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Evidence Evaluation from the Crime Scene

Evidence Evaluation from the Crime Scene. CSI Agents: Salil K. Julianna I. Leah H. Kristin H. Physical Properties. A physical property is a characteristic of matter, and does not change the chemical makeup of a substance. . Example of Physical Properties. Color Odor D ensity

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Evidence Evaluation from the Crime Scene

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  1. Evidence Evaluationfrom the Crime Scene CSI Agents: Salil K. Julianna I. Leah H. Kristin H.

  2. Physical Properties A physical property is a characteristic of matter, and does not change the chemical makeup of a substance.

  3. Example of Physical Properties • Color • Odor • Density • Viscosity • Mass • Transition points • Ductility • Malleability • Texture • Conductivity, etc.

  4. Chemical Properties • A chemical property is a characteristic of matter. • It’s a property that describes a substance or substances chemical makeup. • It cannot be determined by your senses, but must be changed in some sort of chemical way. • It is an ability to react with other substances.

  5. Examples of Chemical Properties • Flammability • Combustion • Oxidation • Heat of Combustion • Electromotive • Reactivity with water • reactivity with vinegar • Reactivity with iodine • Etc.

  6. Metal Evidence Evaluation Magnetic Steel Aluminum

  7. Metal Evidence Evaluation Identity of Sample 1 is : Aluminum Supporting evidence: • Non-magnetic • Density – 2.5 g per mL • Silver colored • Mass = 3.8 grams • Length = 4.7 cm • Volume = 1.5 mL

  8. Metal Evidence Evaluation Identity of Sample 2 is : Steel Supporting evidence: • Magnetic • Color is brown • Density – 7.85 grams per mL • Mass – 2.3 grams • Volume – 1 mL • Length – 4 cm

  9. Liquid Evidence Evaluation • Evidence X- Water, Alcohol, or Vinegar • Based on the evidence and our observations, we have concluded the liquid is alcohol due to the fact that all of the test results match up exactly for the mystery liquid and the alcohol

  10. Mystery Liquid Properties Physical Properties Chemical Properties Clear Mass: 17 g Volume: 20 mL Density: 0.85 g per mL Odor is alcoholic Flammable

  11. Mystery Liquid Evidence “Burning” Water Video http://www.youtube.com/watch?v=1oeEumV7yx8 “Burning” Vinegar Video http://www.youtube.com/watch?v=6MJXOtFMTDI Mystery Liquid Video http://www.youtube.com/watch?v=a3x0UDU5zQc Burning Alcohol Video http://www.youtube.com/watch?v=_dG3OX0FFkI

  12. Powder Evidence Evaluation

  13. Summary of Findings We conclude that the materials found at the A West crime scene were: The mystery metals was: The mystery liquid was: mmmmm The mystery powder was: hjdhdh

  14. Mystery Samples

  15. Metals Identity Steel Aluminum

  16. Results

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