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

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ACT2 Presents

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