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Unformatted text preview: Chapter 1 Skill Building Exercises Measurement, Signiﬁcant Figures. Rounding, Precision and Accuracy 1. How many signiﬁcant ﬁgures in each of the following measurements?
3.121 m . 0.051 L . 0.0150 L 1.4K 104g . 120 ft . 200. K 2. Round the following numbers to 3 signiﬁcant ﬁgures. 2.35500 . 9.385 . 0.005454_ 3. Solve the following and express the answer in the correct number of signiﬁcant ﬁgures.
a. The average mass of 3 objects whose individual masses are 10.3 g. 9.334 g, 9.25 g. ' b. The volume of a metal block whose dimensions are 2.44 cm by 4.2 cm by 3.571 cm. c. Carry out the following operations and express your answer in the correct number of
signiﬁcant ﬁgures. (12.3 + 12.71]/0.560 = 155./[43.25  7.1) = 4. Four groups of students where charged with measuring the mass of 10.0 mL of a solution
of sugar water and from there to calculate the density. The actual mass of the 10.0 mL was
12.348 3. Given the data below. decide the precision and accuracy of each group. Use the
best set of data to calculate the density. Group A Group B Group C Group D
12.348 g 12.412 g 12.321 g 12.349 g
12.441 g 12.420 g 12.366 g 12.346 g
12.367 g 12.418 g 12.389 g 12.347 g
12.392 g 12.415 g 12.314 g 12.350 g
Accurate? _
Precise? Density = 5. Helium has a melting point of 272.3 °C and a boiling point of 268.6 0C. Express these
temperatures in both °F and K. Problem Solving Using Dimensional Analysis and Conversion Factors 6. How many mL in 2.2 quarts? 7. An Olympic sprinter can run the 100. M dash in less than 9.95 5. What is his average
speed in mi/hr? 8. A chemist needs 2.00 g of liquid compound as a reagent for a reaction. The density of
the liquid is 0.718 g/mL. What volume of the liquid should she use? If the compound
costs $3.51 per milliliter, what is the cost to purchase 100 mL of the reagent? 9. The U5. quarter has a mass of 5.67 g and is approximately 1.5 mm thick. How many
quarters would you need to build a stack that reaches a height of 575 feet (the height of
the Washington Monument)? How much would that stack of quarters weigh in pounds
(lbs)? How much money [in dollars and cents) is that stack worth? 10. CHALLENGE: Most Teﬂon frying pans are manufactured with a Teflon coating that is
1.00 mm thick. The density of Teflo is 0.805 g/cm3. How many grams are needed to coat
a pan with a surface area of 36.0 square inches? How many pounds of Teflo are needed to
coat 150 pans with the same area? (Be careful here about converting the area!) ...
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 Fall '07
 Hoyt
 Chemistry

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