Science Crime Busters B & Forensics C. NC Event Only
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1 Science Crime Busters B & Forensics C NC Event Only
2 Presenters Aarti Thakkar Student at Duke University Four-time state medalist in Forensics Competed in Forensics at National Science Olympiad Jessica Rotenberg Forensic Scientist at the North Carolina State Crime Laboratory State Event Leader for Science Crime Busters for four years Questions? Contact Jason or Kelly. If they cannot help, they will be sure to forward your to one of us.
3 Quick Reminders O As a coach, it s your responsibility that you and your student have read the directions. Many students are not able to compete for this reason. O Encourage students to not panic if they see new material in the event, it s there to challenge them. O Pay attention to the breakdown of scoring percentages, encourage students to spend more time in areas worth more.
4 Description O Given a scenario and possible suspects, teams will perform a series of tests. These tests, along with other evidence or test results will be used to solve a crime and name the perpetrator.
5 Why all the Changes? O The new format will allow the students to specialize and actually delve into specific topics as opposed to only a superficial glance at a lot of material. O The new test is written around the FBI Lab divisions, focusing on one section from Chemical Evidence Labs and two sections from the Physical Evidence Labs.
6 Safety Requirements O Safety Goggles for ALL events O Must conform to ANSI Z O Must bear Z87 or Z87+ O Types #1-5 (#5 is the most protective) O Safety Goggles for THESE events O #4 indirect vent chemical splash goggles
7 Safety Requirements Cont. O Chemical apron with sleeved OR lab coat that reaches the knees O Legs must be covered to ankles (pants or skirt, no capris) O Closed-toed shoes
8 The Competition O Three Parts O Crime Scene Chemical Evidence (50%) O Powders O Crime Scene Physical Evidence (25%) O Fibers & Glass O Analysis (25%)
9 The Competition: Part 1 O Crime Scene Chemical Evidence (50%) The FBI Chemistry Unit analyzes powders, liquids (fluids, inks/dyes, stains), and paints/polymers. The Chemical topic for 2012 is powders. There will be no mixtures.
10 O Powders Crime Scene Chemical O Identification of powders. Evidence (50%) O General Knowledge: Teams will be expected to answer questions about the tests they perform and proper lab procedure. Example questions: O If the ph of a substance is 3.5, is it acidic or basic? O What does it mean if a powder turns black in the presence of KI? O What is the proper method to smell a chemical?
11 Crime Scene Chemical Evidence Cont. (50%) O Unknown: O Unknown powder O Identify as many properties as possible O Use same testing methods as for qualitative analysis O Burn tests, ph, solubility etc. O Identification of the powder is not necessary, only analysis of its properties.
12 Crime Scene Chemical Evidence Cont. (50%) O Many supplies can be found in your home, or a friend s home (sugar, flour, etc) O The remaining powders might be found at school (sodium acetate, etc) O If unable to find one use the internet to learn what reactions might look like. (CDs available from have a video of many reactions)
13 Reagents Given For Testing O Water (BC) O Kl (Iodine) (BC) O 1M HCl (BC) O Benedict s Solution O A hot water bath O A high BTU flame source
14 The Competition: Part 2 O Crime Scene Physical Evidence (25%): O The Physical topic for 2012 is Trace Evidence. Two different types of trace evidence will be on the test. O Type 1: Fibers O For B Division: Teams must differentiate between animal, plant, and synthetic fibers (not identify specific fibers). O For C Division: Possible fibers include cotton, wool, silk, linen, nylon, spandex, polyester. O If burn tests are not permitted the event leader will provide a description of the burn test characteristics.
15 Crime Scene Physical Evidence O Type 2: Glass: Cont. (25%) O Determine the type of glass found broken at a crime scene based on characteristics such as opacity, thickness, irregularities, etc.. They may be asked to analyze which hole or fractures occurred before others based on a piece of glass available for examination or a picture of a piece of glass. O Matching based on opacity, thickness, irregularities, etc. O For C Division: Index of refraction may be used to determine the type of glass when given charts and a set of known values.
16 Competition Part 3: Analysis O Students will be asked to write an analysis of the scene explaining not only which pieces of evidence implicate which suspect and why the suspect was chosen as the culprit, but also why the other suspects were not chosen. They will also answer any other crime scene analysis questions posed by the event supervisor.
17 What s Next?
18 Practice! O Students should practice identifying powders. Help students obtain the unknown substances and help them create a plan of attack to learn how to identify them. O Students can bring a note sheet to the competition. Help students construct a great note sheet. O Students should be able to describe their findings in a thorough manner and explain how they reached that conclusion. Help students practice this skill.
19 Try It Yourself O Get together in groups of three O We will pass out the following now: O 2 Unknowns in Small Baggie O 1 Paper Plate O 2 Popsicle Sticks (for removing solids from bag) O 2 Reagents in small bottles (share, please) O While you re waiting: O Divide your plate into 4 quadrant by drawing a big X
20 Setup O Place a *tiny* bit of each unknown in the indicated quadrant. Unknown 1 Unknown 1 Unknown 5 Unknown 5
21 Testing O We tested solubility already. Here are the results. O Unknown 1: insoluble O Unknown 5: soluble (but it took a lot of stirring)
22 Testing O Use the diagram below and note the result when you add reagents to the unknowns. Unknown 1 Add HCl Unknown 1 Add Iodine Unknown 5 Add HCl Unknown 5 Add Iodine
23 Discussion O Let s discuss the results of these 4 tests. O Generate a description of your two solids that is clear and concise.
24 Ideal Answer O Unknown 1 O Unknown 1 is insoluble in water. It is bright white in color. It bubbles with the addition of HCl and displays no obvious reaction to iodine. O Unknown 5 O Unknown 5 is soluble in water but it dissolves slowly. It is off white. It displays no obvious reaction to HCl but turns purple/black in the presence of iodine.
25 Identify Your Unknowns Powder Soluble? Color React to HCl? React to Iodine? Calcium Carbonate Calcium Sulfate No White Bubble No No White No No Flour Yes Off-White No Purple/Black Cornstarch Yes White No Purple/Black
26 Identify Your Unknowns Powder Soluble? Color React to HCl? React to Iodine? Calcium Carbonate Calcium Sulfate No White Bubble No No White No No Flour Yes Off-White No Purple/Black Cornstarch Yes White No Purple/Black
27 Any Questions? O Before leaving, the cute little man has asked that you clean up for the next group. Thanks for your help!
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