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REPORT SUMMARY Dimensions and masses of solid objects Identification number of assigned objects 201 Dimensions and masses of cylinders Diameter (cm) Height (cm) Mass (g) 1.16 1.67 3.573 a 1.17 2.44 5.277 b 1.11 1.62 3.145 d 1.12 1.56 3.086 Pipet delivery measurements a 23.2 Enter the temperature of the water to the nearest tenth degree (0.1 C). Mass measurements of water Mass (g) 3.973 Trial 1 3.981 Trial 2 3.966 Trial 3 3.980 Trial 4 3.959 Trial 5 (39pts) Dimensions and Masses of Solid Objects Table view List view Density of object analysis E O el REPORT SUMMARY Table view List view Density of object analysis Diameter (cm) Height (cm) Mass (9) Volume (cm) Density (g/cm) Object A 1.16 1.67 3.573 Object B 1.17 2.44 5.277 Object 1.11 1.62 3.145 Object D 1.12 1.56 3.086 Table view List view Density statistics Density (g/cm) Average Standard deviation Coefficient of variation (CV) True density 2.010 Absolute error % error il E REPORI SUMMAR Optional: Upload your spreadsheet for dimension-mass-density data analysis. UPLOAD THE xlsx FILE. Maximum size for new files 20.00MB Maximum attachments 4 Drag and drop a file or folder here or click (32pts) Pipet Delivery Measurements: (2pts) Use the table of water density at different temperatures to find the denisty of water at 23.20 C. Include all seven decimal places provided in the table. Table view List view Volume delivery analysis Mass delivered (9) Volume delivered (ml) 3.973 Trial 1 3.981 Trial 2 3.966 Trial 3 3.980 Trial 4 earch O REPORT SUMMARY Mass delivered (9) Volume delivered (mL) Trial 1 3.973 Trial 2 3.981 Trial 3 3.966 Trial 4 3.980 Trial 5 3.959 Table view List view Volume delivery statistics Volume (mL) Average Standard deviation Coefficient of variation (CV) True volume 4.000 Absolute error % error lontal O E ch jo CE REPORT SUMMARY Mass delivered (9) Volume delivered (mL) Trial 1 3.973 Trial 2 3.981 Trial 3 3.966 Trial 4 3.980 Trial 5 3.959 Table view List view Volume delivery statistics Volume (mL) Average Standard deviation Coefficient of variation (CV) True volume 4.000 Absolute error % error lontal O E ch jo CE (12pts) Analysis: Density of weighed objects In the table above, you calculated the densities of a series of object, all made of the same material, and calculated the average value, standard deviation, etc. Based on the calculations, answer the following questions. (1 pts) a. Is the coefficient of variation (CV) for the measured density 1.0%, measure of accuracy D. CV > 1.0%, measure of precision (1pts) b. Is the percent error for the measured density 1.0%, measure of accuracy D. % error > 1.0%, measure of precision (1 pts) c. Which of these (CV or % error) is most closely associated with each of the following: Choose... 1. Scatter (1 pts) ii. Systemic error Choose... (1pts) iii. Random error Choose... ch O BI REPORT SUMMARY (1 pts) fii. Random error Choose... (1 pts) iv. Bias Choose... d. In many methods that employ multiple measurements, one particular type of measurement may be the "weak link" that limits overall precision. For the density measurements you made here, you will determine what contributes most to the CV of your calculated density - the measurements of mass or of dimensions. Typical standard deviation for length and mass using the equipment employed in this lab are the following: Dimensions: 0.01 cm Mass: 0.002 g Select the data for your lightest object, focusing on its mass and its shortest dimension, and answer the following two questions: (2pts) i. What is the CV for the mass value? (2pts) ii. What is the CV for the measurement of its shortest dimension? (2pts) e. Which type of measurements (mass or dimensions) had the greatest impact on the CV of the measured density? Choose the explanation 1. Mass measurements have the greater impact because the mass CV with lightest object was greater than its dimension CV. 2. Mass measurements have the greater impact because the mass CV with lightest object was lesser than its dimension CV. 3. Dimension measurements have the greater impact because the dimension CV with lightest object was greater than its mass CV. manto bawatha arterianast ban the dimension with O Choose... Dimad E (2pts) e. Which type of measurements (mass or dimensions) had the greatest impact on the CV of the measured density? Choose the explanation Choose... 