Rusch-Lab2.docx

# Rusch-Lab2.docx - CHM130LL Lab 2 Measurements Accuracy and...

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CHM130LL Lab 2 Measurements: Accuracy and Precision A. Data Tables (36 points) Place your completed data tables into your report here: Data Table 1 Measurement Data Length of aluminum plastic packet 5.05 cm Height of aluminum plastic packet 6.61 cm Temperature of faucet water 27.9 °C Temperature of ice water 13.8 °C Volume of water in 10-mL graduated cylinder 9.38 mL Volume of water in 50-mL graduated cylinder 11.9 mL Data Table 2 Measurement Data

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Inside diameter of 50-mL graduated cylinder 8.14 cm Height of 50-mL graduated cylinder 2.75 cm Water temperature 20.5 °C Initial volume of water in 50-mL graduated cylinder 10.0 mL Mass of water in the 50-mL graduated cylinder 10.0 g Volume of water and aluminum shot in 50- mL graduated cylinder 17.7 mL Mass of aluminum shot (given on outside of packet) 19.93 g B. Follow-Up Questions (Show all calculations) Part I (Each question is worth 10 points.) 1. Convert the length and height measurements for the packet that contains the aluminum shot from units of cm to units of mm using the unit-factor method. a. To convert a length of 5.05 cm to mm, I would use the 10 mm/1 cm rule and multiply it by 5.05 cm (to clear the cm) and the result would be 50.50 mm or 50.mm (2 sig figs) b. To convert the height of 6.61 cm, I would use the same rule, 6.61 (10) = 66.10 mm or 66.mm (2 sig figs) 2. Convert the temperature measurements for the faucet water and the ice water from o C to o F, using the following equation: o F = 1.8( o C) + 32 . a. Faucet water was 27.9 °C -- 1.8(27.9) = 50.2, 50.2 + 32 = 82.2 °F or 82.°F (2 sig figs) b. Ice water was 13.8 °C -- 1.8(13.8) = 24.8, 24.8+32 = 56.8 °F or 57.°F (2 sig figs)
3. Convert the volumes of the water in the 10-mL and 50-mL graduated cylinders from mL to L, using the unit-factor method. a. In the 10-mL cylinder I had 9.38 mL, to convert to L I would use the 1000 mL/1 L factor. 9.38 x 1/1000 (to clear the mL) would result in .009 L. b. In the 50-mL I had 11.9 mL, using the same factor, 11.9 x 1/1000 equals .012 L 4. Looking at your measurements for the volumes of water in the 10-mL and 50-mL graduated cylinders, are your values identical? Discuss at least two reasons why the measurements were not identical.

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