CHEM 103 LAB EXAM NEWEST 2025 EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

CHEM 103 LAB EXAM NEWEST 2025 EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ What color and what type of reaction does Baeyer's test indicate when reacted with a Alkane? - Answer- STAYs purple NEGATIVE reaction What color and what type of reaction does Baeyer's test indicate when reacted with a Alkene? - Answer- TURNS red POSTIVE reaction Bromine in CCl4 with Alkane - Answer- turns the red-orange (NEGATIVE) Bromine in CCl4 with Alkene - Answer- decolorizes (POSITIVE) Density - Answer- Mass/ Volumes Beer's law - Answer- A=ɛbc A=Absorbance Absorbance=2-log(%Transmittance) ɛ= molar absorptivity b= pathlength c= concentration What is curcumin - Answer- yellow compound present in turmeric What is used to extract yellow curcumin in Turmeric? - Answer- Isopropyl alcohol How is pH determined by using Curcumin? - Answer- Redish- BASE Yellowish- addition of ACID What is added to Tollen's test? - Answer- n-butyraldehyde What happens when Tollen's test is performed on an aldehyde? - Answer- it REACTS and turns silver What happens when Tollen's test is performed on a ketone? - Answer- NO REACTION Hydrozone derivatives formation with aldehyde - Answer- CRYSTALIZES Hydrozone derivatives formation with a ketone - Answer- CRYSTALIZES Aldehyde boiling points - Answer- LOWER than ketones (49-93 degrees C) Keton boiling points - Answer- HIGHER than aldehydes ( 94-173 degrees C) ASA SA ES Reactions - Answer- Hydrolysis: Acetylsalicylic acid (ASA) → salicylic cycle (SA) + acetic acid Esterification: Salicylic acid (SA) + ethanol → ethyl salicylate (ES) REVERSIBLE Solubility- - Answer- ability to dissolve in a solvent Evolution of CO2 (Vinegar test) - Answer- Carbonates (or bicarbonates) evolve CO2 gas upon the addition of acids like vinegar Formation of precipitate(NaOH test) - Answer- NaOH added to magnesium sulfate produces a white precipitate Indicator: Remember it is new: Universal Indicator (used instead of Anthocyanin derived from red cabbage) and has multiple colors. - Answer- Malachite - Answer- Malachite- gemstone used in small carvings Occurs with copper ore Background on malachite Synthesis of malachite - Answer- Secondary mineral - created by chemical reaction between minerals that have already formed Copper(II) carbonate hydroxide, or malachite, is a secondary mineral found with copper ore deposits. It is the product of a chemical reaction between two existing minerals, making it a secondary mineral. Historically this green gemstone could be found in jewelry, small carvings and beads. Malachite paints are found in 9th and 10th century Western Chinese paintings and European Renaissance paintings with the greens of the Sistine chapel believed to malachite. Colors of Malachite - Answer- Green blue or aqua