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Kinetics and the Virtual Molecular Dynamics Lab. Kinetics Made Easy Susan Grillo Jay Chandler Dan Burton. Introduction. This is a traditional kinetic unit which incorporates Simulabs as a supplement.

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kinetics and the virtual molecular dynamics lab

Kinetics and the Virtual Molecular Dynamics Lab

Kinetics Made Easy

Susan Grillo

Jay Chandler

Dan Burton

introduction
Introduction
  • This is a traditional kinetic unit which incorporates Simulabs as a supplement.
  • Incorporation of SimuLab will aid the visual interpretation of the kinetics of a reaction.
intended audience
Intended Audience
  • Advanced Placement or Chem II Students.
  • The topics of kinetics and rate laws are incorporated in the SAT II to a very slight degree, and to a larger degree on the AP Chem Exam.
  • The Simulabs are intended to enhance the students understanding of kinetics.
placement in the curriculum
Placement in the Curriculum
  • The unit will enhance the curriculum already in place.
  • The major revision is the use of the appropriate SimuLabs to enhance the understanding of 1st and 2nd order reactions and activation energy.
  • Students need an understanding of reactions rates prior to starting this unit.
adjustments adaptation
Honors 1 Chemistry

No Zero Order or fractional reaction rates.

Substitute the Methyl Violet Lab with the Vitamin C Clock Lab.

Chemistry

No Graphing.

Only use Vitamin C Clock Lab.

Only show the relationship between initial conc., temp., and rate.

Adjustments / Adaptation
goals and objectives
Goals and Objectives
  • Students will define the key terms involved in chemical kinetics and factors affecting rate.
  • Students will use lab data and construct graphs to determine reaction order and the rate law.
  • Students will apply the Arrhenius Equation to calculate activation energy and constants.
  • Students will be able to develop a procedure to determine the rate law of a reaction.
  • Given experimental data, students will be able to derive a rate law and select an appropriate mechanism for a reaction.
slide7
Pre-Lab, Lab and Post-Lab

Instructional

Time
  • Two days
  • are needed for a wet lab .
  • Two days are required
  • for Simulabs 2.1; 2.2; 2.3.
  • One day is required for
  • Poster/PowerPoint
  • presentation.
  • Five days are required for instruction related to zero, first, and second order reactions and to discuss the differential and integrated rate laws, half-life and slope equation.
resources
Resources

Crystal violet lab:

  • Crystal violet (2.0 x 10 –5 M)
  • NaOH (0.10M)
  • Set-up time is approximately 1 hour.
demonstrations
Demonstrations
  • Surface area demonstration.
  • Elephant’s toothpaste catalysis demonstration:

30% H2O2 ( 125 mL)

KI

Dishwashing liquid

Food coloring

electronic equipment
Electronic Equipment
  • CBL/ Spec 20

Notes: If CBL’s used then only one is needed for graphing.

Simulab requires one computer

for every two to three students.

  • CBL Probes for colorimetry.
instructional activities chronology
Instructional Activities Chronology

Day One:

  • Introduction to reaction rates
  • Demonstrations

Days Two - Four:

  • Average rate versus instantaneous rate:

Method of initial rate

Types of rate laws

Use of integrated rates

Use of zero order, 1st and 2nd order rates

Graphing of integrated rate laws

Half-life

instructional activities chronology continued
Instructional ActivitiesChronology Continued

Day five:

  • Mechanisms/ rate-determining step/ intermediates
  • Collision model
  • Catalysis

Days six – nine:

  • Laboratories:
  • Crystal violet
  • SimuLab # 2.1, 2.2; 2.3 (From the Yellow book)

Day ten- eleven:

  • Poster/PowerPoint preparation & presentation
2 1 simulab
2.1 Simulab
  • Students will complete the lab and graph:
  • [red] vs time
  • 1/[red] vs time
  • Ln [Red] versus time to determine k, half-life,
  • and order of reaction
simulab 2 2
Simulab 2.2:

Students will complete Simulab 2.2 and will graph:

  • Students will complete the lab and graph:
  • [red] vs time
  • 1/[red] vs time
  • Ln [red] versus time

to determine k, half-life, and order of reaction.

simulab 2 3
Simulab 2.3:

Students will:

  • run Simulab 2.3 three

times at different temperatures.

  • calculate k for each temperature.
  • use the Arrhenius equation to calculate the activation energy.
assessment
Assessment
  • Students must produce a traditional

lab report in response to the wet lab.

  • Students will submit problem sets to

be graded.

  • A traditional end of unit, criterion-

based test will be administered.

assessment continued
Assessment Continued
  • Students will produce a PowerPoint

/Posterboard summary of their Simulab work and answer the following questions:

  • How is the rate constant determined graphically?
  • How is the rate order determined graphically?
  • How does the initial concentration affect the half-life?
  • How does the change in temperature affect the rate constant?
  • Using collision theory, explain the difference

between first and second order reactions.

rate law summary
Rate Law Summary

By integrating Simulabs with wet labs:

  • Students will be exposed to visual

representations of the rate laws of

various order.

  • Students will make connections

between the dynamic molecular models

and the graphs and equations which define

the various rate laws.

rate law summary continued
Rate Law Summary Continued
  • Students will explore the relationships

between temperature, reaction rates,

and constants as well as initial

concentration and half-life.

  • Students will be able to calculate the

activation energy from their data.

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