1. Mass measurements have the greater impact because the mass CV with lightest object was greater than its dimension CV. 2. Mass measurements have the greater impact because the mass CV with lightest object was lesser than its dimension CV. 3. Dimension measurements have the greater impact because the dimension CV with lightest object was greater than its mass CV. 4. Dimension measurements have the greater impact because the dimension CV with lightest object was lesser than its mass CV. (15pts) Analysis: Solution delivery method In this lab, you determined the volume of water delivered using a mechanical pipet set to deliver 4.00 mL. You could have carried out the same procedure delivering 4-ml portions of water using a small graduated cylinder. A typical result for such a measurement is the following (result of five replicate measurements): Graduated cylinder Average: 3.92 mL St. Dev: 0.11 mL (2pts) a. Calculate the percent error for the graduated cylinder method described above, assuming the intended volume was 4.00 mL. (2pts) b. Calculate the CV for the graduated cylinder method described above, assuming the intended volume was 4.00 mL. (2pts) c. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. 0 REPORT SUMMARY (2pts) c. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. Which method of delivery (graduated cylinder or pipet) is more accurate? Cite your evidence (what specific information tells you this). Choose... 1. The graduated cylinder is more accurate because its CV is less than the pipet. 2. The graduated cylinder is more accurate because its % error is less than the pipet. 3. The pipet is more accurate because its CV is less than the graduated cylinder. 4. The pipet is more accurate because its % error is less than the graduated cylinder. (2pts) d. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. Choose... Which method of delivery (graduated cylinder or pipet) is more precise? Cite your evidence, 1. The graduated cylinder is more precise because its CV is less than the pipet. 2. The graduated cylinder is more precise because its % error is less than the pipet. 3. The pipet is more precise because its CV is less than the graduated cylinder. 4. The pipet is more precise because its % error is less than the graduated cylinder. e. Both deliveries were intended to deliver "4 mL". For both the pipet and graduated cylinder, determine how many significant figures should be used to express the value appropriately, should the volume be expressed as "4 mL", "4.0 ml", "4.00 mL", "4.000 mL", "4.0000 mL", etc.? Key: Which digit is the first uncertain digit? (1.5pts) i. Select the number of significant figures for the graduated cylinder. Choose... (1.5pts) ii. Select the number of significant figures for the pipet. Choose... (4pts) REPORT SUMMARY 4. me piperis more precise because its 75 error IS Tess than the graduated cylinder e. Both deliveries were intended to deliver 4 mL". For both the pipet and graduated cylinder, determine how many significant figures should be used to express the value appropriately, should the volume be expressed as "4 mL","4.0 mL", "4.00 mL", 14.000 mL", "4.0000 mL", etc.? Key: Which digit is the first uncertain digit? (1.5pts) i. Select the number of significant figures for the graduated cylinder. Choose... (1.5pts) ii. Select the number of significant figures for the pipet. Choose... (4pts) f. Manufacturers of the type of mechanical pipets typically claim accuracy of +0.02 mL (maximum absolute error) and precision of +0.02 ml (based on standard deviation). (Note: specific claims depend on the volume of the delivery.) Are the results from mechanical pipet measurements (not the graduated cylinder measurements) consistent with these claims? Select the answer that best cites your data and/or calculations as evidence. Choose... A. My results agree - my absolute error and standard deviation were less than the claimed values B. My results somewhat agree - my absolute error was less than the claimed value, but my standard deviation was greater than the claimed precision C. My results somewhat agree - my standard deviation was less than the claimed value, but my absolute error was greater than the claimed accuracy. D. My results don't agree at all - both my absolute error and standard deviation were greater than the claimed values. Total: -/100 pts SUBMIT O E HD