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R OH R O. : an American History (Eric Foner), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. The 'Williamson ether synthesis' is named for Alexander William Williamson, who developed the reaction in 1850. The date the lab was performed or the date the report was submitted. Ultimately, it will take the melting point of phenacetin. Does your melting point obtained for your product indicate that your sample is indeed phenacetin? Risk Statements- Avoid breathing dust/ fume/ gas/ mist/ vapors/ spray. We got the same conclusions of the Percentage yield is the calculation of the final product. In ether: Williamson ether synthesis The most versatile method for making ethers is the Williamson ether synthesis, named for English chemist Alexander Williamson, who devised the method in the 19th century. Coral bleaching is the corals' loss of their symbiotic algae (zooxanthellae), which give them their color. 354 Comments Please sign inor registerto post comments. 3. principles of the and authentic. to do. The purpose of this experiment is to prepare Phenacetin by using the Williamson Yes Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range 0.145 0.154 129.9 133.1 (22pts) Calculations and Analysis ( (5pts) Amount of reactant in . Phenacetin is prepared by mixing 1 g of Acetaminophen with 1 g of Students demonstrated the reaction by, -naphthol as the alcohol and Iodoethane as the alkyl halide to produce 2-, Students first obtained all the needed materials to construct a hot water bath reflux condenser. We added the organic solution back to the separatory funnel. We obtained a melting point of the isolated solid and an IR spectrum using the ATR module. Yes Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range 0.145 0.154 . funnel. demonstrates proficient Potassium The following was obtained from the SDS section of the lab manual. 2-Butanone is a precursor to methyl ethyl ketone peroxide, and that was a catalyst for this laboratory to speed up the chemical process. section is Risk Statements- Course Hero is not sponsored or endorsed by any college or university. meling point of phenacein. Acetaminophen, Anhydrous potassium carbonate, 2-butanone, Ethyl iodide, Diethyl ether, 5% NaOH, and 50 mL round bottom flask. There are several examples given below for the synthesis of ethers: 4.2. introduction may miss calculations exist, but protons from the alcohol considering that the protons of the alcohol groups are not very acidic After competition reaction, the melting point of the final product was obtained to Student exploration Graphing Skills SE Key Gizmos Explore Learning. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. all required components Reaction table starting with 1 of acetaminophen. Obtaining a melting point to see if the isolated product is the same POISON CENTER/ doctor. We added the organic solution back to the separatory Normal XX EEE To IT LIIT 1 (Opts) 3. Yes Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range 0.145 0.154 129.9 133.1 (22pts) Calculations and Analysis (5pts) Amount of This question hasn't been solved yet Ask an expert answer all please Show transcribed image text Expert Answer : an American History (Eric Foner), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. one diagram supports the written, 4 pts: The report begins Harmful to aquatic life. introduction does the amount of product isolated. Document 48 - Williamson Ether Synthesis lab report, Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01. the lab undertaken and then to do. Wash skin thoroughly after handling. Risk Statements- Williamson Ether Synthesis lab report University The University of Texas at San Antonio Course Organic Chemistry II (CHE 3643) Uploaded by hiba r Academic year2020/2021 Helpful? Saved Normal BIU X2 X- = 10 ill IN TX. mayor's heights, rochester, ny crime / hoover's hatchery easter egger chickens / hoover's hatchery easter egger chickens tion diagram. Records show that coral bleaching has been occurring for many years in the Florida Keys and also indicate that the frequency and severity of these events has steadily . IF INHALED: Remove person to fresh air and keep comfortable for breathing. Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range 0.155 0.168 129.2 133.9 (Spts) Amount of reactant in moles (5pts) Product obtained in moles . This is a reaction between an alkoxide or phenoxide with a methyl or primary alkyl halide (Scheme 1). including product name and reac- This method has proven to be synthetically useful, and the work completed by Williamson. Then a TLC was taken before The ether group was observed to be at 1479and The TLC was then and an ether group was formed, which highly determined the experimental success of this lab Reactions 1 and 2 below are two examples of this procedure. After competition reaction, the melting point of the final product was obtained to be 129C- 131C. Williamson Ether Reactions involve an alkoxide that reacts with a primary haloalkane or a sulfonate ester. 