Crime Busters B Richard Ito Southern California Science

Crime Busters B Richard Ito Southern California Science Olympiad Summer Workshop, Summer 2019 Disclaimer: This presentation was prepared using draft rules. There may be some changes in the final copy of the rules.

Overview Hybrid Event: Written test on simple and/or compounds machines, with a build portion to test the ratio of three unknown masses using lever-based machines Team of up to two No Impound: ONE “ 8. 5” “ 11” Information sheet (both sides) in sealed sheet protector or laminated Eye Protection: Goggles Each team may bring only specified items. Other items not listed, including CALCULATORS, are prohibited [can be penalized [10%] Allowed : any or all of the items listed as Recommended Lab Equipment for Division B Chemistry Events, posted on soinc. org [tools hint of uses] Apron/lab coat covering skin covered from neck down to the wrist/ toes PANTS SHOULD BE LOOSE FITTING Southern California Science Olympiad Summer Workshop, Summer 2019 Machines B/C

The Competition The competiton will consist of evident from Parts 3. c-. f and analysis of the evidence Analysis or questions can only be on the evidence topics included in the competition The amount of evidence included will be accoding the table set forth in the Fnal Rules 3. C Mixture limit Regional 6 -15 State National 3. d 3. e 3. f 3. G Up to 2 solids with 5 -7 * 1 type 1 -2 topics required 10 -18 Up to 2 -4 of 2 -3 solids with * 7 -10 1 -2 types 2 -3 topics required 6 -15 Up to 2 -6 of 2 -3 solids with * 10 -7 1 -3 types 2 -4 topics required Southern California Science Olympiad Summer Workshop, Summer 2019 Machines B/C

Provided materials 2 e. The Supervisor will provide: i. iii. iv. v. Iodine reagent (KI solution) 1 M HCl Chromatography materials + containers Waste container 9 s 0 Wash bottle with distilled water ( no more than 250 ml) 2 f. The Supervisor may provide: i. Other equipment (e. g. , microscope, probes, calculator, etc. ) ii. Candle and matches if fibers given iii. Differential density solutions or other methods of determining density of polymers if plastics are given iv. Reagents to perform additional tests https: //www. soinc. org/sites/default/files/uploaded_files/2020_Chemistry_Lab_Equipment _Division_B. pdf Note the available items can give you hints with what tests are available: • conductivity meter (sugar vs. salt) [can use same from P&P/Food Science] • p. H paper (acid vs. base) • hand lens (cube crystals vs. powder) Southern California Science Olympiad Summer Workshop, Summer 2019

Scoring 3. The Competition Overview: • • • Highest score wins. No time bonuses 3. c. [Quantative Analysis] = 50% 3. d. [Polymer Testing/Natural and Man-made Substances]= 10% 3. e [Paper Chromatography]= 5% 3. f. [Crime Scene Physical Evidence]= 10% 3. g. [ANALYSIS] = 25% Tiebreakers • Part 3. g [ANALYSIS] • Part 3. c [Quantative Analysis] ; and • 3. d [Polymer Testing/Natural and Man-made Substances]in that order Penalties • A penalty up to 10% may be given if the area is not cleaned up as instructed by the event supervisor • A penalty up to 10% may be given if the team brings prohibited lab equipment to the event Southern California Science Olympiad Summer Workshop, Summer 2019

3. c. 50% Qualitative Analysis (What evidence): § Participants will identify evidence (unknowns) by performing tests such as solubility, acidity, magnetic property, color, density and odor § Each team will have the same set of unknowns (evidence) § The scenario will identify which containers hold mixtures and if the mixtures are made of two or three materials LIST of Materials SOLIDS: Anhydrous sodium acetate, yeast, vitamin C (ascorbic acid), *calcium Carbonate (powdered limestone), *Table salt (Na. Cl), *sugar (crystal), *flour, *calcium sulfate 2 H 2 O (gypsum), *cornstarch, *baking soda, *powdered gelatin, *Powdered Alka. Seltzer, *Sand (white) NON-POWDERED METALS: Aluminum, iron, zinc, magnesium, copper, tin LIQUIDS: lemon juice, rubbing alcohol (isopropyl), household ammonia (3%) water, Vinegar, hydrogen peroxide (3%) You provide the QA steps for your students to distinguish between each of the above, e. g. , drops of HCl on unknown sample resulting in immediate fizzing of unknown is probably X See https: //scioly. org/wiki/index. php/Crime_Busters Charts Southern California Science Olympiad Summer Workshop, Summer 2019 Machines B/C

3. d [Polymer testing / Natural and Man Made substances] Participants will demonstrate their skill in analyzing evidence from a variety of sources, such as i. ii. Hair - the difference between human, dog, and cat; not specific types of hair [Have students distinguish between the different types (magnifying glass? ) Fibers – the difference between animal, vegetable, and synthetic; not specific kinds of fibers [Have students distinguish between the different types (note flame test reference in the rules) Southern California Science Olympiad Summer Workshop, Summer 2019

3. e Paper Chromatography Participants will analyze evidence from paper chromatography (ink pens juices, kool-said, etc. ) the paper chromatography will be collected with the score sheet. No calculations are expected to be performed [suggests being able to distinguish between items and not necessarily how different they are…polar vs. non-polar, traveled further on the chromatogram not necessarily how far] Southern California Science Olympiad Summer Workshop, Summer 2019

3. F Crime scene Physical Evidence Participants may be asked to identify different patters on: i. fingerprint evidence such as the difference between whorls, loops, and arches ii. DNA evidence: participants may be asked to compare DNA chromatograms/Electropherograms from materials found at the scene to those of the suspects iii. Shoeprints and Tiretreads: Participants may be asked to compare print and make conclusions such as direction and speed of travel, No calculations are expected to be performed [balls of feet or heel-toe] iv. Soil: Participants may be given the composition of soil found at the scene or on the suspects and asked to determine if this implicates any of the suspects v. Spatters: Analyze spatterns for speed and direction of impact. No calculations are expected to be performed Southern California Science Olympiad Summer Workshop, Summer 2019

Penalties /Deductions • A penalty up to 10% may be given if the area is not cleaned up as instructed by the event supervisor • A penalty up to 10% may be given if a team brings prohibited lab equipment to the event Southern California Science Olympiad Summer Workshop, Summer 2019

TIPS 1 [from State Summer Workshop Info Meetings summer 2019] • Establish a flow…. if A then B, for analysis • Good teams know the procedure without going to cheat sheet • In order of importance: • • • ANALYSIS Chromatography Fingerprints + DNA Powders Everything else Southern California Science Olympiad Summer Workshop, Summer 2019 Machines B/C

TIPS 2 Quantative analysis [get the evidence] Practice : good teams can look and cut it down to a few Practice efficiency: use 3 drops of water/efficient use p. H / conductivity meters Flame test : ask the web-site Analysis [use the evidence]: § § § looking for specific evidence / connect the dots Can use bullet points instead of essay format Discuss every suspect: guilty or not guilty and why Consider all the evidence Consider all the alibis and motives Leave time to do analysis, at least 20 minutes Southern California Science Olympiad Summer Workshop, Summer 2019

Resources • soinc. org (Science Crimebusters CD; Science Crimebusters Manual) • Scioly Wiki (older event) • https: //scioly. org/wiki/index. php/Crime_Busters [Really good description of event/tasks] Old forums on scioly. org might be helpful for questions and reference to the older version of event • https: //scioly. org/forums/viewtopic. php? f=173&t=5023 Southern California Science Olympiad Summer Workshop, Summer 2019 Machines B/C