Crystalline, semi-opaque, NaOH forms precipitate, no Magnesium Benedicts reaction, pH= acidic, water soluble, white flame P3 Wife Sulfate, MgSO4, Epsom Salt Crystalline, white, pH=basic, odorless, reaction with NaOH or HCl creates vinegar (smell), no Benedicts reaction, Sodium Acetate, P4 Brother yellow flame C2H3NaO2 Distinct feel when mixed with water (oobleck), iodine reaction, turns clear when mixed with water and heated, P5 Cook Cornstarch powder structure, no Benedicts reaction Add 1 ½ more points if all 5 powders were correctly identified. PART B Polymers (20%) ( ____ /24) – Substance From What kind of hair is it? How did you test/observe it and what was the result? Thick, medullary index approximately 0.50, continuous Example coat Dog medulla Example sweater Human Absent medulla, imbricate scale pattern H1 Victim Human H2 Butler Cat H3 Wife Dog H4 Brother Cat H5 Cook Dog Add 1 ½ more points if all 5 hairs were correctly identified.
P3 Wife Magnesium Sulfate, MgSO4, Epsom Salt Crystalline, semi-opaque, NaOH forms precipitate, no Benedicts reaction, pH= acidic, water soluble, white flame P4 Brother Sodium Acetate, C2H3NaO2 Crystalline, white, pH=basic, odorless, reaction with NaOH or HCl creates vinegar (smell), no Benedicts reaction, yellow flame P5 Cook Cornstarch Distinct feel when mixed with water (oobleck), iodine reaction, turns clear when mixed with water and heated, powder structure, no Benedicts reaction Add 1 ½ more points if all 5 powders were correctly identified. PART B – Polymers (20%) ( ____ /24) Substance From What kind of hair is it? How did you test/observe it and what was the result? Example coat Dog Thick, medullary index approximately 0.50, continuous medulla Example sweater Human Absent medulla, imbricate scale pattern H1 Victim Human H2 Butler Cat H3 Wife Dog H4 Brother Cat H5 Cook Dog Add 1 ½ more points if all 5 hairs were correctly identified.