Annotated List of Chemistry Laboratory Experiments with Computer Access
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2,4-Dichlorophenoxyacetic Acid
2,4-Dichlorophenoxyacetic acid 2,4-Dichlorophenoxyacetic acid IUPAC (2,4-dichlorophenoxy)acetic acid name 2,4-D Other hedonal names trinoxol Identifiers CAS [94-75-7] number SMILES OC(COC1=CC=C(Cl)C=C1Cl)=O ChemSpider 1441 ID Properties Molecular C H Cl O formula 8 6 2 3 Molar mass 221.04 g mol−1 Appearance white to yellow powder Melting point 140.5 °C (413.5 K) Boiling 160 °C (0.4 mm Hg) point Solubility in 900 mg/L (25 °C) water Related compounds Related 2,4,5-T, Dichlorprop compounds Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) 2,4-Dichlorophenoxyacetic acid (2,4-D) is a common systemic herbicide used in the control of broadleaf weeds. It is the most widely used herbicide in the world, and the third most commonly used in North America.[1] 2,4-D is also an important synthetic auxin, often used in laboratories for plant research and as a supplement in plant cell culture media such as MS medium. History 2,4-D was developed during World War II by a British team at Rothamsted Experimental Station, under the leadership of Judah Hirsch Quastel, aiming to increase crop yields for a nation at war.[citation needed] When it was commercially released in 1946, it became the first successful selective herbicide and allowed for greatly enhanced weed control in wheat, maize (corn), rice, and similar cereal grass crop, because it only kills dicots, leaving behind monocots. Mechanism of herbicide action 2,4-D is a synthetic auxin, which is a class of plant growth regulators. -
A Facile Procedure for the Generation of Dichlorocarbene from the Reaction of Carbon Tetrachloride and Magnesium Using Ultrasonic Irradiation
Molecules 2003, 8, 608-613 molecules ISSN 1420-3049 http://www.mdpi.org A Facile Procedure for the Generation of Dichlorocarbene from the Reaction of Carbon Tetrachloride and Magnesium using Ultrasonic Irradiation Haixia Lin *, Mingfa Yang, Peigang Huang and Weiguo Cao Department of Chemistry, Shanghai University, Shanghai, 200436, P.R. China *Author to whom correspondence should be addressed: e-mail [email protected] Received: 7 April 2003; in revised form: 7 July 2003 / Accepted: 20 July 2003 / Published: 31 July 2003 Abstract: An improved method for the generation of dichlorocarbene was developed that utilizes ultrasound in the reaction of carbon tetrachloride with magnesium. High yields of gem-dichlorocyclopropane derivatives can be obtained in the presence of olefins by this method. Keywords: Dichlorocarbene; gem-dichlorocyclopropanes; ultrasonic irradiation; olefin addition; magnesium Introduction Gem-dichlorocyclopropanes are valuable intermediates in organic synthesis [1,2]. They are typically prepared by the addition of dichlorocarbene to olefins under phase-transfer catalysis conditions [3-5]. Sonochemical generation of dichlorocarbene has also been reported [6-8]. The reactions of dichlorocarbene with olefins in solid-liquid two-phase systems using ultrasonication usually afford high yields of double-bond addition products. In addition, excellent yields of diadducts have been obtained from dienes and dichlorocarbene under ultrasonication and phase-transfer catalyst [9]. Molecules 2003, 8 609 Previously, we reported a novel route for the generation of dichlorocarbene by the reaction of carbon tetrachloride with magnesium in a neutral medium and hypothesized that the mechanism of these reactions might involve a single electron transfer [10]. However, these reactions suffered from several experimental drawbacks: some of the major ones being the sudden exotherm that occurs after an unpredictable induction period, foaming, and in some cases, the use of iodine as the activating agent. -
Why Some Migration Conditions for Plastics Are Not Appropriate for Other Fcms
