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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. This is a traditional kinetic unit which incorporates Simulabs as a supplement.

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Kinetics and the Virtual Molecular Dynamics Lab

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  1. Kinetics and the Virtual Molecular Dynamics Lab Kinetics Made Easy Susan Grillo Jay Chandler Dan Burton

  2. 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.

  3. 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.

  4. 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.

  5. 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

  6. 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.

  7. 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.

  8. Resources Crystal violet lab: • Crystal violet (2.0 x 10 –5 M) • NaOH (0.10M) • Set-up time is approximately 1 hour.

  9. Demonstrations • Surface area demonstration. • Elephant’s toothpaste catalysis demonstration: 30% H2O2 ( 125 mL) KI Dishwashing liquid Food coloring

  10. 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.

  11. 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

  12. 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

  13. 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

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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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