1. Unknown Crime Scene Evidence Identification
PBL #1
Unknown Crime Scene Evidence Identification

2. S8P1d. Distinguish between physical and chemical properties of matter
SPS2.a Calculate density when given a means to determine a substance's mass and volume
2SCI.9-12.PS.SPS6 Students will investigate the properties of solutions: (conductivity)

3. CSI agents frequently find substances and items at crime scenes and must identify them. The agents use the properties of the substances to guide them to an identity of this matter.

4. Problem Your team is being called as CSI expert witnesses at a trial
Problem Your team is being called as CSI expert witnesses at a trial. You need to prepare a presentation to prove to a jury the identity of the evidence (matter) found at a crime scene. Use your expertise of physical & chemical properties in your presentation.

5. The evidence found at the crime scene that you must identify:
A white powder
A clear liquid
A metal

6. Since you are CSIs in training, your CSI trainer has provided you with some preliminary findings.
The white powder is one of the following:
Baking soda
Baking powder
Baby powder
Cornstarch
The clear liquid is one of the following:
Water
Isopropyl alcohol
Salt water
Hydrogen Peroxide
The metal is one of the following:
Copper
Aluminum
steel
Stainless Steel

7. Your presentation must include:
The identity of each substance based on the data collected from your observations and experiments
The physical properties used to identify each
How you used the physical properties to differentiate between the possible substances
The chemical properties used to identify each
How you used the chemical properties to differentiate between the possible substances
Pictures that support your findings

8. You will be cross-examined, so be………
PREPARED!!