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Published byGerard Harrison Modified over 8 years ago

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TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… 1.Tenths 2.Ones 3.Hundreds 4.Thousandths 5.Thousands

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We use significant figures when doing data calculations in chemistry Significant figures are important because they tell us how good the data we are using are.

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Counting Significant Figures using the Atlantic/Pacific Rule

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Look for a decimal – Decimal point absent = Atlantic Ocean – Decimal point present = Pacific Ocean Start counting from first non-zero number How to count Significant Figures X X

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Decimal point absent: Start on Atlantic (right) side of # non-zeroStart counting with first non-zero digit & count until reach end of # 5400 m has 2 2 sig figs 5431 m has 4 4 sig figs

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Decimal point present: non-zeroStart counting with first non-zero digit & count until reach end of # 2545.300 g 0.004530 km has 7 7 sig figs has 4 4 sig figs Start on Pacific (left) side of #

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Every once in a while: 5300 cm A line above a zero means its significant _

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Let’s practice… get out your packet

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Multiplication and Division COUNT SIG FIG for each number Answer can only be as specific as least specific number. Ex: if one number has 3 sig figs and the other has 5 sig figs, you answer can only have 3 sig figs

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24.56 cm x 14 cm = 1. 343.84 cm 2 2. 343.8 cm 2 3. 343 cm 2 4. 340 cm 2 Answer: 340 ONLY 2 SIG FIGS 4 sig figs 2 sig figs

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Let’s practice… try number 1-3

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Addition and Subtraction Underline lowest place value. Answer can only be as specific as the least specific number

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Example 540 + 12.4 + 0.211 + 100 = 652.611 Tens Tenths Thousandths Hundreds Answer can only be as specific as the least specific number More specific Answer = 700

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422.63 cm 29.472 cm 115.9 cm ________________ + 568.002 cm 568.00 cm 568.0 cm 568 cm Answer: 568.O hundredths Tenths Thousandths Tenths

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