Science Crime Busters

1. Science Crime Busters Lin Wozniewski lwoz@iun.edu

2. Safety • Students must wear: • Closed shoes • Slacks or skirts that come to the ankles • Lab coat or lab apron • Indirect vent or unvented chemical splash proof goggles. No impact glasses or visorgogs are permitted

3. Students can bring • Spot plate or something to do reactions in • Spoon or something to get powders out • Forceps • pH paper • Magnet • Hand lens

4. Students Can Bring • Slide & cover slip • Pencil • Paper towels • 1 sheet of paper on which anything handwritten is acceptable. Sheets will be collected at the end of the event • A writing instrument • Nothing else is allowed

5. Supervisors will provide • Unknowns • Iodine Solution • 1 M HCl • Differential Density materials • Chromatography Materials • Wash bottle with Distilled or ROI water • Candle and matches • Waste Container

6. Supervisors may Provide • Microscope • Other reagents

7. Main Focus • Chemical Analysis • Polymers • Chromatography • Crime Scene Physical Evidence • How to prepare students • Resources

8. How To Prepare Students • Have students develop a dichotomous key for identifying chemicals • Practice identifying chemicals in as short a time as possible. • Practice identifying powders mixed in groups of 2 & 3 • Practice identifying plastics • Practice identifying hairs (only human, dog, cat possible) • Practice identifying fibers (only animal, vegetable, & synthetic possible)

9. How to Prepare Students • Practice doing pen chromatograms • Practice doing juice chromatograms • Practice identifying fingerprints • Practice matching DNA chromatograms/electropherograms • Practice matching shoes & tires to their tracks • Try a liquid spatter activity • Practice using a waste container

10. Resources • The National SO Website www.soinc.org • The information on my thumb drive

11. Questions? • Thank You