Scoring in
Chem 119
This is a course that combines lecture and laboratory, and
the scoring reflects your performance on homework
sets, exams and in the
laboratory. Lecture and laboratory performance receive about equal weight in setting
your
grade for Chem 119.
Laboratory Reports: 180 points
Scoring of labs is based on pre-determined criteria for accuracy and
precision expected for a given experiment.
The difference between the reported result and the accepted value for
the unknown determines at least
50% of the score for each experiment. Experiments are also scored
on the reported precision when possible,
and the reported results here determine 25% of the score for those
experiments. In three experiments (#4,6,7)
graph quality also affects the score.
Proper calculation of results is important. Miscalculation
of laboratory results will be subject to a penalty of 10% of the score earned.
Punctuality
matters, too: results submitted after the due date and without an approved
excuse will be subject to
a penalty of 2
points per business day late.
Credit will not be given for
any
work submitted after 4:00 PM on 7 December.
Laboratory notebooks will be evaluated for proper recording of
experimental results, presentation of data,
calculations and results,
as well as neatness. Notebook checks will be carried out during the
weeks
of 9 Oct. and 27 Nov.
Expt. No.
|
Points Possible
|
Title of Experiment
|
1
|
20
|
The Analytical Balance
|
2
|
20
|
Calibrating Volumetric Glassware
|
3
|
20
|
Preparation of Standard Acid
and Base Titrants
|
4
|
20
|
Determination of Acid in
Vinegar Samples
|
5
|
20
|
Analysis of Solid Drain Cleaner
|
6
|
30
|
Potentiometric Analysis of a
Solid Carbonate
|
7
|
30
|
pH Titration of Ascorbic Acid in
Vitamin C
|
8
|
20
|
Mass of NaHCO3 in Alka-Seltzer Tablets
|
Notebook Checks: 20 points
Scoring reflects preparation and performance in the laboratory as
reflected by the presence of expected
information (see the Chem 119 Lab Manual, pages 6 and 7), the answers to pre-lab
assignments and the
general organization and neatness of the notebook.Two checks will be conducted
during the weeks of:
9 October 10 pts
27 November 10 pts
Lecture: 250 points
Homework
Each week, 8 problems will be assigned, from which 2 are selected and graded. Fully worked solutions (not just answers!) are due to the mailbox or office of your Laboratory TA by no later than 1200 Wednesday of the week following the assignment. Note that the homework solutions will not be graded if fewer than 4 of the 8 assigned problems are submitted or if the assignment is submitted late, without an approved excuse. Each
problem graded counts 4 points toward your homework score. Full
credit is given if a correct solution is provided and partial credit may
be assigned if warranted by the work submitted. The total number of homework
points (there are 96 possible points) is then adjusted to a maximum of 100
points by a scaling factor (100/96).
Mid-term Exams
Scoring here reflects student performance on assigned homework
sets and on two closed-book examinations covering all course
material assigned or due previous to the examination. The
exams include definitions of terms, calculations, short answer questions
and explanations of observations. General formulas, statistical and
periodic tables, and all necessary physical constants are provided
with the exam.
Partial credit is given.
The scores from the homework and the two mid-terms are averaged as
indicated below. The average is the added to the quiz score and the
score on the final exam to determine
the points earned in the Chem 119 lecture.
Quizzes
Each week, there will be a series of questions asked in lecture.
You will be expected to repond to these with your "clicker" and
your answers will be tabulated and scored. A score of 50% or higher
on these questions will earn full (50 points) credit. Scores below
50% will receive credit in proportion to the score earned. Thus, a
40% correct scores 40 points.
Final Exam
The final exam in Chem 119 is a 2-hour, "open-page" comprehensive exam
covering the lecture and laboratory work done for the course.
The date and time of this exam will be set in December by the University
Registrar. Up to date information
on dates, times and locations of F06 final exams can be found at http://www.udel.edu/exams .
Students may bring a single 8.5" x 11" page with any
information they believe can be helpful for the exam entered on both sides
of the page. On this exam, statistical
and periodic tables and all necessary physical constants are provided,
but general formulas are not. Partial credit is given. This exam is
scored from
100 points.
Scoring Summary
Laboratory reports 180
pts
Notebook checks (tentative dates)
week of 9 October
10 pts
week of 27 November 10 pts
Exams (firm dates)
Mid-term exam 4 October 100 pts
Mid-term exam 15 November 100 pts
Graded
Homework 100
pts
________________________________________________
The average of the above 3: 100
pts maximum
Quizzes and Class Questions 50
pts
Final exam xx December 100
pts
_________________________________________________
Total: 450
points maximum
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