1. If you were given a 2.0 cm³ piece of aluminum and a 2.0 cm³ piece of lead, which would yo predict to have the larger mass? Explain your choice fully. 2. Analyze the class results below for the density measurements of copper. What is the avere density for copper? Calculate the RAD and the percent relative error. Comment on th accuracy and precision. Grams Volume (mL) 169.417 19.1 169.155 18.9 183.065 20.5 174.244 19.6 Procedure: Investigation of the precision and accuracy of different glassware The precision and accuracy of a measurement depends on the measuring device. In la be measuring volume of a liquid using either a beaker, graduated cylinder, a pipet, or a For the equipment you will be using the precision of the glassware is given below: VOLUME (mL) GLASSWARE Beaker Graduated cylinder Volumetric Pipet Buret 10. 10.00 10.00 10.00 PRECISION ±5% ± 0.05 mL ±0.02 mL ±0.05 mL Significant Figures? To test the accuracy and precision of different equipment, do the following: each use every piece of glassware (beaker, graduated cylinder, volumetric pipet, an student will measure one three 10 mL sample with each piece of glassware. The total measurements. Measure the volume of three individual 10 mL samples of d weigh each on the balance. Be sure to record your masses carefully as each 33

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter19: Nuclear Chemistry

Section: Chapter Questions

Problem 47AP

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1. If you were given a 2.0 cm³ piece of aluminum and a 2.0 cm³ piece of lead, which would yo predict to have the larger mass? Explain your choice fully. 2. Analyze the class results below for the density measurements of copper. What is the avere density for copper? Calculate the RAD and the percent relative error. Comment on th accuracy and precision. Grams Volume (mL) 169.417 19.1 169.155 18.9 183.065 20.5 174.244 19.6 Procedure: Investigation of the precision and accuracy of different glassware The precision and accuracy of a measurement depends on the measuring device. In la be measuring volume of a liquid using either a beaker, graduated cylinder, a pipet, or a For the equipment you will be using the precision of the glassware is given below: VOLUME (mL) GLASSWARE Beaker Graduated cylinder Volumetric Pipet Buret 10. 10.00 10.00 10.00 PRECISION ±5% ± 0.05 mL ±0.02 mL ±0.05 mL Significant Figures? To test the accuracy and precision of different equipment, do the following: each use every piece of glassware (beaker, graduated cylinder, volumetric pipet, an student will measure one three 10 mL sample with each piece of glassware. The total measurements. Measure the volume of three individual 10 mL samples of d weigh each on the balance. Be sure to record your masses carefully as each 33

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