E REPORT SUMMARY Dimensions and masses of solid objects Identification number of assigned objects 201 Dimensions and masses of cylinders Diameter (cm) Height (cm) Mass (g) 1.16 1.67 3.573 a 1.17 2.44 5.277 b 1.11 1.62 3.145 d 1.12 1.56 3.086 Pipet delivery measurements a 23.2 Enter the temperature of the water to the nearest tenth degree (0.1 C). Mass measurements of water Mass (g) 3.973 Trial 1 3.981 Trial 2 3.966 Trial 3 3.980 Trial 4 3.959 Trial 5 (39pts) Dimensions and Masses of Solid Objects Table view List view Density of object analysis E O el REPORT SUMMARY Table view List view Density of object analysis Diameter (cm) Height (cm) Mass (9) Volume (cm) Density (g/cm) Object A 1.16 1.67 3.573 Object B 1.17 2.44 5.277 Object 1.11 1.62 3.145 Object D 1.12 1.56 3.086 Table view List view Density statistics Density (g/cm) Average Standard deviation Coefficient of variation (CV) True density 2.010 Absolute error % error il E REPORI SUMMAR Optional: Upload your spreadsheet for dimension-mass-density data analysis. UPLOAD THE xlsx FILE. Maximum size for new files 20.00MB Maximum attachments 4 Drag and drop a file or folder here or click (32pts) Pipet Delivery Measurements: (2pts) Use the table of water density at different temperatures to find the denisty of water at 23.20 C. Include all seven decimal places provided in the table. Table view List view Volume delivery analysis Mass delivered (9) Volume delivered (ml) 3.973 Trial 1 3.981 Trial 2 3.966 Trial 3 3.980 Trial 4 earch O REPORT SUMMARY Mass delivered (9) Volume delivered (mL) Trial 1 3.973 Trial 2 3.981 Trial 3 3.966 Trial 4 3.980 Trial 5 3.959 Table view List view Volume delivery statistics Volume (mL) Average Standard deviation Coefficient of variation (CV) True volume 4.000 Absolute error % error lontal O E ch jo CE REPORT SUMMARY Mass delivered (9) Volume delivered (mL) Trial 1 3.973 Trial 2 3.981 Trial 3 3.966 Trial 4 3.980 Trial 5 3.959 Table view List view Volume delivery statistics Volume (mL) Average Standard deviation Coefficient of variation (CV) True volume 4.000 Absolute error % error lontal O E ch jo CE (12pts) Analysis: Density of weighed objects In the table above, you calculated the densities of a series of object, all made of the same material, and calculated the average value, standard deviation, etc. Based on the calculations, answer the following questions. (1 pts) a. Is the coefficient of variation (CV) for the measured density 1.0%, measure of accuracy D. CV > 1.0%, measure of precision (1pts) b. Is the percent error for the measured density 1.0%, measure of accuracy D. % error > 1.0%, measure of precision (1 pts) c. Which of these (CV or % error) is most closely associated with each of the following: Choose... 1. Scatter (1 pts) ii. Systemic error Choose... (1pts) iii. Random error Choose... ch O BI REPORT SUMMARY (1 pts) fii. Random error Choose... (1 pts) iv. Bias Choose... d. In many methods that employ multiple measurements, one particular type of measurement may be the "weak link" that limits overall precision. For the density measurements you made here, you will determine what contributes most to the CV of your calculated density - the measurements of mass or of dimensions. Typical standard deviation for length and mass using the equipment employed in this lab are the following: Dimensions: 0.01 cm Mass: 0.002 g Select the data for your lightest object, focusing on its mass and its shortest dimension, and answer the following two questions: (2pts) i. What is the CV for the mass value? (2pts) ii. What is the CV for the measurement of its shortest dimension? (2pts) e. Which type of measurements (mass or dimensions) had the greatest impact on the CV of the measured density? Choose the explanation 1. Mass measurements have the greater impact because the mass CV with lightest object was greater than its dimension CV. 2. Mass measurements have the greater impact because the mass CV with lightest object was lesser than its dimension CV. 3. Dimension measurements have the greater impact because the dimension CV with lightest object was greater than its mass CV. manto bawatha arterianast ban the dimension with O Choose... Dimad E (2pts) e. Which type of measurements (mass or dimensions) had the greatest impact on the CV of the measured density? Choose the explanation Choose... 