Why some migration conditions for plastics are not appropriate for other FCMs. Peter Oldring Representing 18 associations directly or indirectly involved in FCMs FIP Network 25th May 2016 Parma 1 Extract from Executive Summary (p9) European Parliament report on 1935/2004 (May 2016) ‘As a general trend, stakeholders who are in favour of further EU level harmonisation recommend that EU specific measures should establish a single standard for analytical (testing) methods, such as composition determination, migration testing, risk assessment, but also specific methods for compliance enforcement, thus ensuring that the relevant FCM is tested by companies and competent authorities across the EU with one and the same method. Furthermore, the EU single standard for analytical (testing) methods should be specific for each FCM, thus reflecting its unique properties and avoiding situations where non-harmonised FCMs are tested with methods developed for harmonised FCMs, which could lead to misleading and debatable test results’ 2 DISCLAIMER . As chair of the 18 associations representing non- plastics, I will try and represent them. The initiative started with CEPE, EMPAC and almost immediately CES silicones joined. Other associations have joined since then. However, I have to understand and work with analytical data, in order to make decisions about and determine the safety of my company’s products. The work is embryonic, associations are still joining and the final format will certainly be different to that initially envisaged. 3 Associations participating in Initiative . ACE Beverage cartons – paper, plastics and aluminium flexible . APEAL Steel for rigid metal packaging . CEFIC-FCA Substance suppliers . CELIEGE Cork . CEPE Coatings for rigid metal packaging . -
Department of Chemistry
ST.PHILOMENA’S COLLEGE (AUTONOMOUS), MYSURU (AFFILIATED TO UNIVERSITY OF MYSORE) REACCREDITED BY NAAC WITH A GRADE COURSE – B.Sc Three-year six semesters Choice Based Credit System (CBCS) and Continuous Assessment & Grading Pattern (CAGP) Under Graduate Programme under Autonomous Structure Academic year 2018-19 onwards DEPARTMENT OF CHEMISTRY St. Philomena’s College (Autonomous) Mysuru. B.Sc., Chemistry Syllabus - CBCS Scheme 2018-19 onwards. Page 1 PREAMBLE For the development of any Society, Science education plays an important role. Chemistry, being a major component of Science, is one of the increasingly important disciplinary areas of Science. Chemistry, which is also studied at the Bachelor’s degree programme for years, has been witnessing a slow transition from an analog to a much- needed one. It is an experimental science and students need to be trained both in the theoretical & practical aspects to get expertise. Moreover, the topics prescribed should provide in-depth knowledge of the subject and also the relevant basic allied subjects. Under this context, in order to make the U. G. teaching more effective and meaningful, revamping the syllabus is the need of the hour. It is certain that systematic and planned curricula from first to the third year shall motivate and encourage students for pursuing higher studies in various disciplines of chemistry such as Inorganic, organic, Physical, Analytical and Bio-Chemistry. This curriculum also enables the students to shoulder the responsibility as chemists in chemical industry. Thus, an updated and content revision of UG Chemistry syllabus is essential to improve its quality at the National and International level and also to meet the present-day challenges of PG and research oriented work after the PG programme. -
Comparison of the 2,6-Dichlorophenolindophenol And
~ 112,8 mil 2,5 ~ iii 1112,S Iii ... IHIf_ Iii IIIIiiiiI :: Iii 1111/2.2 :: Iii IIm2.2 I.lol ~ UH~ I.lol ~ um_ III~u~.... "I"~ III~u~.... IIIII~ 1111,1.8 ""'~ 1111,1.25 1111,1.4 "'"~ II11,M ""'1.6 ""'1.6 MICROCOPY RESOLUTION TEST CHART MICROCOPY RESOLUTION TEST CHART NATIONAL BUREAU OF STANDARDS-1963-A NATIONAL BUREAU OF STANDARDS-1963-A' """,., ''''·'I'''~' .--. "- . Teclanicnl Bulletin No. 1023 • January 11TACKS Cpnlparison of the 2,6-Dichlorophenolindo phenol and 2,4-Dinitrophenylhydrazine Methods with the Cranlptoll Bioassay for Detenuining Vitanlin C Values in :Foods 12 By ELIZABETH M, HtW'STON, 1;"1.'/11;111., MUIIIIAY ~'ISIIER, biologist, a'tld ELSA ORENT-KEII.ES;' /Ullrilill'l/ I;/II'II,isl, 8/0'1'(/'/1. of Hilma'll. Nutrition and Home ECOIIO'II,.ics, AgricuUu'I"n[, Rt'HCIU'ch Adm'inist.Tution CONTENTS Jlagl: , Page Introduction ~""""""". 1 J Appendix A, summary of data ,Experimental dll'ocedure , , , , ' , 4 ' from the bioassay . " , ... , 22 Chemical pI1lScedure . """" 5 Appendix B. interference of glu- Biological Pi:ocedure ' , 7 ('oreductone in the RO and SUltS and dllkussion , , 10 1 RMOD 2,4-dinitrophenylhydra umm~ .. ,,;;!, ......... .. 18; zine methods , ... ,.,' 26 iteratoe citad "',',",. 19 I~ a:> ...- \. en ::I v C'l ~ ( 0::: ~ .INTRODUCTION t d'. .. ~ Th6l5.Rppli'tf\tion of chemical methods to the measurement of 8scor6Tc acicFin animal and vegetable tissues is often complicated by the presEfuce of interfering substances. The most troublesome of these are~he ascorbic-acid-Iike compounds which react in many respects Iik<rue m,corbic acid with the two most commonly used, reagents, 2,6-dichlorophenolindophenol and 2,4-dinitrophenylhy drazine. -
