# Chem 01.07 Accuracy & Precision

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• Published : September 23, 2012

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01.07 Accuracy and Precision: Balance Lab Worksheet
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 assigment.) * 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)| 25.50| 25.50| 25.50| Volume of liquid (milliliters)| 8.10| 8.30| 8.10|
Mass of graduated cylinder and liquid (grams)| 35.50| 36.00| 35.50| Part II: Density of Irregular-Shaped Solid|
Mass of solid (grams)| 38.285| 42.345| 42.577|
Volume of water (milliliters)| 51.00| 50.95| 52.90|
Volume of water and solid (milliliters)| 55.50| 55.90| 56.95| Part III: Density of Regular-Shaped Solid|
Mass of solid (grams)| 27.00| 26.50| 25.50|
Length of solid (centimeters)| 5.25| 5.00| 4.50|
Width of solid (centimeters)| 3.00| 4.00| 3.50|
Height of solid (centimeters)| 2.50| 3.00| 2.00|

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.) * Trial1: 35.50 – 25.50 = 10.00 Grams

* Trial2: 36.00 – 25.50 = 10.50 Grams
* Trial3: 35.50 – 25.50 = 10.00 Grams
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.) * Trial1: 10.00 / 8.10 = 1.23 Grams / Milliliters

* Trial2: 10.50 / 8.30 = 1.27 Grams / Milliliters
* Trial3: 10.00 / 8.10...