Team Name: _________________________________________

Fayettville-Manlius Science Olympiad InvitationalSaturday, December 17, 2016

FORENSICSANSWER KEY

DO NOT OPEN THIS PACKET UNTIL YOU ARE INSTRUCTED TO DO SO

All answers must go in this packet. Be sure to put your team name, team code, number, and your names below. You may take this packet apart, but it is your responsibility to put it back together in

order at the end of the test. Failure to do so will result is a deduction of 5 points! A 10% penalty may be given if the area is not cleaned up as designated by the event

supervisor.

ANSWER PACKETTeam Name: Team Number:Participant Names:

Part 1: Quantitative Analysis (20 points)1

Team Name: _________________________________________Identify powders #1-8 here. Give the chemical name or formula.

PowderIdentification

chemical name OR symbol(2 pts each)

Who does this implicate?(if anyone)(1 pt each)

#1 NaClsodium chloride no one

#2 NH4Clammonium chloride no one

#3 CaCO3

calcium carbonate Joseph Johnson

#4 C6H12O6

glucose Scott Skelton

#5 cornstarch Scott Skelton

Write the balanced chemical equation representing the positive NaOH test for magnesium sulfate. (2 pts)

MgSO4(aq) + 2NaOH(aq) Na2SO4(aq) + Mg(OH)2(s)

Write the balanced chemical equation representing the positive HCl test for sodium bicarbonate. (2 pts)

NaHCO3(s) + HCl(aq) CO2(g) + H2O(l) + NaCl(aq)

Write the chemical formula for the gas that is liberated when ammonium chloride reacts with sodium hydroxide. (1 pt.)

NH4Cl(aq) + NaOH(aq) NH3(g) + NaCl(aq) + H2O(l)

2

Team Name: _________________________________________Part 2: Polymers (21 points)Identify samples #6-#8 below. #6 – used to make water bottles, 2-liter soda bottles, cooking oil bottles#7 – used in drinking cups – positive acetone test#8 – used in construction, commonly pipes – positive copper wire test

PlasticIdentification

full name OR abbreviation(2 pts each)

Who does this implicate?(if anyone)(1 pt each)

#6 PETE Joseph Johnson

#7 PS no one

#8 PVC no one

Identify hair samples #9 and #10 here.

Hair Sample Identification(2 pts each)

Who does this implicate?(if anyone)(1 pt each)

#9

dog Joseph Johnson

#10

horse no one

Identify fiber samples #11 and #12 here. You are permitted to do burn tests on theses and/or view them under the microscope.#11 –smells like burning hair when burned#12 –smells like burnt paper or leaves when burned

Fiber Identification(2 pts each)

Who does this implicate?(if anyone)(1 pt each)

#11 wool Joseph Johnson

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Team Name: _________________________________________#12 cotton Scott Skelton

Part 3: Chromatography/Spectroscopy (15 points)A. Paper Chromatography (9 points)

Consider the following chromatogram. Calculate Rf values for each of the pigments. Show all of your work below and circle your answer(s).

Blue (3 points)

3.60 cm = 0.8184.40 cm

Purple (3 points)

2.65 cm = 0.6024.40 cm

Yellow (3 points)

0.90 cm = 0.214.40 cm

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solvent front

blue

purple

yellow

origin

Team Name: _________________________________________

B. Mass Spectroscopy – 6 pointsData retrieved from Spectral Database for Organic Compounds SDBS http://sdbs.db.aist.go.jp/The oily material found at the crime was analyzed using mass spectrometry and can be found on the crime scene evidence sheet. Using the structures below, identify which structure matches the mass spectrum. Please circle your answer. (4 points)

Joan Smith

Joseph Johnson

Scott Skelton

Suspect(s) that matched the oily substance found at the crime scene (if any): __Joseph Johnson___ (2 pts)

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Team Name: _________________________________________Part 4: Crime Scene Physical Evidence (15 points)

A. Fingerprints (5 points)Below are fingerprints from both suspects. Analyze them and determine which suspect(s), if any, matches the fingerprint found at the crime scene. Consult the crime scene evidence paper for the print.

Joseph Johnson

Scott Skelton

Suspect(s) that matched the fingerprint found at the crime scene (if any): ___Scott Skelton___ (2 points)

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Team Name: _________________________________________

Look at the fingerprint below and answer the following questions.What type of ridge pattern is it? __whorl__ (1/2 point)Circle the delta(s) on the picture. (1/2 point) circled in redIdentify the minutiae patterns that are circled. (1/2 point each)

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fork (or bifurcation)

island (or short ridge)

spur (or hook)

dot (or very short ridge)

B. Blood Type (10 points)Blood was found at the crime scene that was determined to be type AB-. Blood has been collected from both suspects and the victim, which need to be typed. Please write the blood type in the box provided.

Anti-A Serum

Anti-B Serum

Anti-Rh Serum

Blood Type(2 pts each)

Joan Smith B-

Joseph Johnson O+

Scott Skelton AB-

Suspect(s) that matches the crime scene (if any): ___ Scott Skelton ____(2 pts)

Look at the following blood smears on microscope slide. Please identify the source of the blood sample. (2 pts)

___avian blood____

Part 5: Analysis of the Crime (30 points)

Team Name: _________________________________________For each of the suspects circle either “Hold for Questioning” or “Release”. In the space provided for each suspect, summarize ALL of the evidence that led you to your decision.

__________________________________________________________________________________________

Joseph Johnson Hold for Questioning Release

mass spec matched crime sceneCaCO3 matched crime scenePETE matched crime scenedog hair matched crime scenewool matched crime scene

__________________________________________________________________________________________

Scott Skelton Hold for Questioning Release

fingerprint matched crime sceneblood matched crime sceneglucose matched crime scenecornstarch matched crime scenecotton matched crime scene.

__________________________________________________________________________________________

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Team Name: _________________________________________

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