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ACT2 Presents


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Presentation by Roxie Allen, Katy High School at CAST2009 in Galveston, Texas as part of the ACT2 strand on 11/6/09

Presentation by Roxie Allen, Katy High School at CAST2009 in Galveston, Texas as part of the ACT2 strand on 11/6/09

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  • 1. ACT 2 Presents 25 YEARS? That is Crazy!
  • 2.
    • Roxie Allen
    • [email_address]
    • St. John’s School
    • Houston, TX
    • CAST 2009
    • Galveston, TX
    • November 6, 2009
  • 3.  
  • 4. How it all began
    • Undergraduate degree in Biochemistry
    • Decision to teach in college
    • Brief Grad School
    • MDAnderson Cancer Research
    • Finally, teaching in Midland
  • 5. The early years
    • Teaching with my mentors
    • Dan Kallus
    • Ken Lyle
    • Jack Hurst
  • 6.  
  • 7. Princeton 1990
  • 8. Getting Involved Early
    • ACT 2 , ChemEd, ACS, NSTA, CAST
      • Going to Conferences
      • Newsletter Editor
      • Woodrow Wilson and Princeton
      • Presenting at Conferences
  • 9. Things I’ve gotten to do
    • Teach amazing students
    • Interact with phenomenal colleagues and friends
    • Teach preservice teachers
    • Spend summers in Colorado
    • Travel abroad and all over the US
  • 10. My favorite experiments
    • Thermodynamics Experiments
    • States of Matter Experiments
    • Covalent Bonding Experiment
    • Kinetics Experiments
  • 11. Thermodynamics Part I
    • Use principles of entropy to predict the spontaneity of a reaction
      • Students use concepts of states of matter to determine if entropy is increasing
      • Students predict if reaction may be spontaneous based ONLY on entropy
      • Students visualize in the molecular level how changing state might change order and thus influence spontaneity
  • 12. Part I Examples
    • Reaction 2:
    • Cu(s) + 2 H + (aq)  Cu +2 (aq) + H 2 (g)
    • Reaction 3:
    • Ca +2 (aq) + SO 4 -2 (aq)  CaSO 4 (s)
  • 13. Thermodynamics Part II
    • Use the principles of reaction types to predict the spontaneity of a reaction
      • Students have previously been given “rules” which govern reaction prediction
      • Consider whether reaction is single replacement, double replacement, etc.
      • Use solubility rules and reactivity series to predict spontaneity
  • 14. Part II Examples
    • Reaction 2:
    • Cu(s) + 2 H + (aq)  Cu +2 (aq) + H 2 (g)
    • Reaction 3:
    • Ca +2 (aq) + SO 4 -2 (aq)  CaSO 4 (s)
  • 15. Thermodynamics Part III
    • Student calculate  H o ,  S o , and  G o to determine the standard free energy change
    • This brings the mathematical principles into the reaction prediction
    • Students very often deal only with the math models, thinking it explains everything
  • 16. Part III Examples
    • Students calculate  rxn H o , etc for each of the reactions.
    • Some begin to contradict the predictions made in Part I and Part II.
    • Students begin to question the spontaneity
    • Students begin to wonder about the reactions
  • 17. Thermodynamics Part VI
    • Students perform the reactions in class
    • Some occur as predicted, some don’t
    • This is the macroscopic observation of the particulate theory
  • 18. Thermodynamics Analysis
    • For the analysis students write a paragraph for each reaction. They summarize the predictions and discrepancies.
    • This lab allows for all types of learners to “see” thermodynamic principles for themselves
    • This lab was originally found in JChemEd, but I’ve been unable to find a reference.
  • 19. Heat of Vaporization of Nitrogen
    • This lab was originally written as a thermochemistry lab for students to calculate the  vap H o for liquid nitrogen.
    • It is a fun lab, if you have a dewar
    • Nitrogen is fairly cheap (~$1/L) and ten liters is enough for four classes
  • 20. Heat of Vaporization of Nitrogen
    • We extended the questions to include calculations of the boiling point of nitrogen, using the experimentally determined  vap H o and a given  vap S o
    • Additionally we as questions regarding the driving forces for the reaction
  • 21. Thermodynamics Lab 2 Heat of Vaporization of Nitrogen
    • This lab is also from JChem Ed.
    • Heat of Vaporization of Nitrogen
    • Peter Hamlet
    • JChem Ed Volume 64, 1987, p.1060
    • In this experiment you will determine the boiling point of several unknown organic liquids and attempt to identify the liquid from a list of possibilities, based on measured and accepted boiling points.
