Problem Set 1 Key CHEM103A Dr. Keller

# Problem Set 1 Key - CHEMISTRY 103A Sections 7-10 Problem Set 1 8 Points Answer Key Problems 1-3 deal with expressing numbers in scientific notation

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12 14 100 8.94238352200861 10 8.94238352200861 10 1 pennies dollars pennies dollar i = 14 12 2.50 1 8.94238352200861 10 2.24 10 1 1000 g kg pennies kg penny g = CHEMISTRY 103A, Sections 7-10 Problem Set 1: 8 Points Answer Key Problems 1-3 deal with expressing numbers in scientific notation and unit conversion. According to a US Treasury Department web site (http:// www.treasurydirect.gov/NP/BPDLogin?application=np ) the national debt on August 9, 2005 was 7.88007870808637 trillion dollars. According to the same web site, the debt on August 6, 2007 was \$8,942,383,522,008.61. Problem 1. Express the dollar increase between 2005 and 2007 in scientific notation . Use fifteen significant figures. Scientific notation always has the form n.nnn x 10 p . You can add or subtract numbers in this form if the power of ten (p) is the same for both. A trillion is 1,000,000,000,000 or 1 x 10 12 . The 2005 debt number is therefore 7.88007870808637 x 10 12 (15 sig figs). The 2007 figure in scientific notation is

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## This homework help was uploaded on 04/14/2008 for the course CHEM 103a taught by Professor Weso during the Fall '08 term at University of Arizona- Tucson.

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Problem Set 1 Key - CHEMISTRY 103A Sections 7-10 Problem Set 1 8 Points Answer Key Problems 1-3 deal with expressing numbers in scientific notation

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