Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Calculate the percentage uncertainty for a mass of 50.0 g measured with an uncertainty of ± 0.5 g.
💡 Hint: Divide the uncertainty by the measured value and multiply by 100.
Question 2
Easy
If the length of an object is measured as 20.0 cm with an uncertainty of 0.1 cm, what is the percentage uncertainty?
💡 Hint: Apply the same formula as above.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What do you do with the percentage uncertainties when multiplying or dividing two values?
- Multiply them
- Add them
- Subtract them
💡 Hint: Remember the rule of uncertainty propagation.
Question 2
True or False: Absolute uncertainty is always more informative than percentage uncertainty.
- True
- False
💡 Hint: Consider what each value represents.
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Challenge Problems
Push your limits with challenges.
Question 1
A student measures a mass of a chemical as 12.5 g with a ± 0.2 g uncertainty and a volumetric reading of 4.00 mL with a ± 0.01 mL uncertainty. How do they report the density of the chemical with its uncertainty?
💡 Hint: Remember to convert the uncertainty into absolute values for final reporting.
Question 2
If the concentration of a solution is measured at 0.0500 M with a 0.0010 M uncertainty, and it's diluted by transferring to 200 mL while maintaining that uncertainty. What is the final concentration and its uncertainty?
💡 Hint: Consider dilution effects on concentration and how the uncertainties apply directly.
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