  • 23. The Beral Pipet
  • 24. BP Procedure
    • Cut the tip off the pipet
    • Use a Pasteur pipet to transfer liquid to be tested to the bulb of the Beral pipet
    • Use a pin or paperclip to make a small pin-hole above the liquid level
    • Put a boiling chip in the liquid
  • 25. BP Procedure
    • Insert a thermometer or a probe
    • Lower the Beral pipet bulb into water in a beaker
    • Warm the beaker on a hot plate
    • Record the temperature as the liquid heats up.
  • 26. Phase Diagram of CO 2
    • The purpose of this experiment is to witness the melting of dry ice and use crude instruments to determine the pressure of the triple point.
  • 27. Phase Diagram of CO 2
    • Once again, a Beral pipet is used.
    • Cut off the tip.
    • Prepare a small transparent cup with tap water.
    • Grind dry ice into a fine powder.
    • Fill the base of the cut pipet with a small amount of dry ice
  • 28. Phase Diagram of CO 2
    • Use pliers to clamp the pipet closed and lower the bulb into the water in the cup.
    • Observe the dry ice carefully. As the pressure in the pipet builds, the ice will melt into a clear colorless liquid.
    • Be CAREFUL! The ice can (and will) explode the pipet, but it is ok!
  • 29. Phase Diagram of CO 2
  • 30. Molecular Modeling
    • The purpose of this experiement is to introduce students to the concepts of Lewis Dot Structures, Valence Shell Electron Pair Repulsion Theory, and Hybridization and Types of Bonds in a hands-on concrete manner.
  • 31. Molecular Modeling
    • Part I: Lewis Dots
      • I teach the students to do Lewis Dot Structures in class, then students spend the next one or two class periods working on their “25.”
      • They finish them for homework.
      • These are then graded in class during the following class period.
  • 32. Molecular Modeling
    • Part II: VSEPR
      • Models of the different possible geometries are sketched, angles are measured and students choose from a list of names to identify with each model.
      • These are corrected together
      • Students then go back to their “25” and apply the names to them for HW
  • 33. Molecular Modeling
    • Part III: Polarity
      • Students are given two sets of models: one with polar molecules and one with non-polar molecules. They sketch them all.
      • Students come up with a set of rules about what makes a molecule polar or non-polar.
      • We discuss these in class to clear up misconceptions, then students apply them to their “25.”
  • 34. Molecular Modeling
    • Part IV: Hybridization and Bond Types
      • Students sketch hybrids
      • Students sketch molecules with sigma and pi bonds
      • The sketches are discussed in class
      • Students go back to their “25” and apply the rules they’ve learned.
  • 35. Molecular Modeling
    • Foundations of Chemistry Lab Manaul (WAY out of print, but awesome labs)
    • Flinn Bonding ChemTopic Lab book has it also
  • 36. Kinetic Study
    • Investigate the factors that affect the rate of a reaction
      • Nature of reactants
      • Temperature
      • Concentration
      • Presence of a catalyst
  • 37. Kinetic Study
    • I. oxalic acid solution reacts with potassium permanganate solution
    • H 2 C 2 O 4 (aq)  CO 2 (g) + H 2 O (l) MnO 4 - (aq)  Mn 2+ (aq)
    • II. iron (II) sulfate solution reacts with potassium permanganate solution
    • Fe +2 (aq)  Fe 3+ (aq) MnO 4 - (aq)  Mn 2+ (aq)
  • 38. Kinetic Study
    • Beautiful colors
    • Concrete evidence
    • JChem Ed sometime ago!
  • 39. More and more labs
    • I could go on and on with my favorite labs.
    • I compiled labs into a lab manual, but I’ve no idea where most came from!
    • I’m happy to share labs if you want.
  • 40. Favorite Projects
    • Name that Scientist Time Line
    • Cations and Anions in Solution
    • Chem Demos aka Santa’s Science Workshop
    • Scavenger Hunt Power Point
  • 41. Favorite Demos and Activities
    • Hungry Dragon!
    • Liquid Nitrogen Ice Cream
    • Burning Paper with Steam
    • Chemical Sunset
    • Fire in the Hand!
    • Giant Bunsen Burner
    • Leaky Shower
  • 42. Fun things to do
    • Faraday Society
    • ACS Chem Clubs
    • National Chemistry Week
  • 43.
    • If you want to purchase a 2G usb from ACT 2 for $15, I’ll put my whole lab manual on it! Come to the ACT 2 Sharathon Saturday Morning
    • Email me if you want specific lab copies.
      • Roxie Allen
      • St. John’s School
      • [email_address]
  • 44. ACT 2 Presents I’m ready for the next 25 YEARS!