LABORATORY MANUAL GENERAL CHEMISTRY CHM 152L

Laboratory Manual General Chemistry Chm 152l-Free PDF

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COURSE OBJECTIVES, Laboratory manipulations and operations including the use of a computer interfaced. spectrophotometer pH electrode and temperature probe. Chemical concepts and calculations using dimensional analysis. Including chemical synthesis thermodynamics kinetics equilibrium acids bases. and redox chemistry,Computer data collection and analysis. Construction of graphs and plots, Record keeping with emphasis placed on correct data collection and recording in a. permanent notebook,Critical analysis and interpretation of data. Grades will be assigned based on the grading scale and point assignments listed in the. course syllabus The point distribution is based primarily upon evaluation of the laboratory. notebook pre lab work and quizzes post lab work reported values for unknowns and a final. examination practical and or multiple choice In addition two short mini reports will be. required one for experiment B and another for the synthesis and purification experiment C and. analysis of the iron salt D E F, The recording of procedures data observations and calculations in a laboratory.
notebook in the proper format is a key aspect of this course The details on how the notebook is. kept and graded are provided starting on the next page The laboratory notebook will be checked. each lab period and it must be signed and dated after the last entry at the end of each lab period. by the TA or instructor Error analysis will be an important theme of post lab work done in the. lab notebook The notebook will be formally evaluated twice during the semester. Pre lab work begins by reading the experiment in the lab manual and concisely outlining. key aspects of the experimental procedure Pre lab questions must then be completed and a pre. lab quiz taken before starting the experiment Many of the questions on the pre lab quiz will be. similar to the pre lab questions The post lab work will involve calculation and analysis of data. and completing post lab work, Students will also submit results for unknowns that must be within given tolerance limits. to receive full credit Points for unknowns will be assigned on how close the student s answer is. to the correct answer Students may repeat any unknown using a new unknown sample checked. out from the TA with the best score contributing to their course points for that unknown Point. will be taken off for incomplete report sheets and repeats of unknowns. Be aware that the CHM 152 lecture and CHM 152L are different courses with separate. grades assigned for each Each course must be added or dropped separately The grade of. incomplete may be given only when a course is unfinished because of illness or other conditions. beyond the control of the student The deadline to drop is published in the Class Schedule. Revised 6 2016,THE LABORATORY NOTEBOOK,Introduction. The laboratory notebook serves several purposes the most important of which is to be the. permanent understandable record of data and observations taken during an experiment You. should be able to look at your notebook a year from now and be able repeat the experiment or. calculations Calculations should also be shown in the lab notebook using dimensional analysis. or unit cancellation If the same calculation is repeated several times the calculation can be. shown once and the rest of the results can be listed in a table If a spreadsheet is used to do the. calculations a copy of it can be taped into the lab notebook. Before you start an experiment you may wish to note key aspects of the laboratory. procedure in the notebook Any procedures not in the lab manual including changes to. procedures listed in the manual must be noted in the lab notebook The laboratory notebook used. for this course should be bound and have at least 50 pages not spiral. At the end of each class period the TA will put a line across the notebook page under the. last entry initial by the line and put the date and time They will do a quick check of the. notebook at this time and give you suggestions on how to improve your notebook Points will be. taken off if the notebook is not checked and initialed by a TA or instructor at the end of each lab. The notebook will be graded twice during the course of the semester One grading will be. done at random during the course of the semester and the second will be done after the last. experiment has been completed The notebook will be evaluated based on adherence to proper. format as explained below and will include observations data calculations and post lab work. for experiments completed Computer generated graphs should be trimmed to size and taped into. the lab notebook A copy of the grading sheet for the notebook can be found later in the. notebook information,Format of the Notebook, Write your name class number and section letter and the semester on the front of the. notebook For example,Joe Smith CHM 152L J Fall 2012. Also be sure to reserve the first two pages in the lab notebook for a Table of Contents All pages. used in the notebook must be numbered Numbering the first 50 pages before you start using the. notebook would be a good idea Certain rules need to be followed when keeping a scientific. laboratory notebook, 1 Record all data and observations directly into the notebook This is by far the most.
important rule in keeping a good laboratory notebook Do not transcribe from other. pieces of paper i e DO NOT record data on scraps of paper or in this manual and. then recopy the data into the notebook Write down exactly what you are doing and. your observations as you are doing it Errors in your procedure can be caught this way In. Revised 6 2016, addition all computer generated graphs must be printed and taped into the notebook on. the same day the data is collected Points may be taken off for writing data outside the lab. notebook or not taping graphs into your notebook on the same day they are collected. 2 Clearly identify all data graphs and axes and use correct units. 3 Use a black or blue ball point pen for all entries Do not white out erase or obliterate any. entry simply cross out mistakes with a single line the mistake should still be readable. and give a short note to explain the nature of the mistake e g misread Sometimes. you will find later that the entry was not a mistake after all and you may want to retrieve. 4 All the work in the notebook should be sequential going from oldest to newest entries. don t skip spaces You may however start a new lab period or a new experiment on a. new unused page If blank spaces are left in the notebook put an X through them. 5 Begin each page and new section of work with the date and title of the experiment i e. sections or parts of an experiment If when you stop work for the day there is space left. on the page for more entries enter the new date at that place when you resume work. unless you are starting a new experiment, 6 As mentioned above reserve the first two pages in the lab notebook for a Table of. Contents One convenient form for the Table of Contents is. Experiment A Calorimetry pp 4 11 9 6 12,Changes to Experimental Procedure pp 4 5 9 6 12. Data and Observations pp 5 6 9 9 6 12,Calculations pp 7 8 10 9 9 12. Data and Calculations pp 11 9 13 12, Note how the data and observations are intermingled with the calculations This student.
