1. Density of Water: Mass of 100-mL

1. Density of Water: Mass of 100-mL grad cylinder + water _______________ Mass of empty 100-mL grad cylinder _______________ Mass of water used _______________ Density of water _______________Get your results and calculations checked before moving on. 2. Crime Solver If you were reporting forensic results in court, you would want to be sure of your results. What is one easy way to increase the certainty of your results and ensure a mistake in your measurement did not influence your match? (Assume lake data is well known.) Forensic Sample ID _______________ Mass of 10-mL grad cyl + Forensic Sample _______________ Mass of empty 10-mL graduated cylinder _______________ Mass of Forensic Sample used _______________ Volume of Forensic Sample used _______________ Density of Forensic Sample _______________ Location of drowning _______________ 3. Density of a Solid If you had a piece of your unknown solid that weighed 5.00 g, what would its volume be in cm3? Solid ID # _______________ Mass of solid _______________ Volume in 25-mL grad cylinder w/solid & water _______________ Volume in 25-mL grad cylinder w/water only _______________ Volume of solid _______________ Density of solid _______________ 4. Flame Tests (don’t burn stick! Rinse in sink and reuse): Record the observed characteristic flame colors: Ca ________________ Na ________________ Cu ________________ *K ________________ Sr ________________ *Ba _____________________ Additional instructions from the student: Measurements & Flame Tests Objectives To introduce students to scientific measurements for length, mass, and volume commonly taken in the chemistry lab To help students understand precision and accuracy when taking measurements To review significant figures with calculations To learn the calculated measurement, density To observe characteristic flame colors for various metal compounds Pre-lab Exercises Review information about making measurements with the proper number of significant figures. Review information about doing calculations with the correct number of significant figures. Review information about the density equation. Answer the Pre-lab Exercises on the lab report sheet prior to coming to lab. This is complete question.

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