A subtract 28712 95333 b 725 10 12 9 2 c 60 521 4781

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Unformatted text preview: uide TOC Textbook Website MHHE Website Chemistry: The Study of Change / 1 3 _______________________________________________________________________________ EXAMPLE 1.10 Significant Figures Carry out the following operations, rounding off the answer to the correct number of significant digits. a. Subtract: 287.12 –95.333 b. 7.25 × 10 12 ÷ 9 2 c. (6.0 + 5.21) = 4781 •Method of Solution a. Answer: 191.79. Only two digits to the right of the decimal are significant. b. Answer: 7 .9 × 10 10 . Two significant figures. c. Answer: 2.34 × 10 –3 . Three significant figures. _______________________________________________________________________________ EXERCISES 10. Express the following numbers in scientific notation: a. 24,000 b. 0.00014 c. 740,000,000 d. 0.0906 11. Write the following exponential numbers as ordinary numbers by moving the decimal point in the proper direction: a. 5.2 × 10 –3 b. 1.4 × 10 3 c. 7.5 × 10 6 d. 7.06 × 10 –5 12. Determine the number of significant figures expressed in the follo...
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