Practice Quantifying Uncertainty In Reported Measurements (11.1.4) - Chapter 11: Measurement and Data Processing

Practice: Quantifying Uncertainty in Reported Measurements

Lesson 11.1.4Measurement and Data Processing

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9 questions

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6 sample questions

Question 1.
What is absolute uncertainty?
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Think about how a ruler marks measurements.
Question 2.
If a graduated cylinder shows 25.0 mL with a scale of 0.1 mL, what is the absolute uncertainty?
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Use half of the smallest division.
3Question 3.
What does absolute uncertainty represent?
- The difference from the true value
- The range in which the true measurement lies
- The total possible error
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Think about how we express measurements.
4Question 4.
True or False: Percentage uncertainty allows comparison of measurements with different units.
- True
- False
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Percentage uncertainty is uniform for direct comparisons.
Question 5.
You measure the mass of a chemical as 15.0 ± 0.1 g and the volume as 20.0 ± 0.2 mL. Calculate the density and the associated uncertainty.
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Use the techniques for propagation of uncertainties learned earlier!
Question 6.
A reaction produces a gas whose volume is recorded as 30.0 ± 0.5 mL every minute for 5 minutes. Calculate the total volume produced and its uncertainty.
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Remember to multiply for the total but pay attention to how the uncertainty adds up!

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