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Forensic Analysis > Lab Deck (Final Exam) > Flashcards

Lab Deck (Final Exam) Flashcards

1
Q

Accuracy vs. Precision?

A

Accuracy: closeness of a value to its true value

Precision: closeness of measurements to each other

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2
Q

What is the Scott Reagent used for?

A

Detecting cocaine

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3
Q

What is the Marquis Reagent used for?

A

Detecting meth

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4
Q

Are color tests presumptive or confirmative?

A

Presumptive

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5
Q

What results do color tests give?

A

Positive or negative

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6
Q

What are the 3 factors affecting the probability of drugs on currency?

A

1) Age
2) Denomination
3) Location of circulation

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7
Q

What does the R(f) in R(f) value stand for?

A

Retention (retardation) factor

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8
Q

R(f) is the ratio of…

A

Analyte distance travelled to distance solvent front travelled

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9
Q

What is the mechanism of action for paper chromatography?

A

Nonpolar solvent moves up along polar cellulose in paper via capillary action

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10
Q

Method of separating mixtures into their components based on physical and/or chemical properties of the components

A

What is chromatography?

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11
Q

What is the stationary phase in paper chromatography?

A

Paper (polar cellulose)

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12
Q

What is the mobile phase in paper chromatography?

A

Nonpolar solvent

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13
Q

Physical property of matter relating the mass of an object to its volume.

A

What is density?

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14
Q

When a substance floats…

A

Less dense than medium

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15
Q

When a substance sinks…

A

More dense than medium

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16
Q

When a substance suspends…

A

Same density as medium

17
Q

An object immersed in fluid displaces a volume of fluid equal to its value.

A

What is water displacement, or Archimedes principle?

18
Q

Comparative method stating that a solid particle will float in a liquid medium of greater density, sink in a liquid of lower density, or remain suspended in a liquid of equal density

A

What is flotation?

19
Q

Refractive index is the ratio of…

A

Speed of light in vacuum to speed of light in medium

20
Q

True or False: RI will always be greater than 1.

A

True

21
Q

If the Becke Line is inside the glass chip, then the RI of the chip is { } than the RI of the surrounding medium.

A

Greater

22
Q

What does FTIR stand for?

A

Fourier-Transform Infrared Spectroscopy

23
Q

What causes spectral peaks in FTIR?

A

Functional groups

24
Q

What is the model of the FTIR machine used?

A

Perkin-Elmer Spectrum 100 FT-IR Spectrometer

25
Q

What are the 7 main parts of the GC-MS?

A

1) Injector port
2) Oven
3) Hydrogen gas
4) Column
5) Interface (connects GC to MS)
6) Ion source
7) Bulb

26
Q

What do the peaks on a mass spectrum represent?

A

Fragment ions of varying relative abundance

27
Q

What is the model of the GC-MS used?

A

Perkin-Elmer Clarus 600 GC + MS

28
Q

What does m/z mean?

A

Mass-to-charge ratio

29
Q

What is the name of a GC graph?

A

Gas chromatogram

30
Q

What is the model of the UV-Vis spectrometer used?

A

Perkin-Elmer Lambda 35 UV-Vis Spectrometer

31
Q

What is UV-Vis used for?

A

Quantitative measurements (e.g. concentration) when the type of compound to be analyzed is known

32
Q

Shift to a longer wavelength.

A

What is red shift?

33
Q

Shift to a shorter wavelength.

A

What is blue shift?

34
Q

Why are quartz cuvettes used?

A

Quartz excels at transmitting a wide range of UV light (190 to 2500 nm)

35
Q

Why does polarity matter when choosing a solvent?

A

Polarities have to match so that signals aren’t swamped

36
Q

Why does solvent cutoff matter when choosing a solvent?

A

The solvent used must be under the wavelength at which your sample absorbs so that your solvent and sample signals don’t overlap

Forensic Analysis (18 decks)

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