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: What is the half-life of a compound with a concentration of 0.25 M and an observed rate constant of 0.15 min -1?A.  0.038 min B.  0.22 min   C.  0.83 min   D.  4.6 min     E.  27 min

Solution: What is the half-life of a compound with a concentration of 0.25 M and an observed rate constant of 0.15 min -1?A.  0.038 min B.  0.22 min   C.  0.83 min   D.  4.6 min     E.  27 min

Problem

What is the half-life of a compound with a concentration of 0.25 M and an observed rate constant of 0.15 min -1?

A.  0.038 min 

B.  0.22 min   

C.  0.83 min   

D.  4.6 min     

E.  27 min

Solution

We’re being asked to determine the half-life of a compound with a concentration of 0.25 M and an observed rate constant of 0.15 min–1


Recall that half-life is the time needed for the amount of a reactant to decrease by 50% or one-half.


We don’t know the order of the reaction but we can quickly figure it out from the rate constant. Recall that the unit for the rate constant is given by:



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