Chemistry Scientific Notation

23 X 10^5 is not in proper scientific notation. Why?

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In the United States, 15,000,000 households use private wells for their water supply. Write this number in scientific notation.

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The U.S. has a total of 1.2916 X 10^7 acres of land reserved for state parks. Write this in standard form.

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Using Scientific Notation, rewrite the following number: 0.000882

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Using Scientific Notation, rewrite the following number: 8.82 x 10^-4

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Using Scientific Notation, rewrite the following number: 0.00000059

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Using Scientific Notation, rewrite the following number: 5.9 x 10^-7

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Using Scientific Notation, rewrite the following number: 0.00004

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Using Scientific Notation, rewrite the following number: 4 x 10^-5

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The nucleus of a human cell is about 7 X 10^-6 meters in diameter. What is the length in standard notation?

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