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Mitchell Graded Exp 2

Mitchell Graded Exp 2 - Experiment 2 Scientific Measurement...

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Experiment 2 – Scientific Measurement and Error Spring 2008 Name Lab Day and Time TA Section Documentation Grading Rubric Possible Points Points Received Materials and Methods 10 10 Reference lab manual Only describe deviations Results and Discussion 70 53 Insert titles for tables Showed complete sample calculations Summarized all data in tables Answered questions correctly Uses experimental data to clearly expresses differences between accuracy and precision Error analysis Laboratory Technique 20 20 TOTAL (100) 83 TA Comments/Suggestions:
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C HEMISTRY 11L R EPORT T EMPLATE EXPT. Scientific Measurements and Error 2 Introduction The purpose of this report is to determine the accuracy and precision of common scientific equipment. The purpose of the experiment is to learn how scientific measurements are carried out properly using an electronic balance and various pieces of volumetric glassware, and to acquire an appreciation of the significance of measurements. Materials and Methods The procedure for this experiment was taken from the University of North Carolina at Chapel Hill Chemistry 101 Lab Manual. There were no deviations from the procedure. Results and Discussion The goal of the first part of the experiment is to determine the precision of the electronic balances in the lab. The data used for analysis are summarized in Table 1. Table 1. Balance Accuracy and Precision: Mass Mass (g) of weighing bottle with and without lid -2 Sample Mass (g) Trial 1 Mass (g) Trial 2 Mass (g) Trial 3 Mass (g) Trial 4 Weighing bottle with lid 74.081 g 74.081 g 74.081 g 74.081 g Weighing bottle without lid 50.306 g 50.306 g 50.306 g 50.306 g Weighing bottle lid only 23.775 g 23.775 g 23.775 g 23.775 g Weighing bottle with lid on different balance 74.081 g 74.081 g 74.081 g 74.081 g One way to express the precision of a measurement is through standard deviation.
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