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Scientific Measurement

Scientific Measurement. Chemistry Unit 2 Podcast 2.1 Scientific Notation . Scientific Measurement. Using and Expressing Measurements Measurements in chemistry often involve very large or very small numbers EXAMPLE.

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Scientific Measurement

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  1. Scientific Measurement Chemistry Unit 2 Podcast 2.1 Scientific Notation

  2. Scientific Measurement Using and Expressing Measurements • Measurements in chemistry often involve very large or very small numbers • EXAMPLE. 2 grams of Hydrogen = 602,000, 000,000,000,000,000,000 hydrogen atoms.

  3. Scientific Notation • Scientists use “Scientific Notation” to write numbers in Exponential form • Notation is based on powers of _____ 10 = 101 100 = 102 1000 = 103 10,000 = 104 100, 000 = 105

  4. Writing Numbers with Scientific Notation • Move or add a decimal point so that only _______ digit is in front of the decimal. • Write __________ • Count the number of decimal places you moved and write that number as superscript. • Look which way you moved the decimal • Left = + superscript or Right = − superscript • Left LARGER • Right REDUCES

  5. Put the following numbers into or take them out of Scientific Notation: 1) 13400000 2) 0.000724 3) 5.903 x 10-8 4) 6.20 x 103

  6. Calculations with Numbers in Scientific Notation Addition: Change exponents so they match EX. 1.03 x 103 + 2.10 x 102 = 10.3 x 102 + 2.10 x 102 = 12.4 x102 Answer = 1.24 x 10 3

  7. Subtraction: Change exponents so they match EX. 1.03 x 103 - 2.10 x 102 = 10.3 x 102 - 2.10 x 102 = 8.2 x 10 2

  8. Multiplication: Multiply numbers and add exponents EX. 1.03 x 103 x 2.10 x 102 = (1.03 x 2.10) x 10 (2+3) = 2.16 x 10 5

  9. Division: Divide numbers and subtract exponents EX. 1.03 x 103 / 2.10 x 102 = (1.03 / 2.10) x 10 (3-2) = 0.490 x 10 1 = 4.90

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