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Copy of Forensics in Chemistry: The Murder of Kirsten K.
Transcript of Copy of Forensics in Chemistry: The Murder of Kirsten K.
Forensics in Chemistry:
The Murder of Kirsten K.
Crime Scene Analysis
Empirical formula calculations are used to match crime scene chemicals to a chart of chemical formulas.
Chemicals found on each suspect are matched to those found at the crime scene.
PA #2: The Chemical Evidence
design your own project
Power Point mania
Court Case Chaos
PRISM-Partnerships for Research in Science and Mathematics Education
need for chemistry forensics
Performance Assessments and Backwards Design
By: Sara McCubbins and Angela Codron
PA #3: Nuclear Radiation Evidence
What is it?
A year-long forensics-based chemistry curriculum where students collect data and evidence throughout five different performance assessments and assemble it to solve the case by the end of the year.
PA #1: The Cooler and Car Evidence
Students use knowledge of density to design a procedure to determine which lake/creek sample the blue plastic cooler pieces are from based on the ability of those pieces to float.
Students use gas laws to determine details surrounding airbag deployment from the victim's delivery truck and whether it can be removed safely without destroying evidence.
PA #4: The Weapon Analysis
PA #5: The Drug Lab Evidence
Find the solution that works best for your class and your students!
Victim: Kirsten K.
does cake decorating on the side
married to Larry J.
Suspect #1: Harold M.
works at the lakehouse owned by Gladys V.
Suspect #2: Gladys V.
owns a lake house where Kirsten and Larry vacation
Suspect #3: Elizabeth G.
owns a wedding cake business
neighbor of Kirsten and Larry
Suspect #4: Larry J.
husband of the victim
has had drug problems in the past
In performance assessment #4, Larry J. becomes the 2nd victim and a new suspect, Gerald V., is added.
density, data interpretation, dimensional analysis (unit conversions), gas laws, kinetic molecular theory, surface tension.
empirical formula, percent composition, stoichiometry, mole to gram calculations, limiting reactant, percent yield.
Amounts of chemicals found at the scene and on the suspects are converted to moles using molar mass calculations.
Cake Shop Conversions
Limiting reactant, theoretical yield, and % yield are used to calculate specifics about chemicals used at Elizabeth G.'s wedding cake shop.
concentration, molarity, Beer's Law, half-life calculations, carbon dating, radioactive decay, nuclear equations.
Part One: Nitrate Soil Analysis
Spec-20s and absorbance data are used to determine concentration of suspect samples to see if they match soil samples from the crime scene.
Shoeprints from each suspect are dusted, lifted, and preserved, then matched to evidence at the crime scene.
Half-life calculations will be used to determine the age of each of the bone fragments found at the crime scene.
Part Four: Medical Tracer
Students use half-life calculations to determine a timeline of the victim's death based on the amount of decay of a medical tracer found in her body.
Part One: Fingerprints
Match fingerprints to records to see which suspect's prints are on the various gun handles.
use school resource officer to introduce new victim and suspect.
Use electrochemistry and electic potentials to determine which bullet matches which guns.
electrochemistry, redox reactions, titrations, molarity, stoichiometry, pH, acids and bases.
Part Three: Gun Shot Residue
Students do titrations of suspect samples to determine which had a high enough acid concentration to be considered gun shot residue.
Part Four: Blood Analysis
Using pH and pOH calculations, students determine which samples on each suspect are blood, and whose blood it is.
IR spectra, organic functional groups, thin layer chromatography, Rf values, solvents and solutions.
Part One: IR Spectra
Identify IR spectra of drugs found in the lakehouse based on functional groups.
Extract caffeine from coffee to determine total amount of caffeine in confiscated amount from the lakehouse basement.
Part Three: TLC of Unknown Drug
Students use TLC to determine components present in the unkown drug found at the crime scene.
Part Four: TLC of Pens
Students use TLC to determine which pens found on the suspects match ink found in the drug logbook.