Chemistry McMurry and Fay, 5th Edition - Welcome to Blinn 化学McMurry和Fay，第五版-欢迎的对象.pptVIP

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Chemistry McMurry and Fay, 5th Edition - Welcome to Blinn 化学McMurry和Fay，第五版-欢迎的对象.ppt

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Chemistry McMurry and Fay, 5th Edition - Welcome to Blinn 化学McMurry和Fay，第五版-欢迎的对象

Copyright ? 2008 Pearson Prentice Hall, Inc. Chapter 1: Chemistry: Matter and Measurement Copyright ? 2008 Pearson Prentice Hall, Inc. Chemistry and the Elements Elements and the Periodic Table Elements and the Periodic Table Elements and the Periodic Table Elements and the Periodic Table Elements and the Periodic Table Elements and the Periodic Table Elements and the Periodic Table Some Chemical Properties of the Elements Some Chemical Properties of the Elements Experimentation and Measurement Measuring Mass Measuring Length Measuring Temperature Derived Units: Measuring Volume Derived Units: Measuring Density Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Accuracy, Precision, and Significant Figures Rounding Numbers Rounding Numbers Rounding Numbers Rounding Numbers Rounding Numbers Rounding Numbers Calculations: Converting from One Unit to Another Calculations: Converting from One Unit to Another Calculations: Converting from One Unit to Another The assumption is that the analytical balance is properly calibrated. The data only varies in the fourth decimal place. The data varies in the first decimal place. While the accuracy is reasonable compared to the analytical balance, the precision is not. The bathroom scale is not something one would want to use for scientific measurements! It is possible to have good precision and poor accuracy. An instrument calibrated improperly, for example. Rules for counting significant figures (left-to-right): Zeros in the middle of a number are like any other digit; they are always significant. Zeros at the beginning of a number are not significant (placeholders). Zeros at the e