The following sections are
Manual and Lab Rules:
Chemistry is an
experimental science and as a result, this class will incorporate
laboratory activities into the curriculum. Most of the laboratory experiments
can be found on the Chem 124 online laboratory manual.
Chem 124 Laboratory Manual
Links to the various
lab activities are also provided on the Chem 124 homepage for your section.
You will be expected
to follow the safety guidelines provided by the online laboratory manual.
In addition to the rules in the lab manual you should also wear appropriate
clothing to class on the days that we are performing a lab. Appropriate
clothing includes shirts with sleeves (meaning shoulders are covered,
no tank tops or spaghetti straps) and that completely cover one's torso
(no bare midriffs), and you should also wear closed-toed shoes with a
back (no slip-ons). If you are dressed inappropriately for lab, I will
ask you to leave to change.
notebook is your place to record your laboratory work and to make an immediate
and permanent record of your laboratory work. Your notebook must have
carbonless copies so you can remove pages easily.
your information in your notebook, use the following guidelines:
On the outside
cover, print your name. On the inside front cover, print your identifying
information (name, Chem 124 section, email address and phone number).
- Reserve the first few pages
for a Table of Contents. Depending on which lab notebook you buy, one
may be started already for you.
entries in non-erasable ink. If you make a mistake in writing a
notebook entry, draw a single line through it and write the correct
entry above it. NEVER whiteout or obliterate an entry, and never
remove a page from you notebook.
- If the pages are unnumbered,
number the right-hand pages consecutively in their upper right corners.
Format: (to be done before coming to class)
Before coming to lab, you should
prepare your laboratory notebook. We will be checking your notebook to
see that you have provided the necessary sections and are prepared to
perform the laboratory. You should prepare your notebook the night before
class as you read over the laboratory procedure. If you do your lab prep
beforehand correctly, it should take you a little while (around an hour).
You should read over the lab carefully and try to get a good idea of what
is going on while you are doing your notebook prep. The following sections
are required in your notebook BEFORE the laboratory experiment:
- Title of experiment
- Date of experiment
- Names of lab partners
- Purpose of the experiment
- just a brief (usually one or two sentences, no more than a small paragraph)
to describe the purpose of the experiment. (What is the goal of the
experiment? What are we trying to learn?) This should be written
in complete sentence form.
- Procedure - write
in your OWN words...DO NOT COPY the lab instructions or refer
to the online lab manual! The procedure should be detailed enough so
that that if the power went out in the room, you should still have enough
details to complete the experiment and others can follow your procedure.
I highly recommend using an outline form or a flow chart. The steps
can be listed as simply as "Weigh out 5.00 g of water in styrofoam
cup. Record initial temperature of water using Logger Pro."
- Data and Observations Section
- This is the most important section. Your data should be neatly organized
and presented in a correctly labeled format in your notebook. If possible,
organize your data section in tables. Note that a data table should
be titled, columns should be clearly labeled and have units, and the
correct (or requested) number of significant figures must be used. You
should have data tables already set up in your lab notebook when you
come to class that day. NEVER write data or observations on a separate
piece of paper and then recopy them into your notebook. It may not be
clear what data you will be recording, so read the lab manual carefully.
If the manual says, "Weigh an empty styrofoam cup.", then
one of your entries in the data table should be "Mass of cup".
The sections above should all
be on the carbon copy that you will turn in after completing the data
acquisition portion of the lab. I do not need to see calculations in your
notebook, but feel free to use your notebook for sample calculations.
We will be checking your carbon copies when you turn them in so please
follow the instructions above.
Failure to have the
above sections completed in your notebook ahead of time, failure to have
your notebook in class the day of an experiment, or failure to turn in
the carbon copies will result in points being deducted (up to 20%)
from the final lab report grade for the experiment.
You are to turn in typed
word document as your final lab report.
A Microsoft Word file for each experiment will be posted on the course
schedule page immediately following the experiment. You are to download
this form and fill in the appropriate spaces. The following sections usually
are included in your lab reports (unless otherwise specified):
- Calculations - You need
to show a sample calculation for each type of calculation you do for
the experiment and include each step. Data tables can and should be
used to summarize your calculations, but you will need to show how you
got all the values in that data table unless the values came directly
from the collected data. Don't forget to appropriate units and be aware
of significant figures.
- Graphs - (More information
is available on the Graphs webpage)
Most lab reports will require graphs. Each graph should be clearly and
correctly labeled. Please note the following features of a good graph:
· The title is descriptive and does not contain the word "versus".
· The axes are labeled and include the appropriate units.
· A scatter (rather than line or connect-the-dots) plot is used
and a regression line added.
· The equation and correlation coefficient for the regression
line are shown but are away from other data.
· The graph matches the data in terms of significant figures,
as does the equation used to fit the data.
Graphs should be generated
in a graphing program (like Microsoft Excel) and a printout can be pasted
into your lab notebook so that you have a copy. You will need to make
two copies of any graphs you generate - one for your original notebook
and a second to turn in with your lab report. This latter copy must be
inserted into the word document you turn in as your final report (stapling
it to the back of the report is not sufficient).
- Conclusions - A good lab
report should always include a conclusion about the results of your
experiment. Saying you enjoyed or hated the experiment is not a conclusion.
There are three key features that should appear in a conclusion:
- You should state your
final result that you were trying to determine by doing the experiment.
Summarize concisely what conclusion you can make based on your experimental
data. In some cases, you will be determining some measurement of
an unknown. In other cases, you need to make a conclusion about
a particular chemical trend or concept. If you wrote a good purpose
of the experiment, it should help to guide you as to what is an
- You should state a few short sentences about how you got that
final result, but do NOT relive the entire procedure. Just a summary
sentence or two should suffice.
- You should lastly state
any errors that could have gone wrong to give you a value different
that what is expected. If you make a technical error during the
experiment that might affect your results, this is a good place
to report that error and offer an explanation as to why your results
may not be accurate and how the error would affect your result.
Being able to analyze your mistakes is a valuable skill in problem
- Questions - For each lab,
you will be assigned questions to answer. You are encouraged to discuss
these questions with your laboratory partners, but you are to individually
answer them in your own words and to answer them in complete sentences.
Proper grammar and spelling are expected. If you have the same answer
as a classmate, you will receive a zero on the assignment.