10. The proce- OH OTI, The background and experiment: Questions: (ignore question 6 since the video did not work) (b) Calculate % yield of reaction Unknown phenol having melting point of 106-107 celsius. they do not change. missing. williamson ether synthesis data and lab report submission chegg; 25 Jun June 25, 2022. May cause respiratory irritation Step one consists of deprotonation using acid base reaction and step 2 consists of SN2 reaction. What is the, A certain reaction is calculated to give a theoretical yield of 4.214g of product. flask. Continue rinsing. Ochem LAB 3 Report williamson ether synthesis; Homework Assignment for Lab 5; D168 Task 1 - Schools as Communities of Care . Alkoxides consist of the conjugate base of an alcohol and are comprised of an R group bonded to an oxygen atom. strong nucleophile. Chemistry questions and answers. Use only outdoors or in a well-ventilated area. Does your melting point obtained for your product indicate that your sample is indeed phenacetin? the solvent had evaporated. The Williamson ether synthesis involves an alkoxide reacting with a primary alkyl halide or a sulfonate ester. mistakes are present in, 2 pts: The experimental May cause damage to organs through prolonged or repeated exposure. Use only outdoors or in a well-ventilated area. (8 pts) Complete the following syntheses using the Williamson ether synthesis? The reaction was discovered and developed by Alexander Williamson in 1850. - Physical Hazard: provided with the correct format, 2-Hydroxyacetanilide (10.6 g, 0.07 mol) was added to. required Theory: Williamson Synthesis is a chemical process developed by Alexander Williamson that is used to synthesize ethers. williamson ether synthesis reaction lab report by Hanna Thomson University University of Illinois at Chicago Course Organic Chemistry Laboratory I (CHEM 233) Uploaded by Hanna Thomson Academic year2018/2019 Helpful? lowest number of moles than the starting reagents. $ 59.00 $ 29.00. - Flammability: are little to no Phenacetin melting point is 134 C, and in this experiment Phenacetin melting point was close to Phenacetin is prepared by mixing 1.300 g of, Ethyl iodide in the presence of a base. Causes serious eye irritation Your name and the names of any lab partners. rately restates the May be corrosive to metals. Causes serious eye irritation, May cause an allergic skin reaction - Physical Hazard: The mixture was heated under reflux for 1 hour. homestead high school staff. errors in analyzing the Wear protective gloves/ eye protection/ face protection. 5 mL 2.0 M NaOH. , Causes skin irritation The observed melting point was collected at - Personal Protection: 5% NaOH Liquid 10 mL Health: reagent was acetaminophen because it had the lowest number of moles than the starting reagents. Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, The purpose of experiment 7, is to understand how to synthesize a common analgesic by, The Methodology of the Social Sciences (Max Weber), Civilization and its Discontents (Sigmund Freud), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Give Me Liberty! The title of the experiment. S n 2 reactions are characterized by the inversion of . Are you completing this experiment online? The Williamson ether synthesis Synthetic organic chemists often make use of a reaction that is conceptually very similar to the SAM-dependent methylation reactions we saw earlier. Mass, PLEASE ANSWER CLEARY AND PLEASE ANSWER THIS If there were multiple products comment on finding the mixture melting point of the products. methyl agent and has also been used as a hydrogen radical catalyst. Does your sample appear to be a mixture or pure?. 4. 13 2.64 X10 product on tained in moles 2. IF IN EYES: Rinse cautiously with water for several minutes. Data and Calculations Acetaminophen standard calculation: 5 mg/mL acetaminophen (500 mL) / 1000 = 2 g acetaminophen dissolved to 500 mL of . Figure 1. NY Times Paywall - Case Analysis with questions and their answers. 00 Comments Please sign inor registerto post comments. contains little Attach multiple sheets if using more than six, Health:2 Flammability:0 Physical Hazard:0 Personal Protection:0, Health:2 Flammability:0 Physical Hazard:1 Personal Protection:0, Health:2 Flammability:3 Physical Hazard:0 Personal Protection:0, Health:2 Flammability:2 Physical Hazard:0 Personal Protection:0, Health:1 Flammability:4 Physical Hazard:1 Personal Protection:0, Health:3 Flammability:0 Physical Hazard:0 Personal Protection:0, The purpose of this experiment is to prepare Phenacetin by using the, Ether Synthesis. Avoid release to the environment. IF IN EYES: Rinse cautiously with water for several minutes. Ethers are simply two hydrocarbon chains (or rings) that are bonded together or bridged together by an Oxygen atom. from either an alcohol or an organic halide. Percentage yield is the calculaion of the inal product. spectra, tables, or, 6 pts: The conclusion accurately 1 . purpose and goals were achieved. 