CHEM-UA 120 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Relative Atomic Mass, Atomic Number
7 Oct 2015
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Significant figures- the certain figures plus the first uncertain digit in a measurement. Case 3- zeros to the right of the decimal point are significant. Case 4- zeros to the left of the first non-zero digit are not significant. They are just examples of the scale of the number (0. 0000000313 is a very small number, small scale). The uncertain digit is the last digit in the number. Writing the 24 as 24. 00 shows the reader how confident the measurement i6. 00s. It is definitely on the 24 point (on a ruler, for example), but may be just a little off. 3000 -- there are about 3000 people at a concert. 3000 - uncertain about whether the 3 zeros are significant. Multiplication and division- the final answer in a multiplication or division should contain the same number of significant figures as the measurement with the least number of significant figures. Write down the conversion factor as an equality.
