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standard deviation, and relative standard deviation.

standard deviation, and relative standard deviation.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1. 2. The accuracy of a measurement may be expressed as the per cent error. Each set of analytical results should be accompanied by an indication of the precision of the analysis. Precision may be indicated by average deviation, standard deviation, and relative standard deviation. A student obtained experimentally the following values for the atomic weight of bromine: 79.914. 79.894, 79.910, 79.920, 79.918, 79.922, and 79.908 amu. Arrange the data in tabular formas in the lab manual on p. 1(D) - 4. a. Determine the: median value, mean value, average deviation, standard deviation, relative standard deviation, and the per cent error of the mean value. b. Use the Q test to determine whether the 79.894 value should be retained or rejected. The following lab report requires many calculations, and it is essential that you can report results with the correct number of significant digits. Attempt the following calculations and report your answers in scientific notation with the correct number of significant figures. Assume that all numberswere obtained from measurements. a. 675 - 2.34 = %D b. (7.695 - 7.673) / (7.673) = c. (4.51 x 10-1) + (7.0 x 10-3) %D d. (5.4 x 105) - (2.785) e. Log (4.87 × 10) = f. antilog (-1.7433) = %3D %3D A student wish to calculate the volume of one mole of gas at -40 C at 253 Torr (summit of Everest). H does the following calculation. 3. R = 0.08206 L atm K mol and 760 Torr = 1 atm %3D V = nRT/P = 1 x 0.08206 x -40/253 but something is not right. Do the calculation for the student. Show the details. How could he/she have avoided the confusion in the first place?
Transcribed Image Text:1. 2. The accuracy of a measurement may be expressed as the per cent error. Each set of analytical results should be accompanied by an indication of the precision of the analysis. Precision may be indicated by average deviation, standard deviation, and relative standard deviation. A student obtained experimentally the following values for the atomic weight of bromine: 79.914. 79.894, 79.910, 79.920, 79.918, 79.922, and 79.908 amu. Arrange the data in tabular formas in the lab manual on p. 1(D) - 4. a. Determine the: median value, mean value, average deviation, standard deviation, relative standard deviation, and the per cent error of the mean value. b. Use the Q test to determine whether the 79.894 value should be retained or rejected. The following lab report requires many calculations, and it is essential that you can report results with the correct number of significant digits. Attempt the following calculations and report your answers in scientific notation with the correct number of significant figures. Assume that all numberswere obtained from measurements. a. 675 - 2.34 = %D b. (7.695 - 7.673) / (7.673) = c. (4.51 x 10-1) + (7.0 x 10-3) %D d. (5.4 x 105) - (2.785) e. Log (4.87 × 10) = f. antilog (-1.7433) = %3D %3D A student wish to calculate the volume of one mole of gas at -40 C at 253 Torr (summit of Everest). H does the following calculation. 3. R = 0.08206 L atm K mol and 760 Torr = 1 atm %3D V = nRT/P = 1 x 0.08206 x -40/253 but something is not right. Do the calculation for the student. Show the details. How could he/she have avoided the confusion in the first place?
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