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Chemistry: Matter and Change

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter2: Analyzing Data

Section: Chapter Questions

Problem 90A

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Related questions

Question

When you perform the following operations, how many significant figures should your answer have? Assume these are measured
quantities.
10.30 + 0.0100 =
O 1
O 2
O 3
O 4
O 5

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Perform the following mathematical operations, and express the result to the correct number of significant figures. a. 6.022 X 10-23 1.05 x 102 b. 6.626210342.9981082.54109 c. 1.285 102 + 1.24 103 + 1.879 101 d. (1.00866-1.00728)6.022051023 e. 9.8751029.7951029.875102100(100isexact) f. 9.42102+8.234102+1.6251033(3isexact)
One year of world production of gold was 49.6 106 troy ounces. One troy ounce equals 31.10 g. What was the world production of gold in metric tons (106 g) for that year?
Express the following measured values in scientific notation to the correct number of significant figures. a. 120.7 b. 0.0034 c. 231.00 d. 23,100
Express the measurements to the requested number of significant figures. (a) 96,485 J/C to three significant figures (b) 2.9979 g/cm3 to three significant figures (c) 0.0597 mL to one significant figure (d) 6.626 1034 kg to two significant figures
The label on a bale of mulch indicates a volume of 1.45 ft3. The label also states that the mulch in the bale will cover an area of a garden 6 ft 6 ft to a depth of 1 in. Account for the discrepancy in the given volumes.
How many significant figures are in each measurement? (a) 3.1416 degrees (b) 0.00314 K (c) 1.0079 s (d) 6.022 1023 particles
What is the difference between reporting the quantity nine inches as 9 inches and 9.00 inches?
What is the difference in surface area between two circles, one of radius 7.98 cm, the other of radius 8.50 cm? The surface area of a circle of radius r is r2. Obtain the result to the correct number of significant figures.
A listing of a house for sale states that there are 5bedrooms, 4000 ft2 of living area, and a living room with dimensions 1718.5 ft. How many significant figures are there in each quantity? (Your answer may include the words ambiguous and exact.)
Calculate the volume, in milliliters, for each of the following 75.0-g masses of substances. a. 75.0 g of gasoline (density = 0.56 g/mL) b. 75.0 g of sodium metal (density = 0.93 g/cm3) c. 75.0 g of ammonia gas (density = 0.759 g/L) d. 75.0 g of mercury (density = 13.6 g/mL)
When each of the following measurements of mass is converted to grams, using a conversion factor obtained from the relationship 1 pound = 453.6 grams, how many significant figures should the answer have? a. 6.4 lb b. 3.2091 lb c. 0.400040 lb d. 423,000 lb
A person weighed 15 pennies on a balance and recorded the following masses: 3.112 g 3.109 g 3.059 g 2.467 g 3.079 g 2.518 g 3.129 g 2.545 g 3.050 g 3.053 g 3.054 g 3.072 g 3.081 g 3.131 g 3.064 g Curious about the results, he looked at the dates on each penny. Two of the light pennies were minted in 1983 and one in 1982. The dates on the 12 heavier pennies ranged from 1970 to 1982. Two of the 12 heavier pennies were minted in 1982. a. Do you think the Bureau of the Mint changed the way it made pennies? Explain. b. The person calculated the average mass of the 12 heavy pennies. He expressed this average as 3.0828 g 0.0482 g. What is wrong with the numbers in this result, and how should the value be expressed?

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