Chloroform 18.08.2020.Pdf
Chloroform Chloroform, or trichloromethane, is an organic compound with formula CHCl3. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE. It is also a precursor to various refrigerants. It is one of the four chloromethanes and a trihalomethane. It is a powerful anesthetic, euphoriant, anxiolytic and sedative when inhaled or ingested. Formula: CHCl₃ IUPAC ID: Trichloromethane Molar mass: 119.38 g/mol Boiling point: 61.2 °C Density: 1.49 g/cm³ Melting point: -63.5 °C The molecule adopts a tetrahedral molecular geometry with C3v symmetry. Chloroform volatilizes readily from soil and surface water and undergoes degradation in air to produce phosgene, dichloromethane, formyl chloride, carbon monoxide, carbon dioxide, and hydrogen chloride. Its half-life in air ranges from 55 to 620 days. Biodegradation in water and soil is slow. Chloroform does not significantly bioaccumulate in aquatic organisms. Production:- In industry production, chloroform is produced by heating a mixture of chlorine and either chloromethane (CH3Cl) or methane (CH4). At 400–500 °C, a free radical halogenation occurs, converting these precursors to progressively more chlorinated compounds: CH4 + Cl2 → CH3Cl + HCl CH3Cl + Cl2 → CH2Cl2 + HCl CH2Cl2 + Cl2 → CHCl3 + HCl Chloroform undergoes further chlorination to yield carbon tetrachloride (CCl4): CHCl3 + Cl2 → CCl4 + HCl The output of this process is a mixture of the four chloromethanes (chloromethane, dichloromethane, chloroform, and carbon tetrachloride), which can then be separated by distillation. Chloroform may also be produced on a small scale via the haloform reaction between acetone and sodium hypochlorite: 3 NaClO + (CH3)2CO → CHCl3 + 2 NaOH + CH3COONa Deuterochloroform[ Deuterated chloroform is an isotopologue of chloroform with a single deuterium atom. -
Ammonia Snow-Lines and Ammonium Salts Desorption ? F
Astronomy & Astrophysics manuscript no. aanda_ammonium-salts ©ESO 2021 April 22, 2021 Ammonia snow-lines and ammonium salts desorption ? F. Kruczkiewicz1; 2; 3, J. Vitorino2, E. Congiu2, P. Theulé1, and F. Dulieu2 1 Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France e-mail: [email protected] 2 CY Cergy Paris Université, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, LERMA, F-95000, Cergy, France 3 Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, Garching, 85748, Germany Received –; accepted – ABSTRACT Context. The nitrogen reservoir in planetary systems is a long standing problem. Part of the N-bearing molecules is probably incor- porated into the ice bulk during the cold phases of the stellar evolution, and may be gradually released into the gas phase when the ice is heated, such as in active comets. The chemical nature of the N-reservoir should greatly influence how, when and in what form N returns to the gas phase, or is incorporated into the refractory material forming planetary bodies. Aims. We present the study the thermal desorption of two ammonium salts: ammonium formate and ammonium acetate from a gold surface and from a water ice substrate. Methods. Temperature-programmed desorption experiments and Fourier transform infrared reflection spectroscopy were conducted to investigate the desorption behavior of ammonium salts. Results. Ammonium salts are semi-volatile species releasing neutral species as major components upon desorption, that is ammonia and the corresponding organic acid (HCOOH and CH3COOH), at temperatures higher than the temperature of thermal desorption of water ice. Their desorption follows a first-order Wigner-Polanyi law. We find the first order kinetic parameters A = 7.7 ± 0.6 × 1015 s−1 −1 20 −1 −1 and Ebind = 68.9 ± 0.1 kJ mol for ammonium formate and A = 3.0 ± 0.4 × 10 s and Ebind = 83.0 ± 0.2 kJ mol for ammonium acetate. -
Arxiv:0801.0028V1 [Physics.Atom-Ph] 29 Dec 2007 § ‡ † (People’S China Metrology, Of) of Lic Institute Canada National Council, Zhang, Research Z
