Syllabus Chem 5 2015 W B PDF

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Chem 005, Winter 2015. Syllabus...

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Chemistry 5 Quantitative Analysis (Winter 2015) Instructor: Professor Yinsheng Wang Office: Chemical Sciences 332 E-mail: [email protected] Office Hours: Professor Yinsheng Wang Monday, Friday 1:00-2:00 PM Course Instruction: MWF 11:10 AM-12:00 Noon; Engineering II, Room 138 Teaching Assistants Pengcheng Wang ([email protected]), Head TA Meredith Dinges ([email protected]) Nathan Hendricks ([email protected]) Yana Lyon ([email protected]) Chris Nellessen ([email protected]) Time and location for TA office hours will be posted on ilearn.ucr.edu. Textbook: Daniel C. Harris, “Quantitative Chemical Analysis” (Publisher: W. H. Freeman, 8th Edition). “Chemistry 5 Quantitative Analysis 2011 – 2012 Laboratory Experiments” (will be handed out during lab check-in). Grading Policy: Homework quizzes: Lab: Mid-term Exams (2 × 50 min): Final Exam:

10% 30% 30% 30%

No curve fitting will be used for the letter grade, instead the grade is dependent on the following percentages: A AB+ B BC+

100-90% 89-80% 79-75% 74-70% 69-65% 64-60%

C CD+ D DF

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59-55% 54-50% 49-47% 46-43% 42-40% below 40%

Calculators with log and antilog (log10X, 10x) keys are required, and should be brought with you to each exam and lab. The use of programmable calculators will not be allowed during exams. Laboratory Notebooks Laboratory notebooks should be hard-bound (e. g., Composition books) with each page numbered by you at the start of the quarter. Leave a couple of pages at the start for an index. All entries should be made directly into your notebook in ink. This includes all weights, so take your notebook with you to the balance room. Do not record your weights on slips of paper; they can be lost and readily cause transcription errors. Feel free to make notes in your book before the lab starts so as to know you should be doing that day. Lab notebooks will be collected by your TA at the end of the quarter, and will contribute to your lab grade. We are not looking for a work of art, but rather a comprehensive record of all your lab work. Preparation for each lab It is your responsibility to prepare for each experiment prior to coming to the lab. Therefore, the TA will inspect your Laboratory Notebook before you are admitted to each lab to make you that you set up your notebook for the experiment that is to be performed. Additionally, TAs may require that you pass either a written or oral quiz to determine whether you are prepared for the lab before you are allowed to begin each laboratory. The following sections of each experiment must be written up in your notebook prior to each lab. Name, the date, and the experiment number Title: Write the title of the experiment as listed at the top of the experiment in the lab manual. Analyte reported: Write down the chemical species which was analyzed by this particular experiment. Either chemical symbols or full names are acceptable. Unknown Number: You must leave space for the number of unknown sample on the report. If you are unsure with your correct unknown number is, ask your TA before you begin your experiment. The equations of the reaction: You should show the chemical reaction used for analyte determination. In some experiments, the analyte of interest undergoes multiple chemical steps during the analysis. In this case, list all obvious steps sequentially. Results: This is the most important section of your laboratory notebook. Here, you must enter in all the relevant data that you will collect during the experiment.

