) + O2(g) ΔHrxn = -94.64 kJ/molExperimental evidence tells us that this reaction is first order with re

Problem

Hydrogen peroxide decomposes into water and oxygen by the following reaction:

2 H2O2(aq) ↔ 2 H2O(l) + O2(g) ΔHrxn = -94.64 kJ/mol

Experimental evidence tells us that this reaction is first order with respect to hydrogen peroxide, with an activation energy of 75.3 kJ/mol at 300 K.

a. What is the activation energy for the reverse reaction?

b. Sketch the reaction pathway below. Be sure to label the axes, reactants, products, transition state, and energies.

c. Assuming the forward and reverse reaction have the same frequency factor, what is the equilibrium constant for this reaction? (when you answer this question, you will need to write down the value for K, and the temperature that you calculated K at.)

d. Catalase is an enzyme found in nearly all living organisms that catalyzes the hydrogen peroxide decomposition reaction shown above by lowering the activation energy of the forward reaction to 8.8 kJ/mol. How many times faster does hydrogen peroxide decompose in the presence of catalase?

e. What temperature would we need to decompose hydrogen peroxode at to achieve the same rate increase achieved with catalase?