chem 101 lab 1

chem 101 lab 1 - Experiment 2 Scientific Measurement and...

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Experiment 2 – Scientific Measurement and Error Fall 2007 Name Emily Winslett Lab Day and Time Tuesday, 1:00 TA Duy Le Section 409 Documentation Lab Manual, Pre-Lab Lecture 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 the Chemistry 101L Lab Manual. The experimental procedure was followed directly out of the Chemistry 101L Lab Manual for Experiment 2. The mass of a weighing bottle and lid was first measured on an electric balance. Four trials were taken to find the mass in grams on one scale. Four trials were taken to measure precision. Next, the weighing bottle without the lid was weighed for four trials on the same electric balance. Then only the lid of the weighing bottle was measured for four trials. Lastly, the weighing bottle and lid were placed on another electric balance to measure the mass for four trials. This was for accuracy of measurements. The masses of each piece of equipment for each trial were recorded in Data table 1, and then the mean and standard deviation were taken. Next, different pieces of volumetric glassware were examined to figure out whether they were “TD” or “TC”, what their calibration temperature was, and also the volume graduation. Then 10 mL of water was measured using the 10-mL graduated cylinder, and once measured correctly the water was poured into the 100-mL graduated cylinder. This process was repeated ten times, and then the volume of the water in the 100-mL graduated cylinder was taken. This measurement is recorded in data table 3, and then the results from three other students were also recorded. Then the mean and standard deviation were calculated. Then, by using a 5-mL graduated pipet, 3 mL of water are measured and then delivered into a 10-mL graduated cylinder. The volume of the This processes was repeated four times for precision, and then the standard deviation and mean were calculated. Then the same process was taken with a 50-mL buret. Three mL of water was delivered from the buret into the 10 mL graduated cylinder and the volume of the
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This note was uploaded on 05/01/2008 for the course CHEM 101L taught by Professor Austell during the Spring '08 term at UNC.

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chem 101 lab 1 - Experiment 2 Scientific Measurement and...

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