Sig figs, rounding off, dimensional analysis

Sig figs, rounding off, dimensional analysis - Chem 16...

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Unformatted text preview: Chem 16 Significant figures I. Examples 1. 0.001 – 1 sig fig 2. 0.050 – 2 sig figs 3. 0.100 – 3 sig figs 4. 2.000 – 4 sig figs 5. 5000 – 1 sig fig 6. 500.0 – 4 sig figs 7. 4010 – 3 sig figs 8. 3500 – 2 sig figs 9. 6.022 X 10 23 – 4 sig figs II. Exact numbers - have an infinite number of significant figures  Example: 1 dozen = 12 pieces - conversion factors have infinite number of significant figures  Example: 1 kilogram = 2.205 pounds III. Significant figures in calculations - Multiplication and division : significant figures are determined by the quantity with the least number of significant figures Examples: 1. 63.2 X 54 X 2.000 = 6825.6  6800 2. (5460 X 2877)/460 = 34148.73913  34000 3. A dozen of pencils costs P 38.76. How much will 3 dozens cost? Answer: 38.76 X 3 = 116.28  116.3 not 100 because 3 is an exact number and has an infinite number of significant figures. As a consequence, 38.76 has the least number of significant figures thus the final answer should have the same number of significant figures. significant figures thus the final answer should have the same number of significant figures....
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This note was uploaded on 08/31/2010 for the course IC 10 taught by Professor Mapas during the Spring '10 term at University of the Philippines Diliman.

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Sig figs, rounding off, dimensional analysis - Chem 16...

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