# accuracy and precision

## accuracy and precision

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Procedure
Access the virtual lab and complete the experiments.
Data
Below is the table that you will complete for the virtual lab. Either type your results into this table or print the table from the virtual lab (it must be submitted to receive full credit for this assignment.)
To print from the virtual lab.
1. Be sure the data table is viewable.
2. Right-click (PC) or Command-Click (Mac) on the table and select print.
Part I: Density of Unknown Liquid

Trial 1
Trial 2
Trial 3
Mass of Empty 10 mL graduated cylinder (grams)
26
26
26.1
Volume of liquid (milliliters)
8.79
8.49
8.41
Mass of graduated cylinder and liquid (grams)
37
36.5
36.3
Part II: Density of Irregular-Shaped Solid
Mass of solid
(grams)
39.35
42.481
40.925
Volume of water (milliliters)
51.1
48.9
49.9
Volume of water and solid (milliliters)
55.9
53.9
54.5
Part III: Density of Regular-Shaped Solid
Mass of solid (grams)
27.5
27.6
27.8
Length of solid (centimeters)
5.25
5
4.5
Width of solid (centimeters)
3
4
3.5
Height of solid (centimeters)
2.5
3
2
Calculations
Show all of your work for each of the following calculations and be careful to follow significant figure rules in each calculation.
Part I: Density of Unknown Liquid
1. Calculate the mass of the liquid for each trial. (Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder with liquid.)
Trial 1
37 – 26 = 11g
Trial 2
36.5 – 26 = 10.5g
Trial 3
36.3 – 26.1 = 10.2g
2. Calculate the density of the unknown liquid for each trial. (Divide the mass of the liquid calculated above by the volume of the liquid.)
Trial 1:
11 / 8.79 = 1.251422071 = 1.25
Trial 2:
10.5 / 8.49 = 1.236749117 = 1.24
Trial 3:
10.2 / 8.41 = 1.212841855 = 1.21
Part II: Density of Irregular-Shaped Solid
3. Calculate the volume of the irregular-shaped solid for each trial. (Subtract the volume of the water from the total volume of the water and solid.)...