Measurement Prelab

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School

Community College of Baltimore County *

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Course

108

Subject

Chemistry

Date

Feb 20, 2024

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pdf

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Uploaded by ChiefPonyMaster52

Pre-Lab Exercises Show all of your work. 1. What i s the length in cm of the rod shown below ? 2. If Student A measures the volume of a liquid and reports i ts volume as 23.50 mL and Student B measures a d ifferent amo un t of the same liquid and reports i ts volume as 15.0 mL , is it likel y that the students used the same measuring device ? Yes or no ? Explain your answer. 3. A group of five students attempted to estimate 100 g of a substance and obtained the following masses after each estimated amount was we i ghed: 95.8634 g , 80.8 125 g , 106.5078 g , 98 . 2865 g , and 86.4453 g. U se the data to determine the answers to the follow i ng questions: a) What is the mean ? And what i s the true value ? b) What are the average dev i at i on and % dev i at i on from the mean ? c) What are the error and % error ? 4. A student uses a stoppered 25.0-mL volumetric flask to determine the density of a liquid. The mass of the empty flask and stopper was 25.1841 g. The mass of the stoppered flask filled with liquid up to the scratch mark was 45.0379 g. Calculate the density of the liquid in appropriate units and with the correct number of significant figures. 5. Calculate the error and percent error of a sample of water using the following data: the actual density of water at 23 ℃ is 0.999765 g /mL and the experimental density (at 23 ℃) is 1.097 g /mL. Show your work and watch your significant figures.

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