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Illustrated Guide to Home Chemistry Experiments by Robert Bruce Thompson

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Chapter 5. Mastering Laboratory Skills

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Measurement Resolution and Significant Figures

Measurements are a key part of chemistry, so it’s important to understand them and their limitations. Some measurements, called counts, are exact. For example, if you have a bag of apples, you can count the apples and state definitively that the bag contains exactly eight apples. But most measurements are inexact. For example, although the label on a bag of rice may state that it contains two kilograms of rice, this is only an approximation ...

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