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EVIDENCE EVALUATION FROM A. WEST CRIME
SCENECSI agents: Ambree Lavelle, Lauren
Miceli, Casey Halloway
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Physical Properties An observation A physical property is any characteristics
of matter that is observable or measureable.
Ex. Color, order, texture, shape, volume, mass,weight, size, temp., BP, etc.
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Chemical Properties
Chemical properties describe matter based on it’s ability to change into new matter that has different properties.
Ability of a substance to react reactivity
Ex. Flammability, oxidize, combustibility
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Metal Evidence Evaluation
Metal 1
Metal 2
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Metal Evidence Evaluation
Identity of metal 1: steel Supporting evidence: Magnetic, thin, heavy, ductility,2.3 (mass)/1 (volume) 2.3g cm³ density, 7.83g/cm3 (internet found)
http://www.buzzle.com/articles/physical-properties-of-steel.html
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Metal Evidence Evaluation
Identity of metal 2: Aluminum Supporting evidence:Non magnetic, fat, light, formability, malleability, 1.9 g/2 cm³, .95 cm³ density (what we found), 2.7g/cm3
http://www.hydro.com/en/Subsites/NorthAmerica/Aluminum/Properties-of-Aluminum/
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Liquid Evaluation
Identity of liquid: Rubbing alcohol Evidence: smells, flammable, chemical
property, transparent, 21 cm³ (volume), 25.20 g (mass), density = 1.2 g/cm³
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Powder Evidence
Mystery powder: baking powder Evidence: reacted with iodine (black),
reacted with vinegar (white, bubbled up, air bubbles appeared), became squishy and airy with water.
Mystery powder
Baking powder
Key:1st= react with water2nd= react with vinegar3rd= react to iodine
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Summary We concluded that the metals found at
the A West crime scene were: Steel and Aluminum
The Liquid was rubbing alcohol
The Powder was baking powder