WSU-Spring 2006; Principles of Organic Chemistry
II Laboratory; Chemistry 351
Guidelines for Lab Reports
Learning how to effectively report experimental results is
extremely important in all of the sciences. Although the customary format may vary between discipline,
a scientific report should be clear, concise, and well organized and
should make effective use of tables and graphs. Also, in keeping with the need
for objectivity in scientific experimentation, scientific reports should be
written in an impersonal, matter of fact style.
General Guidelines
- The report should be
thorough, well written, and well organized.
- Reports should be word-processed and double-spaced.
- Do not ignore the need for subscripts and superscripts in
chemical formulas. These are easily available in all modern word processors.
- If it is not feasible for you to word-process your lab reports then
neatly hand-written (in ink) reports will be accepted but this will cost you a
penalty of 5 points.
- Bonus points will be awarded to reports that use molecule
drawing software to present professional-looking rather than hand-drawn
reaction graphics.
Title Page
- Give the number and title of the experiment,
your name, course number and section, and the date submitted on this page.
Results and Discussion Section -
In this section you should present the results of the
experiment in a concise and efficient manner.
Results Tables.
- Present all of the results of the experiment in table form.
- Each table should be numbered and titled.
- Try to keep the results table(s) limited to a single page.
One large table that presents all of the results is preferable to several
smaller ones.
-
Make sure to give units where required. (A well-organized table gives the units
in the column headings rather than repeatedly throughout the table.)
- Make sure to observe the significant figures
convention.
- Always include the absolute and percent yields of any products
obtained.
- Always include the experimental vs literature values for any physical constants
measured.
- The results tables should also include a summary (i.e., a
peak listing) of any spectroscopic data (NMR, IR, MS)
obtained. Literature data for the spectra should also be presented if available.
Discussion
- Immediately after the
results table(s) you should discuss the results briefly in a non-interpretative way.
Point out the most important take-home points from the table(s) and/or any
trends you would like to draw attention to.
Answers to
Assigned Questions
- Make sure to explain all
answers completely - even if the question does not ask for an explanation.
-
Answer using complete sentences - one or two word answers will not suffice.
- Pay
attention to spelling and grammar when answering the questions.
- Above all, make sure your answer is correct. Do not just
take a stab at it! If uncertain, do some Internet and/or Library research or
ask the instructor if you are on the right track.
Conclusions Section - In
this section you should interpret the results of the
experiment and state the conclusions to be reached.
- Start with a discussion of
theory (give the mechanism of the reaction and equations for any expected side
reactions).
- Then discuss how the results of the experiment support the theory.
For preparative
experiments (Expts 4-9) the following points should be addressed.
- Actual yield of product
versus the theoretical yield (percent yields) and list some possible reasons for
loss of yield.
- Evidence for the structure of the product
from NMR, IR and/or chemical tests.
- Purity of the product as indicated
by mp, bp, NMR, etc.
- Provide explanations for unanticipated results
- Feel free to make suggestions as to how the experiment could have been better
designed or carried out.
References
- Give a complete list of the references you used to prepare
the report. Sources of all literature values and/or spectra need especially
be provided.
Supplemental Information and Materials:
Attachments
- Calculations sheet. Include a sheet showing all calculations,
especially theoretical and % yield calculations. Do not include trivial calculations such as
subtraction of tare weights. The calculations sheet can be hand written.
- Printouts of all spectra obtained. Make
sure the spectra are completely labeled (name, date section number, expt number
and title). All peaks should be labeled.
Products - Do not throw away the products from your
reactions! They must be submitted for grading and proper disposal by the
instructor.
- Solid products should be placed in completely labeled (compound name
and structure, your name, expt #, course # and section) small 2"x2"
zip-lock baggies and attached to the front of the report.
- Liquid products should be placed in completely labeled (compound name
and structure, your name, expt #, course # and section) screw-top vial and
turned into the TA during the lab period.
- Do not bring products to Dr. Nalli's office!
Team Contribution Forms (TCFs)
- These are handed in individually and collected separately
from the reports. Do not assemble your group's TCFs and staple to the
report.