01 Notes - Sig Figs and Sci Notation

# 01 Notes - Sig Figs and Sci Notation - Scientific Notation...

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Pluchino – Regents Chemistry Matter and Measurement – 01 Sig Figs and Sci. Notation Aim: How do we communicate quantities in chemistry? Do Now: Using the formula: density = mass/volume, what is the density of a sample that has a mass of 2.0 g and a volume of 3.0 mL? The number of digits allowed in a calculation is dictated by the precision of the measurement… Rules for Determining Significant Figures: 1. Non-zero numbers are significant (1-9) 2. Any zero between non-zero digits is significant (2008, 601) 3. Any zero to the right of both a decimal point and a significant digit is also significant (114.00, 630.0) 4. Place holder zeros are not significant (0.007, 0.0025) Practice: Determine how many significant figures are in each number. Circle zeros that are significant. 9,237.2 28.00 30,802.001 0.00034 0.00609 712.06 0.000005460 500 How are numbers that have an ambiguous number of significant figures dealt with?

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Unformatted text preview: Scientific Notation 1.23 x 10 11 Coefficient: greater than or equal to 1, but less than 10. Cannot be a double digit number! Exponent: provides information about how to move the decimal point. (+) Move the decimal point to the right (–) Move the decimal point to the left Express 500 to 1, 2, and 3 significant figures… 5 x10 2 5.0 x10 2 5.00 x10 2 1 sig fig 2 sig figs 3 sig figs Practice: Put the following numbers in scientific notation with 3 significant figures: 0.00477 56,000 289,000,000 0.00000880 Conclusions: Significant figures are related to the degree of precision in an instrument Not all digits will be significant… o Non-zero digits are significant o Zeros between non-zero digits are significant o Zeros to the right of a non-zero digit and a decimal point are significant o Place holder zeros are not significant Use scientific notation for ambiguous numbers...
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## This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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01 Notes - Sig Figs and Sci Notation - Scientific Notation...

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