Test Review: Lab Tools and Techniques of the Forensic Scientist

Which of the following provides a “chemical fingerprint?” Any screening test Gas chromatography Mass spectrometry TLC FTIR Response Grid

Gas chromatography… Separates solids by running a thin liquid over a gas. Is a high speed separation technique. Is a confirmation test. Produces a mass spectrum. Is never used with a mass spectrometer. Response Grid

A colorimeter Is a mass spectrometer Produces a chromatogram Is the same as FT-IR Measures absorbance Is a lot like TLC Response Grid

The color of light depends on its Amplitude Wavelength/frequency Speed medium Response Grid

A test that identifies a material based on the color and shapes of crystals formed when mixed with a particular reagent is.. Microcrystalline Colorimetry Spectrophotometry Gamma testing Response Grid

In any kind of chromatography, The analyte moves through a gas. There is a mobile and a stationary phase. There are multiple components being separated. There is a positive identification of a material when done. Response Grid

A gas chromatogram shows Absolute identities of substances Peaks at times when components come together. Peaks on a graph of retention time, showing when the different components come out of the gas. Response Grid

Ability to chemically react with the solvent. When we talk about the “affinity” of a material to one phase or another, we are referring to its Ability to chemically react with the solvent. Attraction toward a particular phase Mass ratio Hatred for that particular phase. Response Grid

Color tests… are generally quantitative in nature. are usually confirmatory/definitive. provide a positive identification of a material. are considered qualitative, screening/presumptive tests. Response Grid

Beer’s Law… Is not real- our teacher made it up. Relates the distance traveled by an analyte to the distance traveled by a solvent. Compares the amount of alcohol required to intoxicate one person to the amount required for a different person. Describes the relationship between concentration and absorbance/transmittance of light through a sample. Response Grid

The use of a blank prior to completing any measurement is to Zero/calibrate the sensor Determine the mass of the material Allow the sensor to warm up Tell the computer interface the appropriate unit of measurement Response Grid

To calculate the Rf value for a particular component, you need to Measure the distance that component traveled. Measure the distance that the solvent traveled. Divide the distance traveled by the component by the distance traveled by the solvent. Divide the distance traveled by the solvent by the distance traveled by the component. Answers 1 and 2 only Answers 1,2 and 3 only Answers 1,2 and 4 only Answers 1 through 4 are all required. Response Grid

Mass spectrometers Are readily available, even in high school labs. Are used for every material identification that is attempted by a crime lab. Provide identification based on the mass and charge of a sample None of the above Response Grid

What are the three ways that someone can be poisoned? Accidental, Intentional, Deliberate Also (Routes of entry: inhalation, absorption, ingestion, injection) Response Grid

Restricted substances because of their effect on people are called __________ substances. Prohibited Controlled Schedule Destructive Response Grid

How many schedules are all drugs classified into? 1 3 5 7 Response Grid

Hallucinogens are drugs that… Reduce pain Make you see things that aren’t really there Increase energy and alertness “uppers” Relieve anxiety and make the user sleepy Response Grid

Depressants are drugs that… Reduce pain Make you see things that aren’t really there Increase energy and alertness “uppers” Relieve anxiety and make the user sleepy Response Grid

Narcotics are drugs that… Reduce pain Make you see things that aren’t really there Increase energy and alertness “uppers” Relieve anxiety and make the user sleepy Response Grid

Stimulants are drugs that… Reduce pain Make you see things that aren’t really there Increase energy and alertness “uppers” Relieve anxiety and make the user sleepy Response Grid

The most controlled and illegal substances are found in Schedule… 1 2 3 4 5 Response Grid

Cannabis is found in Schedule… 1 2 3 4 5 Response Grid

Alcohol is considered a… Narcotic Hallucinogen Depressant Steroid Stimulant Response Grid

What was the outcome of the Lime Street fire in Jacksonville, Florida. It is very easy to use v patterns and alligatoring to conclude an arson happened. That arson and accidental fires all produce the same evidence making it hard to determine the cause There is no such thing as fire; fire is a myth. Response Grid

Accelerants are… A controlled substance A substance used to clean up after evidence has been packaged A substance that accelerates the chemical break down of evidence A substance that can help start and accelerate a fire Response Grid

When a room becomes fully engulfed in flame and has inferno temperatures (800 degrees Fahrenheit) this is called: Flashdance Flashover Flashpoint Flashfire Response Grid

Dopamine and Serotonin are two important ______________in the Brain Accelerants Neurotransmitters Synapses Cells Response Grid

What is it that makes certain substances so addictive?

The toxicity of a substance depends on the dose, the duration of exposure, the nature of exposure, interactions with other substances, and the byproducts formed when metabolized.