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17 cze 2023 · If you look at a 10 mL graduated cylinder, for example, the smallest graduation is tenth of a milliliter (0.1 mL). That means when you read the volume, you can estimate to the hundredths place (0.01 mL). You must use the bottom of the meniscus to determine the volume in the 10 mL graduated cylinder.
Use the 10 mL graduated cylinder, which will be accurate to two significant figures. Mathematical operations are carried out using all the digits given and then rounding the final result to the correct number of significant figures to obtain a reasonable answer.
CHEMISTRY 11 – EXPERIMENTAL UNCERTAINTY OF APPARATUS WORKSHEET. (1) Record the values for the experimental uncertainty encountered in using the following apparatus: Apparatus. Difference between numbered divisions. # of unnumbered subdivisions between numbered divisions. Smallest unnumbered divisions.
The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
UNCERTAINTY IN MEASUREMENTS. PURPOSE: This lab study packet deals with various errors in experiments, avoidable (systematic) and unavoidable (random), and how they affect your experimental results. In many of the Chem 111 experiments you will be asked to give some indication to the validity of your results you report.
12 cze 2008 · Uncertainties for Volumetric Glassware. Volumetric glassware, such as pipettes, burettes, and flasks, is required when performing any analytical determinations. This page provides a table of typical uncertainty values for the calibrated volume of such glassware.
An irregularly shaped piece of a shiny yellowish material is weighed and then submerged in a graduated cylinder, with results as shown. (a) Use these values to determine the density of this material. (b) Do you have any reasonable guesses as to the identity of this material? Explain your reasoning.
