West Crime Scene Evidence Evaluation

1. West Crime Scene Evidence Evaluation CSI Agents: Amelia Beebe Alyssa Borko Patrick Barry Jordan Anthony

2. Physical Properties • Observations or measurements with out changing the matter’s identity • Examples: • Ductility: the ability to pull a substance into a lasting wire • Malleability: the ability to roll or pound a substance into sheets • Solubility: the ability to dissolve a substance in another substance

3. Chemical Properties • Descriptions of matter based on the ability to change into new matter with differing properties • Examples: • Flammability: the ability of a substance to burn • Reactivity: the ability of two or more substances to combine and form one or more new substances

4. Metal Evidence Samples Sample 1 2.1 cm Sample 2 3.9 cm

5. MAGNETISIM SAMPLE 1 SAMPLE 2

6. Metal Evidence Evaluation Aluminum • Identification of Sample 1: • Support: • Magnetism: When tested Sample 1 showed no sign of magnetism. • Density: The density of metal one was 1.6 g per mL, which is less dense then Sample 2. (Just as aluminum is less dense than steel) • http://www.engineeringtoolbox.com/metal-alloys-densities-d_50.html (shows that aluminum is less dense than steel in kg/mᶾ)

7. Metal Evidence Evaluation Steel • Identification of Sample 2: • Support: • Magnetism: When tested Sample 2 showed it was in fact magnetic. • Density: The density of Sample 2 was 2.3g, which is more dense than Sample 1. (Just as steel is more dense than aluminum) • http://www.engineeringtoolbox.com/metal-alloys-densities-d_50.html (shows that steel is more dense than aluminum in kg/mᶾ)

8. LIQUID SAMPLE VINEGAR ALCOHOL WATER

9. LIQUID SAMPLE

10. VINEGAR

11. ALCOHOL

12. WATER

13. MATCH LIQUID SAMPLE ALCOHOL

14. Liquid Evidence Evaluation Isopropyl Alcohol • Identification of Liquid Sample: • Support: • Flammability: When tested, the liquid sample caught fire and burned, just like the Isopropyl Alcohol. • Smell: When wafted, the liquid sample had a distinct smell identical to the Isopropyl Alcohol. http://www.chemicalkim.com/segments/take5_35.htm (proof and example that Isopropyl Alcohol is flammable)

15. LIQUID SAMPLE IODINE TEST WATER TEST VINEGAR TEST

16. BAKING SODA IODINE TEST WATER TEST VINEGAR TEST

17. CORN STARTCH IODINE TEST WATER TEST VINEGAR TEST

18. BAKING POWDER IODINE TEST WATER TEST VINEGAR TEST

19. BABY POWDER IODINE TEST WATER TEST VINEGAR TEST

20. POWDER SAMPLE BAKING SODA CORN STARTCH BAKING POWDER BABY POWDER

21. POWDER SAMPLE BAKING POWDER MATCH

22. Powder Evidence Evaluation Baking Powder • Identification of Sample A: • Support: (Reactivity with…) • Water (H₂0): When tested with water, Sample A fizzed. • Vinegar: When tested with vinegar, Sample A fizzed also giving off a bubbling sound. • Iodine: When tested with iodine, Sample A changed color to black. All tests matched the tests of the Baking Powder http://www.nowforthesciencebit.com/culinary-science/how-does-baking-powder-work (explains reaction of baking powder with liquids through baking)

23. Evidence Conclusion We conclude that… • The metals found at the crime scene was • Sample 1– Aluminum • Sample 2– Steel • The liquid found at the crime scene was • Liquid Sample– Isopropyl Alcohol • The powder found at the crime scene was • Powder Sample– Baking Powder