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01.07 Accuracy and Precision

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tina harris

on 1 July 2014

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Transcript of 01.07 Accuracy and Precision

01.07 Accuracy and Precision
Part 1 Density Of Unknown Liquid
Part II: Density of Irregular-Shaped Solid
Calculate the volume of the irregular-shaped solid for each trial. (Subtract the volume of the water from the total volume of the water and solid.)
Trial 1:
53.91-48.92=4.991

Trial 2:
55.0-50.0=5.01

Trial 3:
55.05-50.05=5.001
Part III: Density of Regular-Shaped Solid
Calculate the volume of the regular shaped solid for each trial.
(Multiply the length × width × height for each trial to get the volume in the unit cm3.)
Trial 1:
5.250x3.0x2.50=39.40

Trial 2:
5.0x4.0x3.0=60

Trial 3:
4.50x3.50x2.0=32.0
Questions and Conclusions:
1. How would you determine the proper number of significant figures of a liquid using a graduated cylinder? (See practice interactive in "Activity" tab of lesson.)
Ascertain as much from the nearest possible increment on the graduated cylinder the unknown variable.
Calculate the mass of the liquid for each trial. (Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder with liquid.)
Trial 1
35.46-25.3=10.16

Trial 2
36.01-25.39=10.62

Trial 3
36.41-26.03=10.38
Calculate the density of the unknown liquid for each trial. (Divide the mass of the liquid calculated above by the volume of the liquid.)
Trial 1:
10.16/8.12=1.25

Trial 2:
10.61/8.26=1.28

Trial 3:
10.38/8.52=1.22
Calculate the density of the irregular-shaped solid for each trial. (Divide the mass of the solid by the volume of the solid calculated above.)
Trial 1:
42.313/4.991=8.4626

Trial 2:
40.65/5.01=8.130

Trial 3:
40.959/5.00=8.2746
Calculate the density of the regular-shaped solid for each trial. (Divide the mass of the solid by the volume calculated above.)
Trial 1:
25.95/39.40=0.659

Trial 2:
27.6/60=0.46

Trial 3:
25.6/32.0=0.80
2. Can just one measurement be considered precise? Can just one measurement be considered accurate? Explain your answers completely.
Only one measurement cannot be precise, as it would be unable to compare it to other measurements, as there would be none. Accuracy is attainable for just one measurement, so long as it near enough to the accepted value.
3. In parts II and III of the lab you used different sized objects in each trial. Compare the density values that you calculated for these items, how do the three trials compare? The trials have both accuracy and precision. The densities were constantly with less than one point of value difference.
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