8 math operations with exponential notation divide 42

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Unformatted text preview: ______ Back Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website 1 2 / Chemistry: The Study of Change _______________________________________________________________________________ EXAMPLE 1.8 Math Operations with Exponential Notation Divide 4.2 × 10 –7 by 5.0 × 10 –5 . •Method of Solution 4.2 × 1 0 –7 5.0 × 1 0 –5 Divide the coefficients, and subtract the exponent in the denominator from the exponent in the numerator. •Calculation = 0.84 × 10 –7–(–5) = 0.84 × 10 –7+5 = 0.84 × 10 –2 Because 0.84 is less than 1, the usual practice is to move the decimal point to give a coefficient between 1 and 10. Move the decimal point one place to the right, and add (–1) to the exponent. = 8.4 × 10 –3 •Calculator Calculation On most calculators, you would carry out the above division problem: 4.2 × 1 0 –7 5.0 × 1 0 –5 by entering the numerator first, then pushing the divide key [÷], and then entering the denominator followed by the [=] key. As before, the exponential key is used to enter exponents...
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.

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