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Worksheet 1  Calculations
Significant Figures
 the number of significant figures (sig. fig.) is a measure of
the degree of
uncertainty
in a measurement. There is experimental uncertainty
in the last significant figure of a measurement. The rules for sig. fig. are given in
Chapter 1.5.
All nonzero numbers are significant. Zeros between numbers are
significant. Zeros to the left of numbers are not significant. Zeros to the right of
numbers may be significant (in presence of a decimal point).
1. Express each of the following numbers in
scientific notation
and decide the
number of significant figures:
Scientific notation
sig.fig.
409.10
______________
_____
4091.00
______________
_____
0.004091
______________
_____
308,000
______________
_____
30,860.
______________
_____
0.00056030
______________
_____
Calculations with significant figures
 In
multiplication
or
division
, the
number of sig. fig. in the answer has only as many sig. fig. as the factor with the
smallest number of sig. fig.
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This note was uploaded on 12/05/2011 for the course CHEM 341 taught by Professor Skagg during the Spring '11 term at Indiana.
 Spring '11
 skagg

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