Question

1. terms:

vocab word | look up the definition from google or from class notes/activities | explain in your own words (7 words or less)
\graphology\ vs. \forensic document analysis\
forensic science
chromatography
rf value

1. describe what happened in the lindbergh baby case
2. describe what happened in the anthrax letter case
3. if a pigment from an ink pen travels 25mm and the solvent travels 40mm, what is the rf value? (show your work)

rf = 0.625

1. if a pigment from an ink pen travels 13mm and the solvent travels 39mm, what is the rf value? (show your work)

rf = ⅓ or 0.333

1. are the pigments from questions 4 and 5 likely to be a match? why or why not?

no, they have different values

1. how are the following people connected to the cases we covered in class?

a. charles lindbergh jr.
b. charles lindbergh sr.
c. tom daschle

Explanation:

Step1: Recall Rf - value formula

The formula for the retardation factor (Rf) is $Rf=\frac{\text{distance traveled by solute}}{\text{distance traveled by solvent}}$.

Step2: Calculate Rf for question 4

Given that the distance traveled by the pigment (solute) is $d_{solute}=25\text{mm}$ and the distance traveled by the solvent is $d_{solvent}=40\text{mm}$. Then $Rf_1=\frac{25}{40}=0.625$.

Step3: Calculate Rf for question 5

Given that the distance traveled by the pigment (solute) is $d_{solute}=13\text{mm}$ and the distance traveled by the solvent is $d_{solvent}=39\text{mm}$. Then $Rf_2=\frac{13}{39}=\frac{1}{3}\approx0.333$.

Step4: Answer question 6

Since $Rf_1 = 0.625$ and $Rf_2=0.333$, and different substances have different characteristic Rf - values under the same conditions, the pigments are not a match.

Answer:

1. $Rf = 0.625$
2. $Rf=\frac{1}{3}\approx0.333$
3. No, they have different values.