Brass Background The scientific concepts involved in this lab include Spectroscopy‚ Beer’s law‚ Calibration curve‚ concentration‚ and electronic transitions. The main objective of this experiment is to see how the percent composition of brass can be determined to verify the properties influenced by copper and zinc. Brass is a generic term for alloys of copper and zinc. The main technique used in this experiment is Spectroscopy. The three equations used in this lab are: Y = mx + b‚ where y = absorbance
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Year 12 Chemistry 2011 Student Handbook Table of Contents Errors 2 Significant Figures 2 States of Matter in Equations 2 Revision Hints 3 Equations 4 VCAA 2008-2011 Key Skills 6 Unit 3 VCAA Study Design 7 Unit 3 Timetable 8 Unit 3 Work Set Questions 10 Unit 4 VCAA Study Design 11 Unit 4 Timetable 12 Unit 4 Work Set Questions 14 ERRORS When instruments are manufactured‚ there is a specified uncertainty within which the instrument is designed
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CH 202 Breakdown UV/Vis: Molecules containing π-electrons or non-bonding electrons (n-electrons) can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals. The more easily excited the electrons (i.e. lower energy gap between the HOMO and the LUMO)‚ the longer the wavelength of light it can absorb. Conjugation raises the energy of the bonding orbitals and lowers the energy of the antibonding molecular orbital. This
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Background NMR spectroscopy is a well established method for structure determination of various organic molecules ranging from small molecules all the way up to large bio-molecules such as proteins‚ DNA and polysaccharides. The chemical environment surrounding each atom as well their proximity to other atoms in a molecule can be studied with various experiments‚ enabling high-resolution 3D-structure determinations as well as verification of the chemical structure. NMR spectroscopy is well suited
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Module 2 Mass Spectroscopy [pic] [pic] Diagram of a mass spectrometer Stage 1: Ionisation The sample is injected as a vapour and the atoms are bombarded by fast moving electrons. This causes the molecule to fragment into two or more pieces. When a molecule or part thereof fragments‚ one portion would be positively charged while the second portion will be uncharged. All uncharged fragments are ultimately lost in the machine as mass spectrometers only work with positive ions. Stage 2: Acceleration
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Callam 1/8 CHEM – 254 – WI -2009 Problem Set #1 – IR Spectroscopy - KEY 1. Which of the indicated bonds absorbs at the higher frequency in an IR spectrum? a. O or OH C=O > C-O b. N or NH C=N > C-N c. H or H C-H sp2 > C-H sp3 Callam 2/8 CHEM – 254 – WI -2009 2. What major IR absorptions are present above 1500 cm-1 for each compound? a. b. O sp3 C-H stretch 2950 C=O - ketone 1715 cm-1 cm-1 c. O sp3 C-H stretch 2950 cm-1 sp3 C-H stretch 2950 cm-1
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Identification of an Unknown Organic Compound The objective of this lab was straightforward. We were given an unknown compound and we were to perform an IR spectroscopy and as well as NMR spectroscopy. With the IR spectroscopy‚ I was able to name the functional groups I have on my compound and further confirmed my assumptions by looking at the NMR spectroscopy after. The unknown number I was given was number 203. The molecular weight of the compound was 121. From the molecular weight‚ I calculated the molecular
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com/sdek/abstract~content=a713491583~bd=enc [23 April 2006] 8. Volland W (2005)‚ Spectroscopy: element identification and emission spectra [online]. Available: http://www.800mainstreet.com/spect/emission-flame-exp.html 12. Wikimedia Foundation‚ Inc (2006)‚ Flame Spectroscopy [online]. Available: http://en.wikipedia.org/wiki/Spectroscopy#Flame_Spectroscopy [02 May 2006] 13. Wikimedia Foundation‚ Inc (2006)‚ Spectroscopy [online]. Available: http://en.wikipedia.org/wiki/Spectroscopy [02 May 2006] 14. Author unknown (2003)‚ Analytical
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CHEM 2303: ANALYTICAL CHEMISTRY II LECTURE 1 – INTRODUCTION‚ SAMPLE PREPARATION AND SPECTROPHOTOMETRY WHY STUDY ANALYTICAL CHEMISTRY? To gain a knowledge of the methods and strategies that have been developed to investigate the nature of the chemistry around and within us. To answer the age old questions: What is it? What is it made of? How does it work? We must learn the principles of chemical analysis and the array of strategies that have been developed to analyze chemistry. HOW DO WE ANALYZE
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| I am not a teacher but an awakener. - Robert Frost | | ------------------------------------------------- Top of Form Bottom of Form | | Quotations about Teachers and Teaching | A teacher affects eternity: he can never tell where his influence stops. Henry AdamsWhat nobler employment‚ or more valuable to the state‚ than that of the man who instructs the rising generation. Marcus Tullius CiceroThe important thing is not so much that every child should be taught‚ as that every
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