Five modern United States pennies are measured three times each on a balance, and their measured masses are compared to the actual mass of a penny (2.5000 grams according to US Mint). a. When looking at the precision of the balance, which would be more ideal: one relative standard deviation value for fifteen measurements or five relative standard deviation values for the five pennies?

Five modern United States pennies are measured three times each on a balance, and their measured masses are compared to the actual mass of a penny (2.5000 grams according to US Mint). a. When looking at the precision of the balance, which would be more ideal: one relative standard deviation value for fifteen measurements or five relative standard deviation values for the five pennies?

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter3: Statistical Tests With Excel

Section: Chapter Questions

Problem 2P

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Chemistry

Five modern United States pennies are measured three times each on a balance, and their measured masses are compared to the actual mass of a penny (2.5000 grams according to US Mint).

a. When looking at the precision of the balance, which would be more ideal: one relative standard deviation value for fifteen measurements or five relative standard deviation values for the five pennies?

2. What is the relationship between solubility and density? Why is it important to consider the solubility of substances when determining their densities?

3. Why is it ideal to use only 10 mL or greater of a liquid when calculating for density?

4. Assume you have stacked 5 liquids on top of one another in a column. Each liquid (3 mL) has varying densities. What will happen to the densities of the liquids if the volume of each increased?

5. What does percent error indicate: quality of instrument (refer to the balance and penny example in Problem #1) or quality of penny? Why?

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