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Chapter 3: Q14P (page 62)
Rewrite the number 3.123 56 (卤0.167 89%) in the forms (a) number (卤 absolute uncertainty) and (b) number (卤 percent relative uncertainty) with an appropriate number of digits.
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Round each number as indicated:
You have a stock solution certified by a manufacturer to contain . You would like to dilute it by a factor of 100 to obtain . Two possible methods of dilution are stated below. For each method, calculate the resulting uncertainty in concentration. Use manufacturer's tolerances in Tables 2-3 and 2-4 for uncertainties. Explain why one method is more precise than the other.
(a) Dilute 10.00mL up to 100mL with a transfer pipet and volumetric flask. Then take 10.00mL of the dilute solution and dilute it again to 100mL.
(b) Dilute 1.000mL up to 100mL with a transfer pipet and volumetric flask.
Why do we use quotation marks around the word true in the statement that accuracy refers to how close a measured value is to the "true" value?
What is the true mass of water in vacuum if the apparent mass weighed in air at is ? The density of air is and the density of balance weights is . The uncertainty in the density of water in Table 2-7 is negligible in comparison to the uncertainty in the density of air.
Explain the difference between systematic and random error.
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