Explore BrainMass
Share

1st Order Kinetics Plot and Half Life Determination

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

After applying 2,4-D to turf, an experiment was conducted measuring the concentration of 2,4-D that was present over time. The 2,4-D concentration was 80 ppm on day zero, 45 ppm on day 14, and 6 ppm on day 56.

a. Do a first order kinetic plot to determine the rate constant for the disappearance of 2,4-D.
b. What is the half life for disappearance of 2,4-D in this experiment?

© BrainMass Inc. brainmass.com October 25, 2018, 5:44 am ad1c9bdddf
https://brainmass.com/chemistry/chemical-kinetics/1st-order-kinetics-plot-and-half-life-determination-432521

Solution Preview

Chemical kinetics involves 'rate laws' which are mathematical equations that describe the progress of a certain reaction. A rate law expresses the rate as being directly proportional to the rate constant (k) and the concentration of the reactant/s.

First-order kinetics is based on a reaction whose rate depends on the concentration of just one reactant. In a first order reaction the rate is directly proportional to the concentration of one of the reactants. There may be other reactants involved, but their concentrations will ...

Solution Summary

This solution shows the detailed steps on how to make a first order kinetic plot from a given set of experimental data including concentration and time. It also shows the important equations needed to construct the plot and calculate the rate constant and half life of a specific substance. An attachment is included so that students will be easily understand how to maximize the use of MS Excel in constructing kinetic plots. The solution can be applied to any branch of chemistry that encompasses chemical kinetics.

$2.19
See Also This Related BrainMass Solution

Physical Chemistry Collision Theory

I have a list of terms that needs to be defined in a Physical Chemistry course. With each definition I need an example for each term, as a description to it or so

term Chapter
collision theory
transition state theory
rate constant
Arrhenius equation
integrated rate law
rate law
activation energy
pseudo first order
preexponential factor (a)
half life
zeroth order reaction
first order reaction
second order reaction
third order reaction
method of initial rates
isolation method
reaction profile
collision frequency
reaction coordinate
flash photolysis
stopped flow experiment
temperature jump experiment
elementary reactions
consecutive reactions
unimolecular reactions
molecularity
steady state approximation
rate-determining step
diffusion-controlled limit
Homogeneous catalyst
catalyst
heterogeneous catalyst
Michealis- Menten kinetics
KM Michealis constant
Maximum Turnover number
Maximum Velocity
Line-Weaver-Burke Plot
Woolf Plot
Eadee-Hofstee Plot
Competitive inhibitor
Non-Competitive Inhibitor
Uncompetitive Inhibitor
Chain Reaction
Inhibition Step
Termination Step
Retardation Step
Branching Step

View Full Posting Details