CODATA Recommended Values of the Fundamental Physical Constants: 2006∗ Peter J. Mohr†, Barry N. Taylor‡, and David B. Newell§, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8420, USA (Dated: March 29, 2012) This paper gives the 2006 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. Further, it describes in detail the adjustment of the values of the constants, including the selection of the final set of input data based on the results of least-squares analyses. The 2006 adjustment takes into account the data considered in the 2002 adjustment as well as the data that became available between 31 December 2002, the closing date of that adjustment, and 31 December 2006, the closing date of the new adjustment. The new data have led to a significant reduction in the uncertainties of many recommended values. The 2006 set replaces the previously recommended 2002 CODATA set and may also be found on the World Wide Web at physics.nist.gov/constants. Contents 3. Cyclotron resonance measurement of the electron relative atomic mass Ar(e) 8 Glossary 2 4. Atomic transition frequencies 8 1. Introduction 4 1. Hydrogen and deuterium transition frequencies, the 1. Background 4 Rydberg constant R∞, and the proton and deuteron charge radii R , R 8 2. Time variation of the constants 5 p d 1. Theory relevant to the Rydberg constant 9 3. Outline of paper 5 2. Experiments on hydrogen and deuterium 16 3. -
NMR Chemical Shifts of Common Laboratory Solvents As Trace Impurities
7512 J. Org. Chem. 1997, 62, 7512-7515 NMR Chemical Shifts of Common Laboratory Solvents as Trace Impurities Hugo E. Gottlieb,* Vadim Kotlyar, and Abraham Nudelman* Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel Received June 27, 1997 In the course of the routine use of NMR as an aid for organic chemistry, a day-to-day problem is the identifica- tion of signals deriving from common contaminants (water, solvents, stabilizers, oils) in less-than-analyti- cally-pure samples. This data may be available in the literature, but the time involved in searching for it may be considerable. Another issue is the concentration dependence of chemical shifts (especially 1H); results obtained two or three decades ago usually refer to much Figure 1. Chemical shift of HDO as a function of tempera- more concentrated samples, and run at lower magnetic ture. fields, than today’s practice. 1 13 We therefore decided to collect H and C chemical dependent (vide infra). Also, any potential hydrogen- shifts of what are, in our experience, the most popular bond acceptor will tend to shift the water signal down- “extra peaks” in a variety of commonly used NMR field; this is particularly true for nonpolar solvents. In solvents, in the hope that this will be of assistance to contrast, in e.g. DMSO the water is already strongly the practicing chemist. hydrogen-bonded to the solvent, and solutes have only a negligible effect on its chemical shift. This is also true Experimental Section for D2O; the chemical shift of the residual HDO is very NMR spectra were taken in a Bruker DPX-300 instrument temperature-dependent (vide infra) but, maybe counter- (300.1 and 75.5 MHz for 1H and 13C, respectively). -
Estimation of Average Chemical Content in Textile Products XUE WU
Estimation of Average Chemical Content in Textile Products The case of polyester and polyamide Master of Science Thesis in the Master Degree Programme of Environmental Measurements and Assessments XUE WU Division of Environmental Systems Analysis Department of Energy and Environment CHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden, 2012 Report No. 2012:10 REPORT NO. 2012:10 Estimation of Average Chemical Content in Textile Products The case of polyester and polyamide XUE WU Division of Environmental Systems Analysis Department of Energy and Environment CHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden, 2012 Estimation of Average Chemical Content in Textile Products The case of polyester and polyamide XUE WU © Xue Wu, 2012 ESA Report No: 2012:10 ISSN: 1404-8167 Division of Environmental Systems Analysis Department of Energy and Environment Chalmers University of Technology SE-41296 Göteborg Sweden Telephone: +46(0)31-7721000 Cover: Textiles at home. Available at <http://www.tr169.cn/fad/zxjt/jczs/200809/113532.shtml> Printed by Chalmers Reproservice Göteborg, Sweden Acknowledgements I would like to thank all the people who have helped or supported me during my thesis work. First of all, I want to express my sincere gratitude to my examiner Professor Sverker Molander at the Division of Environmental Systems Analysis, Department of Energy and Environment, Chalmers, who introduced me to this challenging but also interesting topic. At the beginning I was worried about exploring the unfamiliar field-- Textile, but he encouraged me and guided me patiently. Many thanks also to my supervisors Kristin Fransson and Johan Tivander at the Division of Environmental Systems Analysis, Department of Energy and Environment, Chalmers, for their faithful supervision and precious insights they provided. -
