EVIDENCE EVALUATION FROM A. WEST CRIME

SCENECSI agents: Ambree Lavelle, Lauren

Miceli, Casey Halloway

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.

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

Metal Evidence Evaluation

Metal 1

Metal 2

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

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/

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

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

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