(lab discussion 8.2)
This week’s laboratory will extend your knowledge of chemical bonding through interacting with virtual simulations as in week’s past. Your initial post to the forum should be in response to the following:
Discuss the relationship of calculating lattice energy and the Born-Haber cycle.
Here are some suggestions of topics on which to elaborate upon in your explanations:
Your subsequent four posts to your peers and/or your instructor should further the discussion by elaborating on the objectives above. Do not include any results for your laboratory experiments. References must be provided for any content retrieved from credible sources.
(CHE 121 PROJECT Lab)
A lab-based project is a requirement for the lab portion of Principles of Chemistry I. The results of the project will be written as a report, the format of which will be the same used since the beginning of this course. The experiment will be performed in the eighth week of class, and the report will be due by the end of the term. Please read the description, guidelines, and advice that follow.
Purpose of the Project
Students taking a major’s level freshman science course should be able to analyze and report natural phenomena in a scientific manner. The writing of scientific reports and papers is necessary to advance in the scientific field.
Scientists communicate their discoveries to others via papers published in peer-reviewed journals. While I do not necessarily expect you to publish in Nature or The Journal of Physical Chemistry, nonetheless you should gain experience in the procedure to obtain at least some idea of the skills scientists must demonstrate and responsibilities they shoulder. This project is a tool to assess your ability to perform a much simpler, freshman version of the process. A large portion of your efforts this term have been procuring such styled reports of your findings, so you will rely on this experience for this investigation.
Nature of the Project
You will carry out a laboratory procedure to determine the concentrations of two unknown solutions.
Grading of the Project
The report will be scored using the rubric located in the course titled “Laboratory Report Grading Rubric.”
Format of the Report
The report will follow the same formatting guidelines as previously used in the reports for this course.
Vo, Kevin. (2019, September 19). Spectrophotometry. Chemistry LibreTexts. https://batch.libretexts.org/print/Letter/url=https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/Reaction_Rates/Experimental_Determination_of_Kinetcs/Spectrophotometry.pdf
Using the Spectrophotometer
The experiment will be conducted using the virtual spectrophotometer located in the Week 8 module titled “Spectrophotometer Lab.”
Note: You will record your data in the table following this section. The data table must be including in the ‘Results’ section of your report. All calculations carried out must be provided in report.
Absorbance Data for CoCl2
ε = molar absorption coefficient
A = maximum absorbance of known concentration solution
c = concentration of solution (given in simulation)
l = cuvette length (given in simulation)
ε = molar absorption coefficient determine from previous procedure
A = maximum absorbance of current concentration solution (not previous procedure)
l = cuvette length (given in simulation)
Notes on Real Laboratory Practices
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