the w. houston crime scene

THE W. HOUSTON CRIME SCENE

AVI M. TED N. NICKY R.JESSICA M.

PHYSICAL PROPERTIES

A physical property is a property that can be observed or measured without changing the composition of matter.

Examples: Color Hardness Malleability Viscosity Texture Odor Melting Point Etc.

CHEMICAL PROPERTIES

A chemical property shows the ability for a substance to react to other substances.

Examples: Corrosion Oxidation

Sample 1

Sample 2

The Metal Samples

Sample 1 Evaluation

Identity of sample 1: Aluminum Supporting evidence:

Not magnetic Silver in color Density: 2.7g/mL Doesn’t oxidize quickly Conducts electricity

www.elmhurst.edu/~chm/vchembook/102aluminum.html supports this evidence

Sample 2 Evaluation

Identity of sample 2: Steel Supporting Evidence

Magnetic Dark grey color Density= 7.8 g/cm3 Harder (Scratch Test) lower thermal conductivity

http://www.ndted.org/EducationResources/CommunityCollege/Materials/Physical_Chemical/PhysicalProperties.htm

Supports this evidence

Mystery Powder Evaluation Identity of the mystery powder:

Baking soda Supporting Evidence

Baking soda had same reactionsBaking Powder

Baking Soda

CornStarch

Baby Powder

Mystery Powder

Water Bubbled

Fizzed Water turned yellow

Repelled water

Bubbled

Vinegar

Fizzed Fizzed Turned vinegar yellow

Repelled vinegar

Fizzed

Iodine Turned black

Absorbed Iodine

Turned black

Turned black

Turned black

Mystery Liquid

Identity of the mystery liquid: Rubbing Alcohol Supporting Evidence:

Flammable Smell Cold Clear Very high viscosity

Water Rubbing Alcohol

Mystery Liquid

Conclusion

Metal Sample 1 is Aluminum Metal Sample 2 is Steel The Mystery Powder is Baking

Powder The Mystery Liquid is Rubbing

Alcohol