<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
I've received several questions concerning exp 1 so I decided to
send something<br>
to everyone. I know some of you have already done exp 1 but this
should still<br>
help. There's a few things I've already e-mailed out but are
included here again.<br>
<br>
1) There was no pre-lab for exp 1. You should have read a couple of
the appendices <br>
describing the equipment (tells you how many decimal places you
should have<br>
recorded for the buret and pipets) and a change to the volumes
to use for the beaker.<br>
I did send some things earlier this week but you can find this
by going to the following<br>
link and scrolling down to exp 1.<br>
<br>
<a
href="http://chemistry.osu.edu/%7Erzellmer/chem1250/lab/lab_1250.htm"><b>Laboratory</b></a><br>
<br>
A good source for what should go in the notebook and report with
an example (manual<br>
pages, notebook example and report example) can be found at,<br>
<br>
<a href="https://uglabs.cbc.osu.edu/"><b>OSU Chemistry
Undergraduate Laboratory Server - Very useful</b></a><br>
<br>
There you will find a Chem 1250 link and once there you will
find several useful links<br>
about lab skills, lab notebook and report. I do have links to
the Notebook and Report<br>
pages at this site and my "Laboratory" link and below.<br>
<br>
2) For those of you who haven't done it yet, you should have
determined how to prepare your<br>
notebook by having looked at the instruction links on my web
page and Carmen.<br>
Take a look at the syllabus and the following link for an idea
of what should be in there,<br>
<br>
<a href="https://uglabs.cbc.osu.edu/gc-labnotebook/"><b>Chem
Lab Notebook - Departmental Guidelines for Lab Notebooks</b></a><br>
<br>
The next link shows an example I did for the first couple of
steps from the lab manual<br>
for exps 6 and 14 (also shown on the last page of the
syllabus). It shows you should<br>
write your procedure in short concise steps with only 1 or 2
objectives in each step. It<br>
looks like a "cookbook". This makes it much easier to follow
when in lab and you are<br>
less likely to make mistakes (check things off as you do them).<br>
<br>
<a
href="http://chemistry.osu.edu/%7Erzellmer/chem1250/notebook_proc_1250.pdf"><b>My
Suggestions for Writing a Notebook Procedure</b></a><br>
<br>
3) All the reports are FULL reports exp the one for exp 7.<br>
<br>
If you want to know what a FULL report is, look at the
following two links,<br>
<br>
<a href="https://uglabs.cbc.osu.edu/gc-labreport/"><b>Chem
Lab Report - Departmental Guidelines for Writing a Lab Report</b></a><br>
<br>
<a
href="http://chemistry.osu.edu/%7Erzellmer/chem1250/lab/chem1250_sample_lab_report.pdf"><b>Lab
Report Format - My Lab Report Example</b></a><br>
<br>
The 2nd one is my summary of what it should look like with
what should go into<br>
each section. It is a little more up to date in that for
most labs there are no report<br>
questions to answer in the manual.<br>
<br>
For exp 1 there are the 2 questions on page 10 you are
supposed to answer and<br>
include with the report. These can come on a page after
your conclusion.<br>
<br>
For exp 7 you will just be handing in a cover page, a graph,
some pages from the<br>
lab manual and a single sample calculation. This is
explained at the "Laboratory" link<br>
and the TA will explain it in lab at that time.<br>
<br>
a) The procedure section in the report is simply a bibliographic
reference unless<br>
you made any changes. We do NOT want any details of the
procedure in the<br>
report. Any changes you make should go in this section
below the bibliographic<br>
reference. For example, the changes to the volumes for the
beaker would be included<br>
in this section. Also, <b>for exp 1</b>, since the way you
used each type of glassware is<br>
important to the results you should have written this down
in your notebook during lab<br>
and include it in this section (i.e. did you use a 5-mL
pipet 4 times for the 20 mL or<br>
did you use a 10-mL pipet 2 times).<br>
<br>
4) Each week you must have your notebook prepared when you walk into
lab.<br>
The TA will come around the lab in the first 10 minutes or so
and check to<br>
see if you have the notebook prepared. If not, you can loose up
to 6 pts<br>
depending on how much you have done.<br>
<br>
Any data you take in lab or anything you do related to the exp
should go in<br>
the notebook. Do <b>NOT </b>write in the manual or on another
sheet of paper or<br>
anywhere else (even if you intend to copy it over to the
notebook later).<br>
You will lose points for doing so.<br>
<br>
Record values to the correct sig. fig. and include units. Use
tables when possible.<br>
<br>
Always in <b><font color="#ff0000">PEN</font></b>. If you make
a mistake put a <font color="#ff0000">single line</font> through it
and write<br>
the correct data next to it. Do <b>NOT</b> use whiteout,
scribble over the mistake<br>
or erase it.<br>
<br>
The TA will grade your notebook (worth 10 pts) and tell you how
to improve it.<br>
<br>
For exp 1, the TA will "grade" (critique) your notebook so you
have a better<br>
idea of what to do for the next exp. It's not worth any points
for exp 1. Instead<br>
those 10 pts come from the notebook exercise (as explained
below).<br>
<br>
5) Exp 1 report<br>
<br>
a) Write a full report.<br>
<br>
b) Do the <b>lab notebook exercise </b>at the following link,<br>
<br>
<a href="https://uglabs.cbc.osu.edu/1250/pre-postlabs.php"
moz-do-not-send="true"><b>Chem Lab Notebook Exercise</b></a><br>
<br>
Click on the "Postlab 1" for exp 1 at this site. Do this on
a separate sheet of<br>
paper and include it in with the report as the last page.