was completing the calculations each week instead of waiting to finish the whole. experiment This will be important since some of the experiments may take up to three. weeks to complete, 7 Before an experiment is started the entire experimental write up must be read As you. read it would be a good idea to note the objectives and key points of the experimental. procedure in your laboratory notebook This will prepare you for the experiment before. you come to lab, 8 Another important facet of scientific experiments involves the propagation of uncertainty. in measurements and calculations Use the correct number of significant figures as. outlined later in the introduction in collection of data and calculations to communicate. the uncertainty or precision of your final results. An example notebook page showing data collection and calculations can be found on page I 5. Note how data at the bottom of the page was lined through and not obliterated Also note how. unit cancellation was used when doing the calculation in the middle of the page Be sure to use. unit cancellation whenever possible,Revised 6 2016. Example Page from Laboratory Notebook,Revised 6 2016. CHM 152L NOTEBOOK GRADING SHEET,Name Dana ID Section Letter.
Locker Instructor TA, Note Each section will be worth a certain amount of points TAs will provide exact point. distributions For certain experiments the point distribution may be changed or other. requirements added,POINTS AREA,EARNED GRADED check indicates area is ok. 30 PTS General Mechanics of Notebook Entry, 3pts data was recorded directly into notebook very important. 3pts chronological order was use from older to new work no blank areas. 3pts student s name class and section letter appears on outside of notebook. 3pts all pages of notebook currently in use are numbered. 3pts current and complete table of contents, 3pts notebook understandable each page and each day s lab work started with title. and date also each new section of work readable, 3pts did not obliterate use pencil or white out but X or line out blank space.
3pts all data calculations use dimensional analysis and graphs are identified and. have correct units,3pts reasonable significant figures were used. 3pts notebook initialed and dated after each lab period s work. PTS All data observations procedures and calculation present in notebook. First Notebook Grading Second Grading,Experiment Letter A B C D E F. Procedure Outline Changes 3 3 2 3 3 3,Risk Assessment 1 1 1 1 1 1. Data Graphs 2 2 1 2 2 2,Observations 1 1 3 1 1 1,Calculations 3 1 3 3 3. PTS Post Lab Question s Work 5 5 5, TOTAL POINTS FOR THIS GRADING 60 1st and 70pts 2nd Grading.
Revised 6 2016, Special Notebook Instructions for Individual Experiments. Experiment A, Experimental Data Record all masses volumes and concentrations used. Calculations All time temperature data will be collected and plotted on a computer Tape. computer generated graphs into your notebook Record the initial and final temperatures. and the temperature change determined from each graph or trial in your lab notebook by. or on the graphs,Experiment B, Experimental data You will be doing the experimental work in groups but each of you. should maintain a copy of the data in your notebook and tape all graphs generated into. your notebook before leaving lab Make copies if needed. Calculations All calculations are to be done individually. Experiment C, Student teams formed from each lab bench will acquire the data The observations and. data for the synthesis of the iron salt should be copied into each student s notebook. Experiment D and E, Calculations Plot graphs on a computer Tape all graphs into your lab notebook during.
the lab period they are made Record key information such as slope and correlation. coefficients for Exp D and buret readings equivalence point etc for Exp E close to or. on the graphs taped into the notebook,Experiments F No separate instructions. Scientific Integrity, Scientific advances are based firmly on experimental observations and depend on. the accuracy and honesty of the experimental data The laboratory notebook must. preserve the sanctity of data and observations once the measurement is taken and. recorded it cannot be changed Dry labbing using fake data or using data from past. semesters is totally unacceptable because it negates the very basis of the scientific. method and is considered academic dishonesty Proven cases will result in serious. consequences such as failing the course,SAFETY IN THE CHEMISTRY LABORATORY. Laboratory safety is a core consideration before doing experimental work and involves the. prevention of and response to laboratory emergencies Good prevention is far better than someone. getting hurt This begins with always being aware of chemical and laboratory hazards Hazard. codes chemical labels and safety data sheets SDS or material safety data sheets MSDS are key. sources of information that help us prepare to work safely in a laboratory This information can be. used to do a risk assessment on the experiment you are about to do Certain rules need to be. Revised 6 2016, followed to keep you safe and you must know what to do in case of an emergency Chemical waste. management is another important aspect of a safe laboratory and a key regulatory compliance. Risk Assessment, A risk assessment analyzes what hazards will be encountered during an experiment or lab.
procedure how to mitigate them using precautions such as goggles gloves or a fume hood and. what should be done if something goes wrong There may be physical or chemical hazards. present that will be indicated in the experiment write up using hazard codes and other. information Labeling for reagent chemical bottles will always include hazard codes and or. special warning stickers If a chemical has a higher hazard more information can be obtained by. referring to the safety data sheet SDS and noting hazards and what precautions to use in. response to these hazards For every experiment you must outline the experimental procedure. and write a risk assessment that includes hazards and precautions before you start lab work. LABORATORY MANUAL GENERAL CHEMISTRY CHM 152L INTRODUCTION CHM 152L is the laboratory course that should be taken concurrently with CHM 152 the second semester of general chemistry It is assumed that the key techniques concepts and calculations covered in CHM 151L have been mastered CHM 152L will explore more complex chemical concepts and problem solving The topics of thermodynamics

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