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Unformatted text preview: be significant
only if the number contains a decimal point. Thus the number 1.0 mg has two significant figures, and
0.500 mg has three significant figures. The following two numbers further exemplify these rules: 0.00260740 (six significant figures) significant
ambiguous zeros 238,600 (four - six significant figures)
• Back Trailing zeros in numbers that do not contain decimal points may or may not be significant. The number
450 g has two significant figures if the number is 450 ± 10, and three significant figures if the number is
450 ± 1. The number of significant figures can be indicated unambiguously with scientific notation. The
number 450 can be written as 4.5 × 10 2 , if it has two significant figures, and as 4.50 × 10 2 , if it has three
significant figures. Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website 1 0 / Chemistry: The Study of Change
• Exact numbers are those obtained from a definition. When we say 100 cm = 1 m, both the 100 an...
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.
- Spring '08