2013 Forensics Test. Clio Invitational

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1 2013 Forensics Test Clio Invitational

2 1) Label the correct parts of a hair shaft below using three of the following terms: a. Medulla b. Cuticle c. Follicle d. Cortex e. Dermal papilla 2) The roots of a hair sample are very distinguishing between humans and animals. Label each of the following pictures of hair roots as either human or animal. Each choice will be used once. 3) You have three fibers and perform burn tests on all three. The results are seen below. Fiber A Not Self-Extinguishing Burns and chars Odor of burning paper Creates a soft, gray ash Fiber B Self-Extinguishing Burns briefly and melts Odor of celery Creates a hard gray bead Label each fiber using options from the following list (only three fibers will be used, non will be doubled up). Cotton, wool, silk, linen, nylon, spandex, polyester Fiber C Not self-extinguishing Burns and chars Odor of burning grass Creates a soft, gray ash

3 4) Luminol is a chemical used by crime scene investigators to identify blood stains. What is the chemical formula for luminol? (circle the correct answer) C 25 H 31 N 3 C 8 H 7 O 3 N 3 C 9 H 6 O 4 C 5 H 5 NO 2 5) In order to obtain a strong glow so that the blood stains are easily seen, luminol requires a catalyst to accelerate the chemical reaction that occurs between luminol and hydrogen peroxide. What is the catalyst in this case? (circle the correct answer) Iron in hemoglobin Antibodies attached to RBC s Cryoprecipitated Antihemophilic Factor (AHF) in plasma Fibrinogens in blood plasma 6) What is the most common blood type? 7) What is the least common blood type? 8) Complete the following chart by entering yes or no in each box. ABO Blood Type A B O AB Antigen A Antigen B Antibody Anti-A Antibody Anti-B 9) Given the pictures below, identify which blood spatters would be formed at low, medium and high velocity. Each choice will be used once.

4 A B C D E F G 10) What type of fingerprint is seen above? Match the points on the fingerprint with the name of the characteristic below: 11) Delta 12) Pore 13) Ridge ending 15) Crossover 16) Core 17) Island 14) Bifurcation Answer each of the following as true or false. 18) There is no established link between the fingerprint patterns of a child and that of their parents. 19) There is no known method of determining the age of a latent print. 20) A ridge that is thinner and shallower than those surrounding it may be termed incipient. 21) The fingerprinting acronym ACE-V stands for analyze, collect, evaluate, and verify. 22) Which of the following is not a method for collecting latent prints? (circle the answer) Fluorescent powders Leuco Crystal Violet Cyanoacrylate Ninhydrin

5 Answer each of the following as true or false. 23) The difference between HDPE and LDPE is in the amount of crosslinking between the polymer chains. 24) PETE is a condensation polymer. 25) From the following list of polymers, circle those that are thermoplastics: PETE PS PC PMMA PVC PP LDPE HDPE 26) Draw the repeating unit of polypropylene. 27) If a body is found and only blowfly eggs (no larva or pupa) are present, what is the maximum amount of time that has passed since the victim was killed? (circle the best answer and assume that adult blowflies found the body immediately.) 2 hrs 24 hrs 3 days 10 days 14 days 28) Put the following in order of appearance should a corpse sit undiscovered long enough. a. Beetles b. Blow Fly c. Moth Larvae,,

6 29) What is the most likely molar mass of this chemical compound? 30) What is the m/z value of the base peak? 31) The pattern shown by the peaks identify specific parts of the compound. What is the probable molecular formula for this compound? 32) If the mobile phase in a chromatography experiment moved 15 cm and R f value of one of the compounds in the mixture was 0.85, how far would the compound move on the paper? 33) In paper chromatography, what is the stationary phase (be specific)? 34) Which particle would show the greatest deflection in a mass spectrometer? (circle the correct answer) CH3 + C 2 H 5 + OH + C 2 H 5 2+ CH 3 2+

7 35) DNA evidence was collected from a crime scene as well as from the victim. DNA evidence was also collected from Tyler, Janet and Amanda. Analyze the evidence below and determine if any of the suspects are the guilty party.

8 36) A set of shoe prints was found at the scene of a crime and photographed. The soles of the shoes of four suspects were also photographed for comparison. IF one of the shoes matches, circle the name of the appropriate suspect above the photograph. If none of the shoes match, write No Match on the page.

