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chp.1 Intro to measurement
Course: CHEM 103a, Spring 2008School: Arizona
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104A Lab Chem Report Chapter 6 "Introduction to Measurements" Chem 104A Section 045 1/30/07 By: Parker Ashbaugh Chem 104A Raw Observations and Date: - This can be found on the sheet stapled to the lab report. Calculations Average Mass= sum of all masses/ total # of masses Ex. Average = 84.2552 + 83.2449 + 83.2540 + 83.2448 + 83.2446 = 83.4487g 5 Standard Deviation = [( I (measured massI -...
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104A
Lab Chem Report
Chapter 6 "Introduction to Measurements"
Chem 104A Section 045 1/30/07
By: Parker Ashbaugh
Chem 104A Raw Observations and Date: - This can be found on the sheet stapled to the lab report. Calculations Average Mass= sum of all masses/ total # of masses Ex. Average = 84.2552 + 83.2449 + 83.2540 + 83.2448 + 83.2446 = 83.4487g 5 Standard Deviation = [( I (measured massI - avg. mass)^2 / (number of values- 1)] Ex. Deviation = { [(84.2452-83.4487)^2 + (83.2449-83.4487)^2 + (83.254083.4487)^2 + (83.2448-83.4487)^2 + (83.2446-83.4487)^2] / (5-1)} St. Deviation= 83.4487g +/- .22g Relative Standard Deviation= standard deviation = 3.7977= average value 89.7242 Results Exercise 1-A This table shows the results from massing the same beaker on the same scale. Trials Mass of Beaker(g) 84.2452 83.2449 83.2540 83.2448 83.2446 Average mass of beaker(g) 83.4487 83.4487 83.4487 83.4487 83.4487 Standard Deviation 83.4487g +/- .22g 83.4487g +/- .22g 83.4487g +/- .22g 83.4487g +/- .22g 83.4487g +/- .22g .0423
1 2 3 4 5
Exercise 1-B: This table shows the results from massing the same beaker on five different scales. Scale Mass(g) Average Mass(g) Standard Deviation
Chem 104A 1 2 3 4 5 83.2446 83.2448 83.2461 83.2440 83.2435 83.4487 83.4487 83.4487 83.4487 83.4487 83.4487g +/- .11g 83.4487g +/- .11g 83.4487g +/- .11g 83.4487g +/- .11g 83.4487g +/- .11g
Exercise 1-C: This table shows the results from massing five different beakers on the same scale. Beaker # Mass of beaker(g) 93.0500 83.2438 95.6975 96.6196 80.0101 Average mass(g) 89.7242 89.7242 89.7242 89.7242 Standard 89.7242 Deviation 89.7242 +/3.7977 89.7242 +/3.7977 89.7242 +/3.7977 89.7242 +/3.7977 89.7242 +/3.7977 Relative Standard Deviation .0423 +/3.7977 .0423 +/3.7977 .0423 +/3.7977 .0423 +/3.7977 .0423 +/3.7977
1 2 3 4 5
Exercise 2-A: This table shows the results collected from massing 10mL of water, using a graduated cylinder, in a 100mL beaker. Trial Mass of beaker(g) 83.2438 Mass of Water(g) 8.9876 Avg. Mass(g) 9.3611 Standard Deviation 9.3611 +/.2780 Relative Standard Deviation .0297 +/.2780
1
Chem 104A 2 3 4 5 83.2438 83.2438 83.2438 83.2438 9.9694 8.9079 9.9694 8.9712 9.3611 9.3611 9.3611 9.3611 9.3611 +/.2780 9.3611 +/.2780 9.3611 +/.2780 9.3611 +/.2780 .0297 +/.2780 .0297 +/.2780 .0297 +/.2780 .0297 +/.2780
Exercise 2-B: This table shows the results from using a pipette to add increments of 10mL to a beaker.
Trial
Mass of beaker(g) 47.1360 47.1360 47.1360 47.1360 47.1360
Mass of Water(g) 9.4836 9.9455 9.9437 9.9455 9.9411
Avg. Mass(g) 9.8519 9.8519 9.8519 9.8519 9.8519
Standard Deviation 9.8519 +/.1029 9.8519 +/.1029 9.8519 +/.1029 9.8519 +/.1029 9.8519 +/.1029
Relative Standard Deviation .0104 +/.1029 .0104 +/.1029 .0104 +/.1029 .0104 +/.1029 .0104 +/.1029
1 2 3 4 5
Exercise 3: This table shows the cycle times of the oscillating reaction with differing amounts of solution D. Trial # of drops of Solution D 4 Cycle Time (sec) 50 55 53 54 52 72 70 69 Avg. Cycle Time (sec) 52.8 Standard Deviation 52.8 +/.962 Relative Standard Deviation .962 +/.018
1
2
6
71
71 +/.791
.791 +/.011
Chem 104A 73 71 63 70 71 71 72
3
8
69.4
69.4 +/1.82
1.82 +/.026
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