CHEM 105L 2

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Brigham Young University, Idaho *

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105L

Subject

Chemistry

Date

May 3, 2024

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pdf

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Making Measurements Name __________________ Section__________________ Use this worksheet to take notes during your experiment. Fill in the data as indicated as you conduct your trials. Make notes as you go. Show examples of calculations in the “Calculations” sections provided. Accepted density of water Room temperature ( o C) Accepted density from Table 1 Density calculations using different volume instruments a. 150 mL beaker Measurement Trial 1 Trial 2 Trial 3 Mass of empty beaker (g) Volume of water (mL) Mass of beaker and water (g) Mass of water (g) Density of water (g/mL) Average density (g/mL) (your 3 trials) Average group density (g/mL) Group percent error (%) Group standard deviation (g/mL) Calculations b. 50 mL graduated cylinder Measurement Trial 1 Trial 2 Trial 3 Mass of graduated cylinder (g) Volume of water (mL) Mass of grad.cyl. and water (g) Mass of water (g) Density of water (g/mL) Average density (g/mL) (your 3 trials) Average group density (g/mL) 78.74g Miles Shih 78.70g 78.71g 21.1 0.998 52.6 mL 51.92 g 32.71 g 33.1 mL 43.80 g 44.5 mL 0.987 g/mL 0.988 g/mL 0.984 g/mL 0.986 g/mL 70.74 g 70.75 g 70.74 g 130.66 g 111.41 g 122.51 g 119.97 g 50.0 mL 25.0 mL 95.09 g 40.0 mL 110.12 g 49.23 g 24.34 g 39.38 g 0.985 g/mL 0.975 g/mL 0.985 g/mL 0.982 g/mL 0.561 g/mL 44% 0.371 g/mL 0.525 g/mL 08

Group percent error (%) Group standard deviation (g/mL) Calculations c. 50 mL graduated cylinder (small volumes) Measurement Trial 1 Trial 2 Trial 3 Mass of graduated cylinder (g) Volume of water (mL) Mass of grad.cyl. and water (g) Mass of water (g) Density of water (g/mL) Average density (g/mL) (your 3 trials) Average group density (g/mL) Group percent error (%) Group standard deviation (g/mL) Calculations d. 10 mL graduated cylinder Measurement Trial 1 Trial 2 Trial 3 Mass of graduated cylinder (g) Volume of water (mL) Mass of grad.cyl. and water (g) Mass of water (mL) Density of water (g/mL) Average density (g/mL) (your 3 trials) Average group density (g/mL) Group percent error (%) Group standard deviation (g/mL) Calculations 70.74 g 70.74 g 10 mL 7 mL 8 mL 80.48 g 9.74 g 70.76 g 77.76 g 78.68 g 7.00 g 7.94 g 0.974 g/mL 1.000 g/mL 0.993 g/mL 0.989 g/mL 27.18 g 37.00 g 10 mL 10.18 mL 27.21 g 7 mL 34.03 g 6.82 mL 27.18 g 8 mL 34.93 g 7.75 mL 1.018 g/mL 0.974 g/mL 0.969 g/mL 0.987 g/mL 47% 0.400 g/mL 0.531 g/mL 47% 0.418 g/mL 0.494 g/mL 51 % 0.427 g/mL

e. Measuring cup Measurement Trial 1 Mass of measuring cup (g) Volume of water (mL) Mass of measuring cup and water (g) Mass of water (g) Density of water (g/mL) Average group density (g/mL) (3 trials) Group percent error (%) Group standard deviation (g/mL) Calculations f. Tablespoon Measurement Trial 1 Mass of beaker (g) Volume of water (mL) Mass of beaker and water (g) (from tbsp.) Mass of water (g) Density of water (g/mL) Average group density (g/mL) (3 trials) Group percent error (%) Group standard deviation (g/mL) Calculations 115.56 g 50.0 mL 164.88 g 49.32 g 0.986 g/mL 4.75 g 2 mL 6.52 g 1.77 g 0.885 g/mL 0.489 g/mL 51% 0.433 g/mL 0.671 g/mL 33% 0.236 g/mL

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