CH204Lecture1Notes

# CH204Lecture1Notes - CH204 Experiment 1 Dr Brian Anderson...

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1 CH204 Experiment 1 Are the Densities of Coke and Diet Coke Different? d = m V Dr. Brian Anderson Spring 2009 Today Error in experimental data – Random – Systematic – Gross Accuracy and precision – Accuracy – how close your final answer is to the correct one – Precision – how close your data points are to each other More Today • Significant digits – Count ’em! – Add and subtract ’em! – Multiply and divide ’em! • Standard deviation – A statistical measure of random error • Quick look at Experiment 1

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2 Significant digits All non­zero digits are significant. There are only two cases when zeroes are not significant: 36000 0.0075 All other zeroes are significant. Significant zeroes “Captive” zeroes are significant: 36,003 1.0075 Trailing zeroes after a decimal place are also significant: 0.00750 Multiplying and Dividing Look for the number with the fewest digits , and use that many in your answer. 45,398 x 34.5 = 1,570
Adding and Subtracting Look for the number with the fewest decimal places , and use that many in your answer. 55.685 + 1.7 57.485 How much does a quarter weigh? Weigh a few more.

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## This note was uploaded on 05/06/2009 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas.

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CH204Lecture1Notes - CH204 Experiment 1 Dr Brian Anderson...

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