1. Mass measurements have the greater impact because the mass CV with lightest object was greater than its dimension CV. 2. Mass measurements have the greater impact because the mass CV with lightest object was lesser than its dimension CV. 3. Dimension measurements have the greater impact because the dimension CV with lightest object was greater than its mass CV. 4. Dimension measurements have the greater impact because the dimension CV with lightest object was lesser than its mass CV. (15pts) Analysis: Solution delivery method In this lab, you determined the volume of water delivered using a mechanical pipet set to deliver 4.00 mL. You could have carried out the same procedure delivering 4-ml portions of water using a small graduated cylinder. A typical result for such a measurement is the following (result of five replicate measurements): Graduated cylinder Average: 3.92 mL St. Dev: 0.11 mL (2pts) a. Calculate the percent error for the graduated cylinder method described above, assuming the intended volume was 4.00 mL. (2pts) b. Calculate the CV for the graduated cylinder method described above, assuming the intended volume was 4.00 mL. (2pts) c. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. 0 REPORT SUMMARY (2pts) c. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. Which method of delivery (graduated cylinder or pipet) is more accurate? Cite your evidence (what specific information tells you this). Choose... 1. The graduated cylinder is more accurate because its CV is less than the pipet. 2. The graduated cylinder is more accurate because its % error is less than the pipet. 3. The pipet is more accurate because its CV is less than the graduated cylinder. 4. The pipet is more accurate because its % error is less than the graduated cylinder. (2pts) d. Compare the results for the graduated cylinder (from above) and your result using a mechanical pipet. Choose... Which method of delivery (graduated cylinder or pipet) is more precise? Cite your evidence, 1. The graduated cylinder is more precise because its CV is less than the pipet. 2. The graduated cylinder is more precise because its % error is less than the pipet. 3. The pipet is more precise because its CV is less than the graduated cylinder. 4. The pipet is more precise because its % error is less than the graduated cylinder. e. Both deliveries were intended to deliver "4 mL". For both the pipet and graduated cylinder, determine how many significant figures should be used to express the value appropriately, should the volume be expressed as "4 mL", "4.0 ml", "4.00 mL", "4.000 mL", "4.0000 mL", etc.? Key: Which digit is the first uncertain digit? (1.5pts) i. Select the number of significant figures for the graduated cylinder. Choose... (1.5pts) ii. Select the number of significant figures for the pipet. Choose... (4pts) REPORT SUMMARY 4. me piperis more precise because its 75 error IS Tess than the graduated cylinder e. Both deliveries were intended to deliver 4 mL". For both the pipet and graduated cylinder, determine how many significant figures should be used to express the value appropriately, should the volume be expressed as "4 mL","4.0 mL", "4.00 mL", 14.000 mL", "4.0000 mL", etc.? Key: Which digit is the first uncertain digit? (1.5pts) i. Select the number of significant figures for the graduated cylinder. Choose... (1.5pts) ii. Select the number of significant figures for the pipet. Choose... (4pts) f. Manufacturers of the type of mechanical pipets typically claim accuracy of +0.02 mL (maximum absolute error) and precision of +0.02 ml (based on standard deviation). (Note: specific claims depend on the volume of the delivery.) Are the results from mechanical pipet measurements (not the graduated cylinder measurements) consistent with these claims? Select the answer that best cites your data and/or calculations as evidence. Choose... A. My results agree - my absolute error and standard deviation were less than the claimed values B. My results somewhat agree - my absolute error was less than the claimed value, but my standard deviation was greater than the claimed precision C. My results somewhat agree - my standard deviation was less than the claimed value, but my absolute error was greater than the claimed accuracy. D. My results don't agree at all - both my absolute error and standard deviation were greater than the claimed values. Total: -/100 pts SUBMIT O E HD E
