Science Olympiad Forensics Cheat Sheet Here

Float in: Water (1.00), 50% Ethanol (0.91), 10% NaCl (1.07) 3. Fiber Identification | Fiber | Type | Burn test | Microscopic | Solubility | |-------|------|-----------|-------------|-------------| | Cotton | Natural | Burns, paper-like odor | Twisted ribbon, lumen | 70% H₂SO₄ | | Wool | Protein | Sizzles, burnt hair | Scales, medulla | 5% NaOH (hot) | | Silk | Protein | Same, brittle bead | Triangular, no scales | Same as wool | | Nylon | Synthetic | Melts, celery odor | Smooth, round cross-section | Formic acid | | Polyester | Synthetic | Melts, no bead | Dogbone cross-section | m-Cresol | | Acrylic | Synthetic | Melts, chemical odor | Round or bean-shaped | DMF | 4. White Powder & Crystal ID (Chemical Tests) | Substance | Iodine (KI) | Vinegar (Acetic) | HCl (dil) | Flame Test | Solubility in H₂O | |-----------|-------------|------------------|-----------|------------|-------------------| | Baking Soda (NaHCO₃) | None | Bubbles (CO₂) | Bubbles | Yellow-orange | Soluble | | Cornstarch | Blue-black | None | None | Yellow | Insoluble | | Sugar (Sucrose) | None | None | None | Blue? caramelize | Soluble | | Salt (NaCl) | None | None | None | Yellow-orange | Soluble | | Epsom salt (MgSO₄·7H₂O) | None | None | None | No color | Soluble | | Plaster (CaSO₄·½H₂O) | None | None | Bubbles (slow) | Orange-red | Slightly soluble | | Borax (Na₂B₄O₇) | None | pH 9.2 (base) | None | Green (boron) | Soluble |