PAPER AND THIN-LAYER CHROMATOGRAPHY Lab 47 Michael Stravino‚ CHM 2211L‚ June 3‚ 2012 Abstract Thin-Layer Chromatography and Paper Chromatography can be used to identify identical compounds‚ unknown compounds‚ the number of components in a mixture‚ as well as other important uses not explored in this laboratory. This experiment explores these techniques to identify an unknown amino acid by TLC and analyze food colors using paper chromatography. By using 2.0 mL of dimethoxyethane and 18 mL of
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GRAVIMETRIC ANALYSIS OF A CHLORIDE SALT (2013) Report By: ____________ Lab Partner: ___________ Group: CHEM 1001 Tuesday AM‚ Group H Purpose: This lab was conducted in order to determine the content of chloride in an unknown salt‚ using gravimetric analysis. Theory: The salt chloride content is easy to find because it is slightly soluble‚ making it possible to turn it into a precipitate. A precipitate reaction can be done using silver
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blue and red wavelengths have more absorbance‚ the green doesn’t have a high absorbance. This lab is useful to help demonstrate the existence of various leaf pigments by using the process of paper chromatography.
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Name: ______________________________________________ CHEM 102 – SPRING 2014 Study Guide: Exam 1 The following questions should assist you in your preparation for Exam 1‚ but does not include everything that you are responsible for knowing for Exam 1. Use your textbook‚ class notes‚ and past homework assignments in addition to this guide to prepare for Exam 1. 1. What are the differences between solids‚ liquids and gases with respect to molecular velocity‚ density‚ shape and volume?
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Lab: investigating hooked law with springs Purpose: to find spring constants of different springs using the slope of a graph of change in heights vs. the weight force. Also‚ to be able to understand how spring constants change when you add springs in a series or paralle Pre lab predictions: We predicted that the graph of gravitational force (mg) as a function of stretch (delta x) would look like Data: Spring #1: y = 8.2941x + 0.0685 This table represents the different distances that
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Chapter 11 Gases assumes both shape and vol of the container compressible‚ form homogenous w/ 1 another D is smaller then liquids/solids and highly variable depending on T and P Kinetic Molecular theory 3/2RT = total kinetic energy ½ mu2 = average kinetic energy Urms speed of mol with average kinetic energy‚ its inversely proportional to the square root of M when T is the same EX. Determine how much faster a helium atom moves‚ on average‚ than a carbon dioxide molecule at the same temperature
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In the IUPAC system of nomenclature‚ functional groups are normally designated in one of two ways. The presence of the function may be indicated by a characteristic suffix and a location number. This is common for the carbon-carbon double and triple bonds which have the respective suffixes ene and yne. Halogens‚ on the other hand‚ do not have a suffix and are named as substituents‚ for example: (CH3)2C=CHCHClCH3 is 4-chloro-2-methyl-2-pentene. If you are uncertain about the IUPAC rules for nomenclature
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1. Indicators were identified with the observation that the colour of some flowers depend on soil composition Classify common substances as acidic‚ basic or neutral * An acid is a substance which in solution produces hydrogen ions‚ H+ or more strictly H3O+‚ sometimes called hydronium ions * A base is a substance which either contains the oxide O2- or hydroxide ion OH- or which in solution produces the hydroxide ion. * A soluble base is called an alkali Common properties of all acids:
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The Chemistry of Cosmetics Cosmetics are an excellent example of how discoveries in chemistry are part of our day-to-day lives. In fact‚ just reading the composition of any common cosmetic can become a chemistry class: water‚ emulsifiers‚ preservatives‚ thickeners‚ pH stabilizers‚ dyes and fragrances‚ combined in different ratios‚ for different purposes. The use of cosmetics – that is‚ chemical compounds to improve our appearance – is not a recent phenomenon. It is said that the Egyptian queen Cleopatra
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Multiple Choice: (42 points) Chapter 15: Principles of Chemical Equilibrium dynamic equilibrium equilibrium constant reversibility LeChâtelier’s Principle ICE table Q and Keq major species minor species Keq‚f vs Keq‚r rate constant vs. equilibrium expressions significance of magnitude of Keq equilibrium shift with concentration changes equilibrium shift with temperature changes equilibrium shift with volume changes Chapter 16: Acid-Base Euilibrium
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