Evidence Evaluation from the Olympic Village Crime Scene CSI Agents: Jackson Sevy, Alex Smolyar, Sarah Sorensen and Tessa Stanton
The Problem Problem: Identify the mystery substances found at the crime scene. Identifications: Metal A was identified as steel. Metal B was identified as aluminum. The liquid was identified as rubbing alcohol. The powder was identified as baking powder.
General Information Property: a property is a characteristic such as length (physical) or flammability (chemical.) Matter: anything that takes up space and has mass. Physical Property: a characteristic of matter such as color or odor. Chemical Property: a characteristic of matter which describes a substance’s ability to participate in chemical reactions. Chemical Reaction: a change that happens when one or more substances change into new substances with different properties.
Metal Evaluation Metal A • Mass: 2.6 g • Density:7.85g/cm³ • Dark in color • Magnetic Identity: Steel Metal B • Mass: 1.8 g • Density: 2.7g/cm³ • Metallic looking • Not magnetic Identity: Aluminum Metal Samples
Liquid Evaluation • Strong odor • Transparent • Flammable Identity: Isopropyl Alcohol Liquid Sample
Powder Evaluation Identity: Baking Powder
Evidence Summary Metal A: Steel Metal B: Aluminum Liquid: Isopropyl Alcohol Powder: Baking Powder