Unit 1.1 - Measurement Worksheet

Name
Date
Block
Unit 1.1 - Measurement Worksheet
For each of the following, write the measurement that you would record, then the number of significant figures
in the reading.
Scale
Recorded Measurement
1.
unit: meters (m)
2.
unit: meters (m)
3.
unit: meters (m)
4.
unit: meters (m)
5.
unit: meters (m)
6.
unit: meters (m)
7.
unit: meters (m)
8.
unit: meters (m)
Amount of Sig Figs
9. Why are significant figures important when recording data in the laboratory, but not important when
solving problems in your math class?
10. The scales shown in questions 1 & 2 (above) appear to be measuring an object of the same length.
Describe why these should not have the same recorded measurement and amount of significant figures.
How would the uncertainty in these two scales differ?
11. For each of the volume devices below record the scale reading to the correct number of significant figures.
scale
reading ________
uncertainty
________
scale
reading ________
scale
reading ________
uncertainty
________
9
A
10
B
uncertainty
________
11
C
scale
reading ________
uncertainty
________
D
scale
reading ________
uncertainty
________
E
12. Determine the amount of significant figures in each of the following:
a.
75.02 mm
d.
0.0049 g
b.
18.90 mL
e.
150 cm
c.
12 test tubes
f.
1.5 x 10 2 cm
13. Rewrite the quantity 0.0031904 kg to show:
a. 1 significant figure
b. 2 significant figures
c. 3 significant figures
14. Perform the following calculations and report the results with the correct number of significant figures.
0.0677
48.1 a. + 82.7655 c. 6.524 × 0.02
43.8316
b. − 29.5706
d. 0.0222 × 0.7000 × 8.702
8506
Accuracy & Precision
•
•
Accuracy is a measure of how close a measurement comes to the actual or correct value of the object
being measured.
Precision is a measure of how close a series of measurements are to one another.
15. Look at each target below and determine whether the situation is accurate, precise, both, or neither.
Accurate? Yes / No
Accurate? Yes / No
Accurate? Yes / No
Precise?
Precise?
Precise?
Yes / No
Yes / No
Yes / No
16. Each member of a lab group uses a triple beam balance to find the mass a 5.0 kg block. Their data is
shown in the table below.
Group #
Student 1
Student 2
Student 3
Group 1
5.07 kg
5.03 kg
4.91 kg
Group 2
5.02 kg
4.98 kg
5.01 kg
Group 3
4.91 kg
4.90 kg
4.92 kg
Group 4
5.09 kg
4.87 kg
5.13 kg
a. Which group’s data would be considered the most accurate? Explain your reasoning.
b. Which group’s data would be considered the most precise? Explain your reasoning.