Nahom Assefa CHM-201 General Chemistry and Laboratory I Laboratory 8. Spectroscopy Purpose: Spectroscopy is the study of matter interacting with electro-magnetic radiation (e.g. Light). In this lab‚ we will separate some light sources in to constituent colors and find out the wavelength of some atomic emissions. We will also try to compare the line spectra found from gas discharge tubes and flame emissions. Finally‚ we will measure
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Determining absorbance of various wavelengths of light for pigments present in Coleus plants Joseph Yung (King Yung) 212831426 Adrian Ionescu Section M 11 February 5‚ 2014 Absorbance Table Absorbance Spectra Figure 1: Absorption spectra of pigments found‚ through chromatography‚ within Coleus plants. The different wavelengths of light were determined by the use of a spectrophotometer Questions
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Name : Joanne Wong Student ID : 00000012636 (BM1/14) Title : Spectrophotometer and its function Introduction Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength.[1] It can measure any of the listed light ranges that usually cover around 200 nm - 2500 nm using different controls and calibrations. [1] There are a few types of spectrophotometer such as calorimeter‚ UV spectrometer‚ IR spectrometer‚ atomic
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Colorimetry Introduction Absorption Spectroscopic methods of analysis rank among the most widespread and powerful tools for quantitative analysis. The use of a spectrophotometer to determine the extent of absorption of various wavelengths of visible light by a given solution is commonly known as colorimetry. This method is used to determine concentrations of various chemicals which can give colours either directly or after addition of some other chemicals. As stated by the Beer-Lambert Law
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Introduction What is Protein? There are more than 300 amino acids in the nature. However‚ only 20 amino acids are joined by each other with peptide bonds in different sequences and numbers. These sequences are formed by helping of genetic information which is encoded in genes. So‚ each protein molecule has its own amino acid sequence. Proteins are most abundant long chain macromolecules in all cells and they serve as structure and function matter in cells of all living organisms such as hormones
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The Visible Spectra Of Orange Soda Pop Objective : To measure an absorbance value of the different colour solutions by using Spectrophotometry Introduction Spectrophotometry involves the use of a spectrophotometer. A spectrophotometer is a photometer (a device for measuring light intensity) that can measure intensity as a function of the color‚ or more specifically‚ the wavelength of light (nm). The instrument also can be use on biological sample such as chlorophyll pigments and
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Experiment 3 Spectrophotometric Analysis of Mixtures: Simultaneous determination of two dyes in solution Reading: Appendix J Harris‚ Section 2.5‚ Chapter 18‚ and Section 19.1 Introduction Spectrophotometric determinations based on the Beer-Lambert Law are among the most widely used analytical procedures. These methods involve the measurement of the fraction of incident electromagnetic radiation that is absorbed by a sample. To determine the concentration of a colored species in solution
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DATE PERFORMED: JANUARY 6‚ 2011 SPECTROPHOTOMETRIC DETERMINATION OF THE EQUILIBRIUM CONSTANT OF A REACTION ABSTRACT The objective of the experiment was to determine the equilibrium constant of the reaction forming ferric thiocyanate through the use of Spectrophotometry. For the calibration‚ five standard solutions were prepared‚ then their respective absorbance values that were obtained through the use of the spectrophotometer‚ were plotted versus the concentration of the analyte so that a calibration
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Chromatography of Photosynthetic Pigments Abstract In this experiment a process of chromatography was used to separate chlorophyll a‚ chlorophyll b‚ xanthophyll‚ and beta carotene. When these pigments were obtained they were used to measure the wavelengths by way of spectrophotometer of each and the total of all the pigments wavelength. Introduction Photosynthesis is a process by which plants use the sunlight to convert it from light energy into chemical energy. This equation shows us how
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Determination of Manganese in Steel Submitted by: ------------------- Date of Submission: 27.03.11 Objectives: In steel production aside the iron‚ which is the primary source‚ some amounts of manganese is used together with carbon. The objective of this experiment is determining the manganese amount in the steel compound by using UNICAM UV-VIS Spectrometer. Theory: Many molecules absorb ultraviolet or visible light. The absorbance of a solution increases
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