Bohlen exp. 2

# Bohlen exp. 2 - Experiment 2 Scientific Measurement and...

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Experiment 2 – Scientific Measurement and Error Name Peter Bohlen Lab Day and Time Monday 1pm TA Rus Section 402 Documentation Lab Manual Exp.2.pdf Grading Rubric Possible Points Points Received Materials and Methods 10 Reference lab manual Only describe deviations Results and Discussion 70 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 TOTAL (100) 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 experiment two; Scientific measurement and error. The materials and procedures were listed in the lab manual. 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. Electronic scale Precision Sample Mass (g) Trial 1 Mass (g) Trial 2 Mass (g) Trial 3 Mass (g) Trial 4 Weighing bottle with lid 69.896 69.897 69.896 69.898 Weighing bottle without lid 46.894 46.893 46.894 46.893 Weighing bottle lid only 23.003 23.003 23.003 23.003 Weighing bottle with lid on different balance 69.878 69.883 69.877 69.878 One way to express the accuracy of a measurement is through standard deviation. The standard deviation is a statistic that tells you how tightly the measurements are clustered around the mean in a set
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Bohlen exp. 2 - Experiment 2 Scientific Measurement and...

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