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AP Chem Math Notes

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9/20/10 Math of Chemistry Notes: Types of Measurement: ?Quantitative- use numbers to describe ?Qualitative- use description without numbers ?4 feet-Quantitative ?Extra large-Qualitative ?Hot- Qualitative ?100?F- Quantitative **Scientist prefer to use: ?Quantitative- easy check ?Easy to agree upon, no personal bias ?Although the measuring instrument limits how good the measurement is. ?Scientists use two words to describe how good the measurements are ?Accuracy- how close the measurement is to the actual value ?Precision- how well can the measurement be repeated ?Accuracy can be true of an individual measurement or the average of several ?Precision requires several measurements before anything can be said about it SIGFIGS:

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