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Elem Quantitative Analysis

by: Schuyler Nikolaus

Elem Quantitative Analysis CHEM 321

Marketplace > George Mason University > Chemistry > CHEM 321 > Elem Quantitative Analysis
Schuyler Nikolaus
GPA 3.72

Katherine Pettigrew

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Katherine Pettigrew
Class Notes
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This 23 page Class Notes was uploaded by Schuyler Nikolaus on Monday September 28, 2015. The Class Notes belongs to CHEM 321 at George Mason University taught by Katherine Pettigrew in Fall. Since its upload, it has received 30 views. For similar materials see /class/215241/chem-321-george-mason-university in Chemistry at George Mason University.


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Date Created: 09/28/15
Chem 321 012 Lecture Chapter 3 Experimental Error Significant Figures The number of significant figures is the minimum number of digits needed to write a given value in scientific notation without loss of accuracy Most significant figure the lefthand most digit the digit which is known most exactly Least significant figure the righthand most digit the digit which is known most exactly Counting Significant Figures Rules for determining which digits are significant 1A nonzero numbers are significant 2Zeros between nonzero numbers are significant 3Zeros to the right of the nonzero number m to the right of the decimal point are significant 4Zeros before nonzero numbers are not significant Significant Figures When reading the scale of any apparatus you should interpolate between the markings It is usually possible to estimate to the nearest tenth of the distance between two marks Scientific Notation Minimum of digits needed to write a given value in scientific notation without loss of accuracy Scientific Notation Exponential Notation How many significant figures in each number Write in scientific notation 1 00105 2 0050080 3 8050 X 10393 4 10200 Significant Figures cont Adding and Subtraction 1211 180 1013 Multiplication and Division 456 x 14 25608827515 Types of Error Systematic Errors Determinate Errors Instrumental errors ie scale calibrated wrong Repeatable error can be corrected for Le buret calibration Random Errors Indeterminate Errors Not waiting long enough for crucible to cool Positive or Negative Digital scale reading scale Breeze Unstable table Electrical noise Precision and Accuracy All measurements have error Precision measure of reproducibility of result Accuracy nearness to truth Cheryl Cynthia Carmen Chastity Want both precision and accuracy though both have possibility for error An ideal procedure provides both precision and accuracy Uncertainty Absolute Uncertainty Expresses margin of uncertainty associated with measurement ie digital scale is 1 00002 g Relative Uncertainty Compares absolute uncertainty with its associated measurement absolute uncertainty relatlve uncertalnty magnitude of measurement Percent Relative Uncertainty percent relative uncertainty 2 100 x relative uncertainty Propagation of Uncertainty When possible uncertainty is expressed as a standard deviation oras a confidence interval Applies only to random error Propagation of Uncertainty Addition and Subtraction uncertainty in and e4 2 x 612 622 632 Solve 10546 i 324 977 13 10282 i 260 Percent relative uncertainty Absolute Uncertainty Relative Uncertainty Chem 321 0122 Introduction Introduction Instructor Dr Katherine Pettigrew httpclasswebgmuedukpettigr My BackgroundResearch Experiences Inorganic Nanochemist with experience in synthesis and characterization primarily TEM transmission electron microscopy of nanomaterials Nanomaterial 1100 nanometers 1 nm 10399 meters nanoparticles nanotubes 3D nanoarchitectures aerogels TEM a type of microscopy that uses electrons to illuminate and create an image of a specimen Has a much higher magnification and resolving power than a light microscope Nanotechnology Size Comparison lt5 mmquot m mun1 a In limp ul mm Elonl can Wm VNANOPARTICLES 39 nane F lmlliunsl in mm quot r V picometers Nanotechnologu Size Comparisons WWW nsf govodlpapri0rilynanonanolnum bilm age Nanoparticle A solid particle in the 11000 nanometer range that could be non crystalline an aggregate of crystallites or a single crystallite Nanoscale particles have different properties from bulk and molecular material 1 eri I RTE T Fiberlike CNTs or bundles of CNTs primarily observed CNTs individual and bundles intersect each other CNTs bundles converge and diverge throughout the sample SWNTs ave 14 nm diameter range 11 to 18nm Residual catalyst particles with graphene coating 34A interlayer spacing Donutlike carbon nanoloops obsened catalysts used up leaving hallow core Lots of amorphous carbon coating CNTs Quantitative Chemical Analysis Principles of chemical analysis with emphasis on ionic equilibria Lab consists of gravimetric volumetric and instrumental methods illustrating the principal types of quantitative determinations 993 Handouts Syllabus Lab Reports Schedule Laboratory Policies General Instructions Syllabus Email kapettiqrewqmailcom kpettiqr0muedu Phone 703 9931084 Office hours MW 100pm 200pm Office location SampT1 326A Syllabus Texts Quantitative Chemical Analysis Seventh Edition by Daniel C Harris W H Freeman 2007 Web materials at httpbcsthreemancomqca7e such as pdf Lab Experiment to accompany the text A solution manual for the text is also available Lab Supplement LS Quantitative Chemical Analysis Lab Supplement by Abul Hussam GMU Did anyone find this at the Bookstore Syllabus Course Content Lecture Monday amp Wednesday 300350 PM Study timeoptional Monday amp Wednesday 350415 PM Exam I Wednesday Feb 25 300415 PM Spring Break March 9 amp 11 no class or lab Exam ll Wednesday April 08 300415 PM Last day of class Monday May 4 Final exam Monday May 11 130pm415pm Syllabus Class Content continued Laboratory About half Traditional Methods gravimetric analysis and titrations Traditional methods are labor intensive and slow but allow high precision if carefully done Other half Modern Methods using instruments Modern Methods can be faster but require more knowledge and various calibration methods Syllabus Tentative Lecture Schedule We normally run a little behind planned schedule but plan on having the midterms and final on listed dates You should read the relevant pages of the text before it is covered in class Most topics on exams will be covered in both lecture and in text Syllabus Lecture Style Mostly Powerpoint Problems on Whiteboardchalkboardtablet


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