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Therefore, it is extremely important to organize this section before you begin the experiment. You should determine what experiments you will perform and leave appropriate sections available for use during the laboratory. For example, if you will be using a solid sample, you should create a table to record weights of each sample, so that when you weigh your sample, you can enter the appropriate numbers directly into your notebook. In many of these experiments, you will be recording the results of multiple titrations. Therefore, it will be very important for you to organize your data tables prior to the experiment. Be sure to leave enough room in your notebook (at least one page for each titration) so that you can record the data properly. Calculations: In this section, you should show all of the relevant formulas that you will be using in this experiment. This section will be closely examined by your TA to determine if your calculations are correct. If you want partial credit, make sure that you fill out each equation clearly and concisely. In some experiments, you will use known samples in addition to your unknown samples for the purpose of standardizing reagents. In such cases, you should also show your sample calculations for trial number one of the standard sample. Graphs and Plots Sometimes an experiment will require the preparation of graphs or plots. For such experiments, these items can either be drawn in the notebook, or prepared in a spreadsheet and then pasted into the notebook. The use of spreadsheets for data preparation is recommended, since these programs will help you prepare neater and more interpretable results. Conclusions In this section, you should report the final results of your calculations. Here, you should summarize the results that you obtain, the precision of each measurement, and all other statistical functions of your data. This information can then be transferred directly to your report form. Laboratory Safety Rules: Safety goggles and lab coats must be worn in the lab at all times. Open toed shoes are not permitted. Make-up policy Homework assignments: Homework will be assigned on Monday of each week of class, and a quiz may be given at the end of each week to assess your progress. The best eight (of nine) quiz grades will be used to compute your overall grade, and no make up quizzes will be available. Examinations: If you miss a mid-term examination for a valid reason, your score for that exam will be determined based on the average score of the other two

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exams. However, you must satisfy the following conditions: 1) contact me prior to the examination, and 2) have the appropriate “documentation” (e.g., a doctor’s note). Laboratories: No make-up laboratories are offered. You are allowed to drop one lab, and that can be taken as one absence. Additional absences will be marked as 0 points, but if you have more than one unexcused absence, you will fail the course. Lab Grading: The laboratory experiments require you to document the concentration of some species (e.g., chloride, ascorbic acid) in a sample. All samples are different. You will perform each measurement in triplicate, and your grade is determined by how accurate each individual result compared with the correct value. A perfect score for most experiments is when your answer is within ~0.2% (relative) of the correct value for all three determinations. If your answers differ by more than 10 parts per thousand you should do additional determinations. Outliers can be rejected with the Q-test, but all results must be shown. The amount of sample you are given is limited, so do not waste it. Drop Policy Any student registered in Chem 5 can drop the course without getting a “W” on the transcript before Friday, Jan. 16, 2014. Cheating Policy First Offense: The grade for that exam/lab/quiz will be zero. Second Offense: Failing grade for the course. This policy applies to exam, quiz, and labs.

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Lecture Schedule for Winter Quarter, 2015 Lecture #1 Lectures #2-3 Lectures #4-6 Lecture #7

Jan. 5 Jan. 7,9 Jan. 12, 14, 16 Jan. 19 Jan. 21

Jan. 23 Lectures Jan. 26, #8-9 28 Lecture Jan. 30 #10 Lectures Feb. 2, 4, 6 #11-13 Lectures Feb. 9 #14-15 Lecture Feb. 11, #16-17 13 Feb. 16 Feb. 18 Lectures Feb. 20, #18-19 23 Lectures Feb. 25, #20-21 27 Lecture Mar. 2, 4 #22 Lecture Mar. 6 #23 Lecture Mar. 9 #24 Lecture Mar. 11 #25 Lecture Mar. 13 #26 Mar. 16

Introduction to Quantitative Analytical Chemistry and Statistics Review (Chapters 0 and 4) Errors in Chemical Analysis and Methods for Reporting Computed Data (Chapter 3) Gravimetric Analysis and Solubility Equilibria (Chapter 26) Campus holiday, No Class Precipitation Titration (Chapter 26) Mid-term Exam 1 Acid-Base Equilibria (Chapters 8 & 9) Buffer Solutions and Dissociation of Polyprotic Species (Chapter 9) Acid-base Titrations (Chapter 10) Complex Equilibria (Chapter 11) EDTA Titrations (Chapter 11) Campus holiday, no class Mid-term Exam 2 Fundamentals of Electrochemistry (Chapter 13) Electrodes and Potentiometry (Chapter 14) Redox Titrations (Chapter 15) Quantitative Absorbance Measurements (Chapters 17, 19) Introduction to Chromatography-Separation Equilibria (Chapter 22) Gas Chromatography (Chapter 23) Liquid Chromatography (Chapter 24) Final (3:00 PM-6:00 PM)

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