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: The following is a quote from an article in the August 18, 1998, issue of The New York Times about the breakdown of cellulose and starch: "A drop of 18 degrees Fahrenheit [from 77 oF to 59 oF] lowers the reaction rate six times; a 36-degree drop [from 77 oF to 41 oF] produces a fortyfold decrease in the rate."Assuming the value of Ea calculated from the 36-degree drop and assuming that the rate of breakdown is first order with a half-life at 25 oC of 2.7 years, calculate the half-life for breakdown at a temperature of -15 oC.

Solution: The following is a quote from an article in the August 18, 1998, issue of The New York Times about the breakdown of cellulose and starch: "A drop of 18 degrees Fahrenheit [from 77 oF to 59 oF] lowers

Problem

The following is a quote from an article in the August 18, 1998, issue of The New York Times about the breakdown of cellulose and starch: "A drop of 18 degrees Fahrenheit [from 77 oF to 59 oF] lowers the reaction rate six times; a 36-degree drop [from 77 oF to 41 oF] produces a fortyfold decrease in the rate."

Assuming the value of Ea calculated from the 36-degree drop and assuming that the rate of breakdown is first order with a half-life at 25 oC of 2.7 years, calculate the half-life for breakdown at a temperature of -15 oC.