Instruments
Geometry + Polarity
Reactions
(Type+Balance)
Forensic Principles
Lab + Poisons
100
This microscope allows forensic scientists to simultaneously view a crime scene sample and a known quantity.
What is a comparison microscope
100
H2O
What is H-O-H, 2LP, BENT geometry, POLAR
100
(CHEMICAL OR PHYSICAL CHANGES?)

(A) Gasoline is dangerous because it easily evaporates to fill a given space with flammable vapors.

(B) Carbon monoxide kills by bonding irreversibly to red blood cells.

(C) Ink moves up the paper during TLC.

What is (A) physical; (B) chemical; (C) physical
100
Unlike eyewitness accounts, most physical evidence handled by forensic scientists is of this type, which requires inference to be related to a crime.
What is CIRCUMSTANTIAL evidence.
100
Luminol uses this phenomenon to glow in the presence of blood without the need for an outside light source.
What is chemiluminescence
200
This type of analysis uses electrons to bombard a sample until it breaks up into smaller, charged, pieces.
What is mass spectrometry
200
CO2
What is O=C=O; LINEAR geometry; NONPOLAR
200
carbon dioxide + carbon → carbon monoxide
What is CO2 + C → 2CO (SYNTH rxn)
200
The phenomenon where exaggerated portrayal of forensic science in popular media influences public perception
What is "the CSI effect"
200
This type of molecule can be used to determine the pH (acidity) of a solution.
What is an INDICATOR
300
This type of instrument measures the energy that is absorbed by molecules and causes bond vibrations.
What is infrared spectrometer
300
SF6
What is OCTAHEDRAL geometry; NONPOLAR
300
HNO3 + Al(OH)3 → Al(NO3)3 + H2O
What is 3HNO3 + Al(OH)3 → Al(NO3)3 + 3H2O (DOUBLE DISPLACEMENT rxn)
300
The reason biological samples are often thoroughly dried out prior to storage.
What is "moisture (water) can catalyze the breakdown of the samples"
300
Thinking about the thermodynamics lab, this would be expected of a system where dissolved citric acid recrystallized into solid from solution (the opposite of dissolving solid into water).
What is release heat (an exothermic reaction)
400
This type of spectroscopy can be used to quantify elements in a sample, by measuring the absorbance of samples that have been vaporized.
What is atomic absorption spectroscopy
400
SO3
What is (1 added double bond); TRIGONAL PLANAR geometry, NONPOLAR
400
copper + silver(I) nitrate → copper(II) nitrate + silver
What is Cu + 2AgNO3 → Cu(NO3)2 + 2Ag (SINGLE DISPLACEMENT rxn)
400
"The skin under the victim's fingernails is female, which rules out Franklin as a suspect," is an example of this kind of evidence.
What is EXCLUSIVE evidence.
400
This is the reason radium is so deadly when ingested.
What is "radium mimics calcium, is metabolized to the bones, and releases alpha radiation that slowly kills from within"
500
This microscope fires an electron gun at a sample and can provide highly magnified information about the internal composition.
What is TEM (transmission electron microscope)
500
ICl3
What is 2LP on I; T-SHAPED geometry; POLAR
500
lead(II) nitrate → lead(II) oxide + nitrogen dioxide + oxygen gas
What is 2Pb(NO3)2 → 2PbO + 4NO2 + O2 (DECOMPOSITION rxn)
500
The last step of evidence procedures is to find a common source, called this
What is INDIVIDUALIZATION
500
The reason why methanol is so effective at denaturing alcohol (ethanol).
What is "the strong polar hydrogen-bonding between the similar molecules; hard to separate them"
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