Chap._1_Significant_Figures

Chap._1_Significant_Figures - Chapter 1 Matter,...

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Chapter 1 Matter, Measurement, and Problem Solving Chemistry: A Molecular Approach , 1 st Ed. Nivaldo Tro 2008, Prentice Hall Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA
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Measurement and Significant Figures
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Tro, Chemistry: A Molecular Approach 3 What Is a Measurement? quantitative observation comparison to an agreed- upon standard every measurement has a number and a unit
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Tro, Chemistry: A Molecular Approach 4 A Measurement the unit tells you what standard you are comparing your object to the number tells you 1. what multiple of the standard the object measures 2. the uncertainty in the measurement scientific measurements are reported so that every digit written is certain, except the last one which is estimated
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Tro, Chemistry: A Molecular Approach 5 Estimating the Last Digit for instruments marked with a scale, you get the last digit by estimating between the marks if possible mentally divide the space into 10 equal spaces, then estimate how many spaces over the indicator mark is
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Tro, Chemistry: A Molecular Approach 6
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Tro, Chemistry: A Molecular Approach 7 Significant Figures the non-place-holding digits in a reported measurement are called significant figures some zeros in a written number are only there to help you locate the decimal point significant figures tell us the range of values to expect for repeated measurements the more significant figures there are in a measurement, the smaller the range of values is 12.3 cm has 3 sig. figs. and its range is 12.2 to 12.4 cm 12.30 cm has 4 sig. figs. and its range is 12.29 to 12.31 cm
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8 Counting Significant Figures 1) All non-zero digits are significant 1.5 has 2 sig. figs. 2)
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This note was uploaded on 02/19/2009 for the course CHEM 101 taught by Professor Rillings during the Spring '06 term at Clemson.

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Chap._1_Significant_Figures - Chapter 1 Matter,...

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