Your SlideShare is downloading. ×
ACT2 Presents
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Saving this for later?

Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime - even offline.

Text the download link to your phone

Standard text messaging rates apply

ACT2 Presents

313
views

Published on

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

Published in: Education, Technology

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
313
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 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
  • 22. BOILING POINTS OF ORGANIC LIQUIDS WITH PASCO PROBES
    • 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!