CSI Evidence Evaluation of the Grapefruit Crime Scene Agents: Peter Udall Cole Tyson Jennifer Shen Joanna Tolentino.

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Presentation transcript:

CSI Evidence Evaluation of the Grapefruit Crime Scene Agents: Peter Udall Cole Tyson Jennifer Shen Joanna Tolentino

Physical Properties Definition: Physical properties are properties of matter that can be judged by observing the matter or it’s measurements.

Examples of Physical Properties o Density: The amount of mass in a certain amount of space. o Volume: The amount of three-dimensional space in an enclosed area. o Ductility: The ability of a substance to stretch into a wire and retain it’s position. o Malleability: the ability of a substance to be pressed into sheets. o Magnetism: The ability of a substance to conduct with magnets. o Color: The pigment of an object

Chemical Properties Definition: Properties that are only observable during chemical reactions.

Examples of Chemical Properties o Oxidation: The ability of a substance to react with oxygen. o Corrosion: The breaking down of a substance based on it’s chemical surroundings. o Flammability: The ability of a substance to burn

Metal Evaluation Metal Sample 2 Metal Sample 1

Metal Evaluation Metal Sample 1Metal Sample 2 breslyn/magnets/is-aluminium- magnetic.html

Metal Evaluation Steel Aluminum

Metal Sample 1 Non-magnetic Silver in color Mass: 1.6g Volume:.5 cm3 Density: 2.7 g/cm3

Metal Sample 2 Dark grey Magnetic Mass 2.6g Volume.25cm3 Density: 7.85g/cm3

Conclusion Metal sample 1 is aluminum Metal sample 2 is steel

Liquid Evaluation The liquid was either water, liquid, or alcohol

Alcohol

Vinegar

Water

Mystery liquid

Mystery Liquid Comparison

Conclusion The liquid is rubbing alcohol.

Powder Evaluation H20VinegarIodine Baking Powder Soluble Milky substance Bubbles up Turns black Absorbent Baking Soda Highly soluble Turns Cold Bubble/explod e Stayed brown Absorbent Corn Starch Low solubility H20 slides off No bubbles Turned black Absorbent Baby Powder Hydrophobic Not soluble No bubbles Every low solubility Slides off stays brown Mystery Powder Soluble Milky substance Bubbles up Turns black absorbent

Baking Powder

Baking Soda

Corn Starch

Baby Powder

Mystery Powder

Mystery powder comparison

Powder conclusion The powder was baking powder because when it was exposed to water, vinegar, and iodine, it had the same reaction as the baking powder.