Forensics Ch. 5 pp 174-196 and classwork

Preliminary test used to reduce the number of possible identities of an unknown substance

• confirmation

• screening

• GC/MS

• drug

A single test that specifically identifies a substance is called a ....

• screening

• narcotic

• drug

• confirmation

This test turns purple in the presence of heroin and orange-brown in the presence of amphetamines

• Marquis

• Duquenois-Levine

• Dillie-Koppanyi

• Van Urk

• Scott

Screening test for barbiturates

• Marquis

• Duquenois-Levine

• Dillie-Koppanyi

• Van Urk

• Scott

Color test for marijuana, performed by adding a series of chemical solutions to the suspect vegetation.

• Marquis

• Dillie-Koppanyi

• Duquenois-Levine

• Van Urk

• Scott

Also known as Ehrlich’s reagent, this reagent turns blue-purple in the presence of LSD

• Marquis

• Dillie-Koppanyi

• Duquenois-Levine

• Van Urk

• Scott

Color test for cocaine

• Marquis

• Dillie-Koppanyi

• Duquenois-Levine

• Van Urk

• Scott

This test involves adding a chemical to the suspect drug on a microscope slide and examining the crystalline precipitate

• Van Urk

• Chemical test

• Microcrystalline test

• GC/MS

This lab technique separate mixtures by passing a mixture which contains the analyte through a stationary phase, which separates it from other molecules in the mixture and allows it to be isolated….

• chromatography

• spectrophotometry

• color tests

• Marquis

An analytical method for identifying a substance by its selective absorption of different wavelengths of light. Choose all that apply:

• Ultraviolet spectrophotometry

• Visible spectrophotometry

• infrared spectrophotometry

• gas chromatography