This will count as your<br>
10 pt notebook grade for exp 1.<br>
<br>
c) I felt the report page and graphing stuff was a little
ambiguous in what should be<br>
done so I asked the person who wrote it to make sure. Go to
the "Helpful Tidbits"<br>
link on my class web page (not Carmen) and you will find a
link for exp 1 which<br>
should help with the lab itself and the report.<br>
<br>
<a
href="http://www.chemistry.ohio-state.edu/%7Erzellmer/chem1250/faq/faq_1250.htm"><b>Helpful
Tidbits for 1250</b></a><br>
<br>
d) The graphs have little to do with the table. You will be
making 4 graphs, one for<br>
each piece of glassware using the data from the table.
That's pretty much all<br>
you need from the table for the graphs. Graph mass (y) vs.
volume (x). Make<br>
sure the graph occupies the whole piece of paper and spread
the data out (good use<br>
of the axis) so it takes up most of the space of the graph.
Don't make the labels and<br>
titles huge (14 point font for graph title, 12 point font
for axes tittles, 10 pt font for axes<br>
labels). I have examples of good graphs at the link below.
The first graph isn't the<br>
best example since it doesn't take up the full page because
I had to shrink it so I could<br>
write on it at the top and bottom. This graphs shows you
choose points from the<br>
best-fit line for use in your sample calculations for slope
(not your actual data points).<br>
The 2nd graph is a better example of what a graph should
look like. It also shows an<br>
example of when you have more than one set of data plotted.
In that case you need<br>
a legend and you can bring the legend inside the graph area
to allow the graph to<br>
spread out and occupy the whole page. You don't need a
legend when there's only<br>
one set of data plotted (as for each graph in exp 1) since
your title should indicate what's<br>
being plotted. You do NOT need grid lines for most of the
graphs this semester (except<br>
for exp 6 graphs). Also, Excel's default orientation is
Landscape and that generally is<br>
the best for graphs. For exp 6 you'll see that Portrait
mode is the proper orientation.<br>
<br>
<a
href="http://chemistry.osu.edu/%7Erzellmer/sample_graphs.pdf"><b>Sample
Graphs</b></a><br>
<br>
There's also a link you can use to help get you started with
Excel if you've never<br>
used it before. It's a simple example for a density graph.
This is similar to what you<br>
are doing in exp 1 but not exactly the same. Go to the
following link and you will find<br>
this, along with other useful links.<br>
<br>
<a
href="http://chemistry.osu.edu/%7Erzellmer/excel/excel.htm"><b>Using
MS Excel for Reports</b></a><br>
<br>
Many of my examples use an older version of Excel (Excel
2003). I have a link<br>
explaining the major differences between it and the newer
versions. Again, click tabs,<br>
right-click, etc. and explore what it can do and where to
find things. There are Excel<br>
tutorials and videos all over the web (YouTube, Microsoft's
web site). If you aren't<br>
sure about how to do something after looking for help please
ask me.<br>
<br>
e) You should discuss the graphs in the Discussion section.
What is the density from the<br>
graph and how does it compare to the average from the
table? What do they indicate<br>
about determinate and indeterminate error? What should the
intercept be and why might<br>
your intercept not agree? Turn in all 4 graphs. Remember,
1 graph per page.<br>
Include the report questions 1 and 2 (on a separate sheet of
paper) in your report.<br>
You should also be discussing the results in your table.
How do they compare to the<br>
results from the graphs?<br>
<br>
f) At a minimum, make sure you cover all the points to consider
(found on p. 10).<br>
<br>
1) For the first one, when you are discussing precision
think in terms of the uncertainty<br>
of the particular piece of glassware. Since you didn't
do repeated measurements<br>
of a single volume it's tough to address your
precision. Think about how the % errors<br>
for density agree for each separate piece of glassware
and what on the graph gives you<br>
an idea about precision (it may actually be easier to
answer this by looking at the graphs).<br>
See my help file on line.<br>
<br>
I'm will be sending a follow-up e-mail with a few more specifics
about exp 1 data and graphs.<br>
<br>
I hope this and my on-line help file address the majority of your
questions. If not ask.<br>
<br>
Dr. Zellmer
</body>
</html>