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Chap._1_Precision_&_Accuracy

Chap._1_Precision_&_Accuracy - • we determine the...

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Chapter 1 Matter, Measurement, and Problem Solving Chemistry: A Molecular Approach , 1 st Ed. Nivaldo Tro 2008, Prentice Hall Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA
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Precision and Accuracy
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Tro, Chemistry: A Molecular Approach 3 Uncertainty in Measured Numbers uncertainty comes from limitations of the instruments used for comparison, the experimental design, the experimenter, and nature’s random behavior to understand how reliable a measurement is we need to understand the limitations of the measurement accuracy is an indication of how close a measurement comes to the actual value of the quantity precision is an indication of how reproducible a measurement is
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Tro, Chemistry: A Molecular Approach 4 Precision imprecision in measurements is caused by random errors errors that result from random fluctuations no specific cause, therefore cannot be corrected
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Unformatted text preview: • we determine the precision of a set of measurements by evaluating how far they are from the actual value and each other • even though every measurement has some random error, with enough measurements these errors should average out Tro, Chemistry: A Molecular Approach 5 Accuracy • inaccuracy in measurement caused by systematic errors errors caused by limitations in the instruments or techniques or experimental design can be reduced by using more accurate instruments, or better technique or experimental design • we determine the accuracy of a measurement by evaluating how far it is from the actual value • systematic errors do not average out with repeated measurements because they consistently cause the measurement to be either too high or too low Tro, Chemistry: A Molecular Approach 6 Accuracy vs. Precision...
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