9 37) Which of the following is used to detect glucose in a solution? (circle the correct answer) Hydrochloric acid Benedicts solution Sodium hydroxide Iodine Match the color of the burning chemical with the chemical that most likely produced it: 38) Sodium a) faint green flame 39) Lithium b) yellow flame 40) Potassium c) light purple flame 41) Boric Acid d) red flame 42) Calcium e) bright green flame 43) Ammonium Chloride f) yellow-red flame

11 2013 Forensics Test Clio Invitational

12 1) Label the correct parts of a hair shaft below using three of the following terms: a. Medulla b. Cuticle c. Follicle d. Cortex e. Dermal papilla D A B 2) The roots of a hair sample are very distinguishable between humans and animals. Label each of the following pictures of hair roots as either human or animal. Each choice will be used once. ANIMAL HUMAN 3) You have three fibers and perform burn tests on all three. The results are seen below. Fiber A Not Self-Extinguishing Burns and chars Odor of burning paper Creates a soft, gray ash Fiber B Self-Extinguishing Burns briefly and melts Odor of celery Creates a hard gray bead Label each fiber using options from the following list (only three fibers will be used, none will be doubled up). A Cotton B Nylon C - Wool Fiber C Not self-extinguishing Burns and chars Odor of burning grass Creates a soft, gray ash

13 4) Luminol is a chemical used by crime scene investigators to identify blood stains. What is the chemical formula for luminol? (circle the correct answer) C 8 H 7 O 3 N 3 5) In order to obtain a strong glow so that the blood stains are easily seen, luminol requires a catalyst to accelerate the chemical reaction that occurs between luminol and hydrogen peroxide. What is the catalyst in this case? (circle the correct answer) Iron in hemoglobin 6) What is the most common blood type? O + 7) What is the least common blood type? AB (+1 EC if they put AB-, tiebreaker #2) 8) Complete the following chart by entering yes or no in each box. ABO Blood Type Antigen A Antigen B Antibody Anti-A Antibody Anti-B A Y N N Y B N Y Y N O N N Y Y AB Y Y N N 9) Given the pictures below, identify which blood spatters would be formed at low, medium and high velocity. Each choice will be used once. (high, low, medium) HIGH LOW MEDIUM

14 10) What type of fingerprint is seen above? loop Match the points on the fingerprint with the name of the characteristic below: 11) F Delta 12) G Pore 13) D Ridge ending 15) A Crossover 16) B Core 17) E Island 14) C Bifurcation Answer each of the following as true or false. 18) F There is no established link between the fingerprint patterns of a child and that of their parents. 19) T There is no known method of determining the age of a latent print. 20) T A ridge that is thinner and shallower than those surrounding it may be termed incipient. 21) F The fingerprinting acronym ACE-V stands for analyze, collect, evaluate, and verify. 22) Which of the following is not a method for collecting latent prints? Fluorescent powders Leuco Crystal Violet Cyanoacrylate Ninhydrin

15 Answer each of the following as true or false. 23) F The difference between HDPE and LDPE is in the amount of crosslinking between the polymer chains. 24) T PETE is a condensation polymer. 25) From the following list of polymers, circle those that are thermoplastics: PETE PS PC PVC LDPE HDPE 26) Draw the repeating unit of polypropylene. (tie breaker #1) 27) If a body is found and only blowfly eggs (no larva or pupa) are present, what is the maximum amount of time that has passed since the victim was killed? (circle the best answer and assume that adult blowflies found the body immediately.) 24 hrs 28) Put the following in order of appearance should a corpse sit undiscovered long enough. a. Beetles b. Blow Fly c. Moth Larvae B, A, C

16 29) What is the most likely molar mass of this chemical compound? 86 30) What is the m/z value of the base peak? 57 31) The pattern shown by the peaks identify specific parts of the compound. What is the probably molecular formula for this compound? hexane 32) If the mobile phase in a chromatography experiment moved 15 cm and R f value of one of the compounds in the mixture was 0.85, how far would the compound move on the paper? (2 pts, subtract ½ pt for no unit) 15 x 0.85 = cm 33) In paper chromatography, what is the stationary phase (be specific). water (in the paper fibers) (1 pt for water, 1 pt for paper fibers, tiebreaker #3) 34) Which particle would show the greatest deflection in a mass spectrometer? (circle the correct answer) CH 3 2+

17 35) DNA evidence was collected from a crime scene as well as from the victim. DNA evidence was also collected from Tyler, Janet and Amanda. Analyze the evidence below and determine if any of the suspects are the guilty party. (Tyler)

18 36) A set of shoe prints was found at the scene of a crime and photographed. The soles of the shoes of four suspects were also photographed for comparison. IF one of the shoes matches, circle the name of the appropriate suspect above the photograph. If none of the shoes match, write No Match on the page. (Murphy)

19 37) Which of the following is used to detect glucose in a solution? (circle the correct answer) Benedicts solution Match the color of the burning chemical with the chemical that most likely produced it: 38) B Sodium a) faint green flame 39) D Lithium b) yellow flame 40) C Potassium c) light purple flame 41) E Boric Acid d) red flame 42) F Calcium e) bright green flame 43) A Ammonium Chloride f) yellow-red flame

Forensics Exam. Princeton Science Olympiad Invitational

Forensics Exam. Princeton Science Olympiad Invitational TEAM NUMBER Page 1 Team Number: Team Name: Participant names: 2016-2017 Forensics Exam For Office Use Only: Part 1: / 42 Part 2: / 41 Part 3: / 32 Part 4: / 18 Part 5: / 12 Part 6: / 24 Part 7: / 8 Part