Often times, when collecting evidence at a crime scene, investigators may recover substances they are unable to identify in the field. Along with evidence such as fingerprints, hair, fibers, etc., there may be traces of unknown chemicals or powders left behind by the perpetrator or perpetrators. Evidence of this nature is sent to the crime lab for identification. In this experiment, you will use your observation skills, senses, and chemical tests on a series of known substances as well as two unknown substances. You will then attempt to identify the mystery substances based on your observations and recorded data. This activity includes a Teachers Manual and Student Guide and Analysis copymasters. There is enough material for 5 groups. Aligned to the Next Generation Science Standards (NGSS)* Disciplinary Core Ideas: PS1.A; PS1.B Performance Expectations: MS-PS1-2 Cross Cutting Concepts: Patterns Engineering Practices: Analyzing and Interpreting Data Kit Includes: 10 Reaction Plates 10g Baking Powder 10g Baking Soda 10g Corn Starch 10g Talcum Powder 10g Salt 10g Gelatin 10g Mystery Substance #1 10g Mystery Substance #2 10mL Biuret Reagent 10mL Dilute Lugol’s Iodine 10mL Acetic Acid DOT Info: Small quantity exemption 173.4 THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only *”Next Generation Science Standards” is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards was involved in the production of, and does not endorse, this product. WARNING: This product can expose you to chemicals including Respirable crystalline silica, which is known to the State of California to cause cancer. For more information go to http://www.P65Warnings.ca.gov.