Separations: Chromatography of M&M and Ink Dyes Almost all substances we come into contact with on a daily basis are impure; that is‚ they are mixtures. Similarly‚ compounds synthesized in the chemical laboratory are rarely produced pure. As a result‚ a major focus of research in chemistry is designing methods of separating and identifying components of mixtures. Many separation methods rely on physical differences between the components of a mixture. For example‚ filtration takes advantage of substances
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ChEMBL CHEMBL17564 RTECS number PA1490000 Beilstein Reference 1718732 Gmelin Reference 59 3DMet B01450 Jmol-3D images Image 1 SMILES [show] InChI [show] Properties Molecular formula CH4 Molar mass 16.04 g mol−1 Appearance Colorless gas Odor Odorless Density 0.6556 g L−1 Melting point -182 °C‚ 90.7 K‚ -296 °F Boiling point -164--160 °C‚ 109-113 K‚ -263--256 °F Solubility in water 22.7 mg L−1 log P 1.09 kH 14 nmol Pa−1 kg−1 Structure Molecular shape Tetrahedron Dipole
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References: 1) E. Stahl‚ Thin Layer Chromatography‚ Springer-Verlag‚ New York‚ 1969 2) Camag Scientific‚ Inc.‚ 515 Cornelius Harnett Drive‚ Wilmington‚ NC 28401‚ phone 800-3343909‚ fax 919-343-1834 3) Desaga GmbH‚ P.O. Box 101969‚ D-69009 Heidelberg‚ Germany‚ phone 0-62-21-83590‚ fax 0-62-21-840887
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students to familiarize and perfect the simple distillation method to produce 4-Methylcyclohexene and to gain experience using an IR spectroscopy to characterize the product of the reaction in favor of equilibrium. B. Results and Discussion: C. Experimental: 24 mL of 4-methylcyclohexanol‚ 5mL of phosphoric acid‚ and 1mL of concentrated sulfuric acid was added to a 250 mL round bottom flask and mixed thoroughly with a magnetic stirrer. A simple distillation set up was installed with a 250mL round
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GAS LAWS Properties of Gases Gases expand into any available volume • gas molecules escape from open containers. Gases are completely miscible • once mixed they will not spontaneously separate. Gases are described in terms of T‚ P‚ V and n Volume‚ Amount and Temperature • A gas expands uniformly to fill the container in which it is placed – The volume of the container is the volume of the gas – Volume may be in liters‚ mL‚ or cm3 • The temperature of a gas must be indicated
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Gas Exchange To complete this worksheet‚ select: Module: Gas Exchange and pH Balance Activity: Animations Title: Gas Exchange Introduction 1. a. Describe the respiratory system role with oxygen and carbon dioxide. The respiratory system is responsible for the movement of gases involved in cellular metabolism. b. Why is oxygen needed? Oxygen is needed because it is used up during the aerobic breakdown of glucose. c. What generates CO2? Carbon dioxide arises from the aerobic
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reaction conducted in this lab‚ including appropriate phase symbols. Mg(s) + 2HCl(aq) --> H2(g) + MgCl2(aq) 2. Determine the partial pressure of the hydrogen gas collected in the gas collection tube. The partial pressure of the hydrogen gas is 1.07 atm 3. Calculate the moles of hydrogen gas collected. pv=mrt ; n= .0013mol of hydrogen gas 4. If magnesium was the limiting reactant in this lab‚ calculate the theoretical yield of the gaseous product. Show all steps of your calculation. 0.03184 g
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and their uses Exploration milestone-an overview. INTRODUCTION: By definition petroleum is a generic name for hydrocarbons‚ including crude oil‚ natural gas liquids‚ natural gas and their products. Petroleum comes from the Latin petra meaning rock or stone & oleum meaning oil. Petroleum occurs in the earth in combination of any of the four states: gas‚ liquid‚ semisolid‚ and solid. Chemically‚ petroleum is a mixture of carbon‚ hydrogen and oxygen (called hydrocarbons) with minor amounts of nitrogen
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Analysts expect gas prices to decrease or remain mostly flat not only in 2014‚ but for years to come. Nonetheless‚ drivers in some states will see higher prices at the pump‚ starting January 1. Gas prices may not have seemed all that cheap in 2013. But in fact‚ prices for the year as a whole were less expensive than they have been. According toAAA’s year-end report‚ American drivers paid $3.49 per gallon of regular‚ on average for 2013. That’s the cheapest per-gallon average since 2010; the national
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Review the behavior of the gas phase vs. the liquid phase. Solution: a) The volume of the liquid remains constant‚ but the volume of the gas increases to the volume of the larger container. b) The volume of the container holding the gas sample increases when heated‚ but the volume of the container holding the liquid sample remains essentially constant when heated. c) The volume of the liquid remains essentially constant‚ but the volume of the gas is reduced. The particles in a gas are further apart than
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