Accuracy and Precision Lab (with measurement and density)

In this lab exercise, students are introduced to various measurement tools (ruler, graduated cylinder, triple beam balance) and taught how to use them and correctly record data (correct number of significant figures). Students calculate density, and are introduced to its dependence on temperature. Calculations of accuracy (percent error) and precision (average deviation) are also emphasized, as is the correct use of significant figures.

This lab will take 30-60 minutes of class time for data collection, depending on the skills of the students. Prior to this lab, students should be introduced to measurements, significant figures, percent error, and average deviation. It works well near the beginning of a course.

Materials required: Ruler calibrated in millimeters, 100 mL graduated cylinder, thermometer, centigram balance, metal shot (~50 g of one metal for each group, vary metals: I used copper, zinc, and nickel), room temperature water
Other notes: see Teacher narrative for accuracy and precision lab (Microsoft Word 27kB Sep21 09)
Student handout for accuracy and precision lab (Microsoft Word 43kB Sep21 09)

See Teacher narrative for accuracy and precision lab (Microsoft Word 27kB Sep21 09)

Teacher should check data to be sure it is recorded with the right number of significant figures and units. Teacher should check answers to the questions at the end of the lab.

9.1.3.4.4 reliability of data
9C.1.3.4.1 significant figures, accuracy, and precision
9P.1.3.4.1 significant figures, accuracy, and precision