Science Olympiad Nationals 2014 University of Central Florida

Transcription

1 Science Olympiad Nationals 2014 University of Central Florida Crime Busters Do Not Open this Pac Until Directed To Do So Place all answers on the Answer Sheets provided. Point values are provided on the Answer Sheet. Crime Busters N2014 1

2 Case#: It was a break in at the local school; they were looking for something. Summary of Suspect Interviews Name: Fred; 8 th grade Statistics Vitae: male / 5 4 / 115 lbs. / African American / brown / brown / size 9M shoe / pet = cat Student is often late to school; has numerous discipline referrals (mostly for disrupting class). Wears Jeans and t shirt every day Name: Phyllis; 7 th grade Statistics Vitae: female / 5 6 / 110 lbs. / Caucasian / brown / brown / size 6M shoe / pet = cat Student is a member of Student Government but has recently been placed on probation with the student governing body because she missed the last several meetings. Teachers have commented that her grades are slipping. Student s parents have voiced concern over her new group of friends. Is obsessed with silk running suits; will wear nothing else Name: Joe; 7 th grade Statistics Vitae: male / 5 2 / 95 lbs. / Caucasian / green / blonde / size 5M shoe / pet = dog Student has recently moved to the area and has been attending school for 2 weeks. No paperwork from the previous school has been received yet. Student has been quiet and reserved; is usually setting alone in the Library or Café. Seems stuck on the 70 s; loves to wear polyester leisure suits. Exhibit Description Exhibit Description A Powder from A N Liquid from N B Powder from B M Liquid from M C Powder from C N Liquid from N D Powder from D O Liquid from O E Powder from E P Powder from Fred s shoes F Powder from F Q Powder from Phyllis shoes G Powder from G R Powder from Joe s shoes H Powder from H S Hair from Edge of Aquaium I Powder from I FP1 Fingerprint from Chef s Classroom door J Powder from J FP2 Fingerprint from Faculty Lounge door K Powder from K FP3 Fingerprint from water bottle at S L Powder from L T Chromostrip of ink extracted from note on hall wall M Liquid from M U Chromostrip of ink extracted from note on whiteboard V Fiber from door jamb at K Crime Busters N2014 2

3 Part 1 Qualitative Analysis of Powders Identify Exhibits A through L and P through R. Record your answers on the Answer Sheet provided. Place your answer to each of the following questions on the Answer Sheet provided. 1. What effect will salt have on the ph of dh 2 O? 2. Which of the allowed powders is the primary component of both school chalk and Tums? 3. Which of the allowed powders is commonly used in those insta hot warming packets that you slam to activate? 4. Baking soda is often used while baking cakes and cookies. With what type of ingredient does baking soda react to accomplish its required task? 5. What is the common name of (C 6 H 11 O 5 ) X? 6. The activity of Alka seltzer is given by the chemical equation C 6 H 8 O 7(aq) + 3NaHCO 3(aq) 3H 2 O (l) + ~~~ + Na 3 C 6 H 5 O 7(aq) What is ~~~? Crime Busters N2014 3

4 Part 2 Qualitative Analysis of Liquids Identify Exhibits M through O. Record your answers on the Answer Sheet provided. Place your answer to each of the following questions on the Answer Sheet provided. 1. Which of the allowed liquids is the most basic? 2. Which of the allowed liquids is the most acidic? 3. Which of the allowed liquids fizzes when used to clean a cut? 4. Which of the allowed liquids has a ph similar to dh 2 O? Part 3 Hair Identify Exhibit S. Record your answers on the Answer Sheet provided. Place your answer to each of the following questions on the Answer Sheet provided. 1. To whom singular or plural, if anyone dos this hair most likely belong? 2. What is the medullary index threshold for determining if a hair is human? 3. Is your threshold answer from #2 a minimum or maximum? 4. What is the single most obvious distinguishing characteristic for differentiating between cat and dog hair? Part 4 Fibers Classify Exhibits V and W as animal, vegetable, or synthetic. Two micrographs are provided below. Classify each as animal, vegetable, synthetic Name the first man made synthetic fiber. Crime Busters N2014 4

5 Part 6 Chromatography/Spectroscopy The finished chromatograms for the markers collected from each of the three students are shown in Appendix A. Run chromostrips T and U. Attach the finished chromatograms to the Auxiliary Answer Card. Use the diagram below to answer questions 1 and 2. Place your answers on the Answer Sheet provided. 1. Which pigment was most attracted to the mobile phase? 2. What is the R f of pigment #2 (green)? a) 6.50 / 3.50 b) 6.50 / 4.00 c) 6.50 / 4.50 d) 6.50 / 1.0 e) 3.50 / 6.50 f) 4.00 / 6.50 g) 4.50 / 6.50 h) 1.0 / 6.50 i) 6.50 / 1.00 j) 1.00 / Which suspect pen most likely was used to write the note on the white board? 4. Which suspect pen, if any, best matches the pen found in hall? Part7 Fingerprint Analysis The fingerprint records of each suspect are provided in Appendix B. Exhibit FP1 is shown at right. To whom does it belong? Exhibit FP2 is shown at right. To whom does it belong? Exhibit FP3 is shown at right. To whom does it belong? FP1 FP2 FP3 Crime Busters N2014 5

6 Using the NCIC classifications, identify the fingerprint type of each of the following fingers. Place your answer to each of the following questions on the Answer Sheet provided. 1. Fred s left middle finger. 2. Phyllis right index finger. 3. Joe s right middle finger. Part 8 Tracks Pictures of the shoes the students were wearing are shown in Appendix C. From Right as exiting Home Economics room. From the Economics room doorway. From Right as exiting Home Economics room. From Left as exiting Faculty Lounge. 1. Which student(s) left tracks as he/she/they left the Home Economics room? Crime Busters N2014 6

7 Part 6 Spatter A one to one photograph of spatter from Location N is shown below overlaid on a reference grid. Each spot has also been lettered for reference. Note: The scale on the grid is for reference only and is not intended to imply measurements in any specific unit. 1. From what grid reference did the spatter most likely originate? Record your answer in the form (X, Y) to the nearest ½ grid. 2. Which spot was traveling the most horizontal when striking the floor? 3. Support your answer to #2. Crime Busters N2014 7

8 Analysis of the Crime 1. Based upon the physical evidence analyzed and information collected, who most likely made the tracks originating at Kitchen 2? Support your answer. 2. Based upon the physical evidence analyzed and information collected, who most likely made the tracks originating at the Home Economics room storage cabinets? Support your answer. 3. Based upon the physical evidence analyzed and information collected, who most likely made the tracks originating in the Faculty Lounge? Support your answer. 4. Based upon the physical evidence analyzed, who most likely kicked the hole in the end cabinet in Kitchen 2? 5. What evidence (not already collected) would help determine who wrote the note in the hall? 6. Cite another piece of evidence that should/could have been collected. Explain how this evidence would be used to either prove a suspect s guilt or exculpate a suspect. Crime Busters N2014 8