[cbc-chem1210] exp 1 report, graphing, report questions, notebook exercise, etc.
robert zellmer
zellmer.1 at osu.edu
Sat Jan 17 06:38:12 EST 2015
I've received several questions concerning exp 1 so I decided to send
something
to everyone.
1) There was no pre-lab for exp 1. You should have read a couple of
the appendices
describing the equipment (tells you how many decimal places you
should have
recorded for the buret and pipets) and a change to the volumes to
use for the beaker.
I did send some things earlier this week but you can find this by
going to the following
link and scrolling down to exp 1.
*Laboratory*
<http://chemistry.osu.edu/%7Erzellmer/chem1210/lab/lab_1210.htm>
2) For those of you who haven't done it yet, you should have your
notebook prepared.
Take a look at the syllabus and the following link for an idea of
what should be in there,
*Chem Lab Notebook Exercise - Guidelines for Lab Notebooks*
<http://undergrad-ed.chemistry.ohio-state.edu/labnotebook/index.html>
The next link shows an example I did for the first 2 steps from the
lab manual for exp 14.
While you don't do exp 14 in 1210 it shows you should write your
procedure in short
concise steps with only 1 or 2 objectives in each step (like a
cookbook). This makes it
much easier to follow when in lab and you are less likely to make
mistakes (check things
off as you do them).
*My Suggestions for Writing a Notebook Procedure*
<http://chemistry.osu.edu/%7Erzellmer/chem1210/lab/notebook_proc_1210.pdf>
3) Exp 1 is a FULL report. All the reports are FULL reports exp the
one for exp 7.
If you want to know what a FULL report is look at the following two
links,
*Chem Lab Report Exercise - Guidelines for Writing a Lab Report*
<http://undergrad-ed.chemistry.ohio-state.edu/labreports/index.html>
*Lab Report Format - My Lab Report Example*
<http://chemistry.osu.edu/%7Erzellmer/chem1210/lab/chem1210_sample_lab_report.pdf>
The 2nd one is my example of what it should look like with what
should go into
each section. It is a little more up to date in that for most
labs there are no report
questions to answer in the manual. For exp 1 there are the 5
questions on page 10
you are supposed to answer and include with the report (some
will be answered
as part of the Discussion section - see rubric).
For exp 7 you will just be handing in a graph and some pages
from the lab manual.
This is explained at the "Laboratory" link and the TA will
explain it in lab at that time.
a) The procedure section in the report is simply a bibliographic
reference unless
you made any changes. We do NOT want any details of the
procedure in the
report. Any changes you make should go in this section below
the bibliographic
reference. For example, the changes to the volumes for the
beaker would be included
in this section. Also for exp 1, since the way you used each
type of glassware is
important to the results you should have written this down in
your notebook during lab
and include it in this section. The same for the balance, did
you used the
analytical or the top-loading balance?
4) Each week you must have your notebook prepared when you walk into lab.
The TA will come around the lab in the first 10 minutes or so and
check to
see if you have the notebook prepared. If not, you can loose up to
56pts
depending on how much you have done.
Any data you take in lab or anything you do related to the exp
should go in
the notebook. Do NOT write in the manual or on another sheet of paper
(even if you intend to copy it over to the notebook later).
Record values to the correct sig. fig. and include units. Use
tables when possible.
Always in PEN (report too). If you make a mistake put a single
line through it and
write the correct data next to it. Do NOT use whiteout, scribble
over the mistake
or erase it.
The TA will grade your notebook (worth 10 pts) and tell you how to
improve it.
For exp 1 the TA's will "grade" (critique) your notebook so you
have a better
idea of what to do for the next exp.
5) Exp 1 report
a) Write a full report.
b) Do the lab notebook exercise at the following link,
*Chem Lab Notebook Exercise - Guidelines for Lab Notebooks*
<http://undergrad-ed.chemistry.ohio-state.edu/labnotebook/index.html>
The exercise is toward the bottom of the page (about halfway
down). Do this
on a separate sheet of paper and hand it in with the report in
the next lab period.
This will count as your notebook grade for exp 1.
c) I felt the report page and graphing stuff was a little ambiguous
in what should be
done so I asked the person who wrote it to make sure. Go to
the "Helpful Tidbits"
link on my class web page (not Carmen) and you will find a link
for exp 1 which
should help with the lab itself and the report.
*Helpful Tidbits for 1250*
<http://www.chemistry.ohio-state.edu/%7Erzellmer/chem1250/faq/faq_1250.htm>
d) The graphs have little to do with the table. You will be
making 4 graphs, one for
each piece of volumetric glassware using the data from the
table. That's pretty
much all you need from the table for the graphs. Graph mass
(y) vs. volume (x).
Make sure you use the whole piece of paper and spread the data
out (good use
of the axis) so it takes up most of the space of the graph.
Don't make the labels and
titles huge (use 10 or 12 point font). Everyone should receive
examples of good
graphs in lab. In case you don't you can find them at the link
below. Even the one
graph doesn't take up the full page since I had to shrink it so
I could write on it at
the top and bottom. This graphs shows you choose points from
the best-fit line for
using in your sample calculations for slope (not your actual
data points). The 2nd
graph is a better example of what a graph should look like. It
also shows an example
when you have more than one set of data plotted. You can bring
the legend inside
the graph area to allow the graph to spread out and occupy the
whole page. You
don't need a legend when there's only one set of data plotted
(as for each graph in
exp 1). You do NOT need grid lines for most of the graphs this
semester (you will
for exp 6 graphs).
*Sample Graphs* <http://chemistry.osu.edu/%7Erzellmer/sample_graphs.pdf>
There's also a link you can use to help get you started with
Excel if you've never
used it before. It's a simple example for a density graph.
This is similar to what you
are doing in exp 1 but not exactly the same. Go to the
following link and you will find
this, along with other useful links.
*Using MS Excel for Reports*
<http://chemistry.osu.edu/%7Erzellmer/excel/excel.htm>
Many of my examples use an older version of Excel (Excel
2003). I have a link
explaining the major differences between it and the newer
versions. Again, click tabs,
right-click, etc. and explore what it can do and where to find
things. There are Excel
tutorials and videos all over the web (YouTube). If you aren't
sure about how to do
something after looking for help please ask me.
e) You will use the graphs to answer report questions 1, 2 and 3
on page 9 in the manual
(in the Discussion section). Turn in all 4 graphs. Remember, 1
graph per page.
Turn in report questions 4 and 5 (on a separate sheet of paper
or part of the Discussion
section) with your report.
1) For question 1 when you are discussing precision think in
terms of the uncertainty
of the particular piece of glassware. Since you didn't do
repeated measurements
of a single volume it's tough to address your precision.
Think about how the % errors
agree for each separate piece of glassware and what on the
graph gives you an
idea about precision (it may actually be easier to answer
this by looking at the graphs).
See my help file on line.
I'm will be sending a follow-up e-mail with a few more specifics about
exp 1 data and graphs.
I hope this and my on-line help file address the majority of your
questions. If not ask.
Dr. Zellmer
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