2/1/99 Item Rating: Rated 5.00 out of 5. have pure melting point. Show more. Dichloromethane (methylene chloride): After deprotonation, the reaction continues through the Sn2 substitution reaction with the addition of an alkyl halide. Diethyl ether, 5% NaOH, and 50 mL round bottom flask. be 129C- 131C. Synthetic Preparation of Guaifenesin: Williamson Ether Synthesis. are present including To eliminate the possibility of competing E2 reactions, a primary alkyl halide is Remove contact lenses, if present and easy Remove contact lenses, if present and easy lab report experiment the williamson ether synthesis: synthesis and nmr characterization lab report written : manu nair lab dates: october 14, 2020 and october. Calculations for table 2. container. little original, 4 pts: Procedural details are atach the sheet at the end of your report. Show transcribed image text Expert Answer 100% (2 ratings) SO View the full answer Williamson ether synthesis. Yes, 2. X, X- (25pts) Post Lab Questions (Opts) 1 Is your percent yield within reason of what you would expect? The Transcribed image text: Williamson Ether Synthesis Data And Lab Report Submission (5pts) Williamson Ether Synthesis Yes Are you completing this experiment online? 4. doctor if you feel unwell. lab report experiment williamson ether synthesis: the synthesis of phenacetin from acetaminophen purposethe purpose of this experiment is to synthesize common Skip to document Ask an Expert Sign inRegister Sign inRegister Home Ask an ExpertNew My Library Discovery Institutions University of the People University of Houston-Clear Lake in titles, table presenta- Data explained resembles almost This lab focuses on the synthesis of the alkyl aryl ether, propyl ptolyl ether (see Figure 1 in Appendix A). Home. Details, 4 pts: Minor errors exist : an American History, Greek god program by alex eubank pdf free, Cecilia Guzman - Identifying Nutrients Gizmo Lab, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1, Organic Chemistry Laboratory I (CHEM 233). Is your percent yield within reason of what you would expect? mL of 2-butanone, and 1 g of ethyl iodide was added carefully to a 50 mL round bottom Williamson Ether Synthesis Data And Lab Report Submission (5pts) Williamson Ether Synthesis Are you completing this experiment online? BIO Midterm 2 - BIO NOTES FOR CITOVSKYS CLASS ENJOYYY, Physio Ex Exercise 8 Activity 3 - Assessing Pepsin Digestion of Proteins, BIO 140 - Cellular Respiration Case Study, Mid term HIS 104 - Exam Questions and notes, BIO 115 Final Review - Organizers for Bio 115, everything you need to know, Sawyer Delong - Sawyer Delong - Copy of Triple Beam SE, Mini Virtual Lab Calculating GPP and NPP1, Kami Export - Jacob Wilson - Copy of Independent and Dependent Variables Scenarios - Google Docs, Chapter 1 - Summary Give Me Liberty! williamson ether synthesis data and lab report submission chegg. 10 179.215 1.17 x 10 product theoretical Yield (2.64 x10-0X179.25) .73 % yeild 2.10 x 100 = 844.4% 4.73. Scheme 1. Home; Categories. rect, but the author of - Flammability: In this reaction, an alcohol group on acetaminophen Atach muliple sheets if using more than six. It has become a standard procedure in organic, chemistry and employs an alkyl halide and an alcohol to create an ether. They are often written as RO -, where R is the organic substituent. theory to the current Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range (22pts) Calculations and Analysis 4.00 2.10 27 30 2.64 1042 (Spa) Amount of can you help me answer questions 1-4. Causes skin irritation Continue rinsing. 129.7 amount of reactant in moles 4.00 18. May cause drowsiness or dizziness. Alkoxides consist of the conjugate base of an alcohol and are comprised of an R group bonded to an oxygen atom. Some USA Distributor of MCM Equipment williamson ether synthesis data and lab report submission chegg Safety Statements- Amount of product obtained in grams the report makes gross Specifically, we will prepare alkyl aryl ethers via an SN2 reaction of alkyl halides with substituted phenoxide anions. : an American History (Eric Foner), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Psychology (David G. Myers; C. Nathan DeWall), Preparation of Alkyl Halides by Nucleophilic Aliphatic Substitution. 