Effects of Metabolic Inhibitors on the Translocation of Auxins
EFFECTS OF METABOLIC INHIBITORS ON THE TRANSLOCATION OF AUXINS By DAMELIS DIAZ DE CEQUEA q Licenciado in Biology Universidad of Oriente Cumana, Venezuela 1976 Submitted to the Faculty of the Graduate College of the Oklahoma State University in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE May, 1986 -rkto~~~ I 1:{ (; 0 5'/Je Cop " EFFECTS OF METABOLIC INHIBITORS ON THE TRANSLOCATION OF AUXINS Thesis Approved: 1251232 ~ ii ACKNOWLEDGMENTS I wish to express my most sincere gratitude to Dr. Eddie Basler for his guidance, time and training during the course of this research. I wish to thank Dr. Glenn W. Todd and Dr. Becky Johnson for being members of my graduate committee. I also want to thank Jean Pittman Winters, Trina Wheless, and Roberto Machado for their valuable help received during experiment preparations, and Bobby Winters for his time dedicated to preparing some of the computer programs. Special acknowledgement is due to my husband Hernan, my son Hernan Alejandro, and my family for their constant love and support during my graduate career, without them I would not have been able to achieve this goal. I want to express my gratitude to Dr. John Vitek, Assistant Dean of the Graduate Collage, and Dr. Glenn Todd, Botany Department Head, for giving me the opportunity to study in this University. Finally, I want to recognize the financial support received from Universidad de Oriente Cumana, Venezuela during my time in the U.S.A. iii TABLE OF CONTENTS Chapter Page I. INTRODUCTION. • . • • . • 1 II. MATERIALS AND METHODS....................................... 8 III. RESULTS ..•....•.................................•..........• 11 Comparison of the Effect of DCCD and1RIDS on the Tray~location of 2,4,5-T-1- C and IAA -1- C. -
The Use Op Cobalt-60 As a Radiotracer in a Study Op
THE USE OP COBALT-60 AS A RADIOTRACER IN A STUDY OP THE ANALYTICAL CHEMISTRY OF COBALT DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of the Ohio State University By DARNELL SALYER, B. S. The Ohio State University 1956 Approvec by: Adv^rer Department of Chemistry ACKNOWLEDGMENT The author would like to express his sincere appre ciation to Dr. T. R. Sweet for his guidance and advice during the period of this research. The author’s wife, Octavia Elizabeth Salyer, has been a source of help and encouragement during the con clusion of this work and the oreparation of the manuscript. Most of this work was completed while the author held graduate fellowships from the Cincinnati Chemical vVorks (1954-55) and the Central Division of the Allied Chemical and Dye Corporation (1955-56). The aid provided by these fellowsnips is gratefully acknowledged. ii Table of Contents Page INTRODUCTION ................................................ 1 THE ANODIC DEPOSITION PROBLEM........................... 9 Theory of Anodic Deposition ...................... 9 Conditions for the Deposition of C o b a l t ......... 13 Promising Methods, A Qualitative Study........... 16 Reproducibility, A Quantitative Study ........... 17 Nature of the Deposits................. ........... 27 Ignition of Deposits............................... 33 Summary of Optimum Conditions for Plating and Weighing...................................... 34 Preparation of the Standard Curve ................ 37 Interference Study.................................. 41 DETERMINATION OF SMALL AMOUNTS OF COBALT BY THE ISOTOPE DILUTION-ANODIC DEPOSITION' METHOD . 4 6 Separation of Cobalt from Iron............... 49 Conclusion................................... 49 A STUDY OF THE CATHODIC ElECTRODEPOSITION METHOD FOR oOBALT »»»»»••••»»»..»»•».»• 31 Previous W o r k ...................................... 53 Experimental.