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postlabquestions2 - 5 A liquid that has a density of 0.80...

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Chemistry 115 – Laboratory #2 – Identification of Substances by Physical Properties Post-Lab Questions Date: 9/13/07 Name: James Anders Section: 11 Room: _______ Score: ________ [Score = ((# of points correct out of a possible 33 / 33 x 100%] 1. Is p-toluidine a solid or a liquid at room temperature (1 point)? Solid 2. What solvent would you use to measure the density of cadmium nitrate (2 points)? Cyclohexane 3. Convert your densities to kg/L and compare them to the ones in g/mL (1 point)? Solid: 1.22 g/mL & 1.22 kg/L Liquid: 0.96 g/mL & 0.96 kg/L They are the same because ethe conversion factors are the same from g to kg and from mL to L. 4. If air bubbles were trapped in your solid beneath the liquid level in your density determination, what error would result in the volume measurement (1 point)? What would be the effect of this error on the calculated density (1 point)? The graduated cylinder would read more volume than what was put in it. This would result in a smaller density than actual.
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Unformatted text preview: 5. A liquid that has a density of 0.80 ± 0.01 g/mL is insoluble in cyclohexane. What is the liquid (1 point)? Propionaldehyde 6. A liquid unknown was found to be insoluble in water and soluble in cyclohexane and alcohol. The unknown was found to have a boiling point of 57 ○ C at 658 mm Hg. What is the substance (1 point)? Choloform 7. What is the boiling point of toluene at 600 mm Hg (2 points)? 87.6 degrees C Consult a handbook for the following questions and specify which book you used. Handbook: CRCPress Periodic Table Online 8. Osmium is the arguably the densest element known. What are its density and melting point (in Kelvin) (2 points)? What is Osmium’s closest competitor when it comes to being the densest element (1 point)? Melting Point: 3306 degrees K Density: 22.587 g/cubic cm Closest Density: Iridium 9. What are the formula, molar mass, and color of potassium permanganate (3 points)? Formula: KMnO4 Molar Mass: 158.04 g/mol Color: Shiny Black...
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