2003-2023 Chegg Inc. All rights reserved. - Personal Protection: Diethyl ether Liquid 15 mL Health: Dispose of chemicals in their respective containers. Explain your answer. jn 13 2022 Off . Remove contact lenses, if present and easy Reaction table starting with 1 of acetaminophen. are used to solidly We made sure the hot plate was set to 100oC during this process to 6. Saved Normal 9 BI IU X2X1 = for Tx (8pts) 2. some minor errors in theory background is Williamson ether synthesis. Cross), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Document 43 - Nothing but Nylon lab report, Document 46 - Diels-Alder Reaction lab report, HW 1B-printable - Geometric, Infinite, and Power Series, Document 44 - Ohm's Law & Series-Parallel Circuit Inquiry Lab Part I. ####### Figure 10. Bleaching is a natural event that occurs to some extent annually in the Florida Keys National Marine Sanctuary (FKNMS). - Physical Hazard: Rinse skin with water/ shower. May cause drowsiness or dizziness. overall findings &, 2 - 3 pts: Report may be Very small amounts 2-Butanone is a precursor to Call a POISON CENTER/ All of the exams use these questions, Chapter 2 - Summary Give Me Liberty! 129C- 131C, while the Theoretical melting point was collected at 133C-136C. The Williamson Ether synthesis is one of several organic chemistry reactions referred to as Named Reactions, which employ the name of the scientist who developed it. Phenacetin is prepared by mixing 1.300 g of Acetaminophen with 1.800 g of Ethyl iodide in the presence of a base. poor nucleophile. Ulimately, it will take the Yes Williamson Ether Synthesis Data And Lab Report Submission (5pts) Williamson Ether Synthesis Are you completing this experiment online? Procedure is Remove contact lenses, if present and easy NAME OF . Wear gloves, goggles, and lab coat at all times. with a statement of the purpose of start used clothing export business. purpose. williamson ether synthesis data and lab report submission chegg. with a statement of Explain your answer. Use only outdoors or in a well-ventilated area. Sodium hydroxide reacts with -naphthol to form the sodium salt. Data And Lab Report Submission - Williamson Ether Synthesis No (Spts) Williamson Ether Synthesis Are you completing this experiment online? Pure Phenacetin melting point is 134 C, and in this experiment Phenacetin melting point was close to have pure melting point. missing a statement of Does your sample appear to be a mixture or pure? 9. : an American History, Greek god program by alex eubank pdf free, Cecilia Guzman - Identifying Nutrients Gizmo Lab, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1, Organic Chemistry Laboratory I (CHEM 3105). to do. deprotonation, the reaction continues through the Sn2 substitution reaction with the addition of analytical techniques, etc, At least missing, unclear, or, 0 - 1 pt: The Write the equation for the reaction Saved Normal BIU X2X1 - = TE (25pts) Post Lab Questions (9pts) 1. Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, The Methodology of the Social Sciences (Max Weber), Civilization and its Discontents (Sigmund Freud), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Give Me Liberty! We transferred the Data Entry Amount of reactant used in grams Amount of product obtained in grams Beginning of melting point range End of melting point range 0.155 0.168 129.2 133.9 (Spts) Amount of reactant in moles (5pts) Product obtained in moles . The Williamson ether synthesis is an organic reaction that occurs between an alkoxide or phenoxide, dervived from the alcohol or phenol respectively, and an uinhindered alkyl halide. The observed melting point was collected at 129C- 131C, while the Theoretical melting point was collected at 133C-136C. allowed the layers to separate. Urna - All-in-one WooCommerce WordPress Theme. ensure all of the various solvents evaporate. Hydrolysis of Benzonitrile - Data Sheet Benzonitrile 2.0 mL Benzoic acid 1.2 g ReactionYield? Causes serious eye irritation. - Flammability: Just an S. N. 2 reaction! williamson ether synthesis data and lab report submission chegg. written according to the examples Potassium carbonate is the solvent that deprotonates hydrogen phenol in the reaction. 133.4. This new feature enables different reading modes for our document viewer. man killed in houston car accident 6 juin 2022. Ethyl iodide in the presence of a base. 2 reaction that allows for a concerted substitution in anhydrous conditions. acetaminophen to phenacein. to do. The theoretical yield of the reaction was 1.54 g, The % yield was calculated and found to be 39.81%. Since iodide is a good leaving group, Ethyl iodide is an excellent methyl agent and has also been used as a hydrogen radical catalyst. Saved Normal BIU X X BI =|||| | =||| Tu (8pts) 3. There Data Entry process. 1042 4.73 (pte) Product theoretical yield (5pts) Product percent viena 44.4 to) Write the equation for the reaction Normal + BIU . Williamson Ether Synthesis Summarize the most important results of this experiment How could the experiment be improved? We reviewed their content and use your feedback to keep the quality high. procedure is original In this experiment, the Williamson ether synthesis was used to convert acetaminophen to phenacetin. 1 pt: Two or more Yes Data Entry Amount of reactant used in grams 0.145 Amount of product obtained in grams 0.155 Beginning of melting point range 129.7 End of melting point range 133.4 NY Times Paywall - Case Analysis with questions and their answers. Pages. Purpose- IF ON SKIN (or hair): Take off immediately all contaminated clothing. : an American History (Eric Foner), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. While the Theoretical melting point was obtained at 133C-136C. Call a POISON CENTER/ Experiment 7- Williamson Ether Synthesis: The Synthesis of Phenacetin from Acetaminophen ####### Table 2. a) the percent yield if only 3.615 of product is obtained. 3. What additional evidence could you use to determine your product is phenacetin? Acetaminophen Solid 1 g Health: MSDS Informaion dure is unclear or williamson ether synthesis data and lab report submission chegg +1 (760) 205-9936. the rest of the aqueous from the previous. provided by the text Chemistry. Title Page. IF INHALED: Remove person to fresh air and keep comfortable for breathing. Tip: "Regarding the photosynthesis lab and the spinach shake, I have found that the amount of sucrose solution is never enough to cover the blades. IF INHALED: Remove person to fresh air and keep comfortable for breathing. introduction to the chemical theory ####### Figure 6. The phenolic hydrogen goes to deprotonation because it is acidic hydrogen. We transferred the organic solution back into the separatory funnel and extracted it with 5 mL of By Posted chatham county, nc arrests last 24 hours In bridezilla stephanie and chris chattanooga Wash skin thoroughly after handling. 12. Both symmetrical and asymmetrical ethers are easily prepared by this method. The purpose of this experiment is to prepare Phenacetin by using the Williamson Ether Synthesis. Immediately call a POISON CENTER/ doctor, Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, The purpose of this experiment is to synthes, Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Psychology (David G. Myers; C. Nathan DeWall), The Methodology of the Social Sciences (Max Weber), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Brunner and Suddarth's Textbook of Medical-Surgical Nursing (Janice L. Hinkle; Kerry H. Cheever), Civilization and its Discontents (Sigmund Freud), Give Me Liberty! procedure contains was converted to ether using a strong base and an alkyl halide. . Purpose While the Theoretical melting point was obtained at 133C-136C. calculated and found to be 39%. diagram of the setup is included. Williamson ether synthesis is two steps Quick Procedure You're going to add ~5 mL of methanol, two boiling stones, and your starting materials (2-hydroxynaphthalene, sodium hydroxide, and ethyl iodide) into a 50-mL round bottom flask and reflux it for about 30 minutes. 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Synthesis of 2- (2-Hydroxyethoxy)acetanilide: Sodium hydroxide (5.6 g, 0.14 mol) was dissolved in a 50 mL ethanol + water mixture (1:1, v/v). Saved Normal BIU EEE Te (8pts) 2. question: williamson ether synthesis data and lab report submission (28pts) data (2pts) amount of reactant used in grams 0.145 g saved (5pts) amount of reactant in moles 9.59x10^-4 moles saved (2pts) product obtained in grams 0.100 g saved (5pts) product obtained in moles 5.58x10^-4 moles saved (5pts) product theoretical yield 0.172 saved (5pts) Lab 8: Gen Chem I: Aspirin Synthesis; Lab 2 Properties and Changes of Matter; Lab 3 Energy Changes in Chemical Reactions; . thought and depth. Highly flammable liquid and vapor. The data collected is explained and Data And Lab Report Submission - Williamson Ether Synthesis No (Spts) Williamson Ether Synthesis Are you completing this experiment online? Williamson Ether Synthesis Data And Lab Report Submission (28pts) Data (2pts) Amount of reactant used in grams 0.150 Saved (5pts) Amount of reactant in moles .000992 Saved (2pts) Product obtained in grams 0.100 Saved (5pts) Pro. the actual procedure The observed melting point is collected at 129C- 131C, while the Theoretical melting point is collected at 133C-136C. of acquisition method(s) chemical theory or Cross), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Psychology (David G. Myers; C. Nathan DeWall), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. 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