QUIZ 3 – TAKE HOME
Chemistry I L321
DUE: Monday, December 4, 2006 in class
1. Write Lewis electron dot structures for the following molecules:
a. CCl4
b. BrCN
c. NCl3
d. PCl4+
e. CHI3
f. CH3CH2OH
2. Draw all possible resonance structures for SO2.
3. Calculate the formal charges for each atom in SCN- and for each of the three possible
structurally different Lewis structures. Which of these structures is favored and why?
4. What is the most likely Lewis dot structure for H2BF?
5. The following molecules do not obey the octet rule. Draw the Lewis electron dot
structures for each and explain how they violate the octet rule.
a. SF6
b. BF3
c. XeF2
6. Chemical and Engineering News (C&E News) is the "trade journal" published by the
American Chemical Society (ACS). The ACS consists of chemists from academia,
industry, government, and other sectors and we even have a Students' Chapter on this
campus! You can access it by going to the library webpage:
http://www.philau.edu/library/, then click on “Electronic Resources”. Under “Data
Bases”, click on Science and Health. Under “Chemistry”, click the “Search Now” under
the ACS Publications. This will take you to http://pubs.acs.org/. Click on the “ACS
Journals A-Z” option on the left of the page. Search and click on “Chemistry and
Engineering News”. You may now search back issues using a word or phrase of your
interest or just browse through issues for article titles which may be of interest to you.
The article you choose may contain terms that are unfamiliar to you. It is expected that
you will use your general chemistry text, one of the library’s searchable databases such as
Access Science, and/or another source (the only websites that are acceptable are
governmental ones at this point) to clarify their meaning. Show in your summary that
you understand the terminology used in your article. I expect that you will use and cite at
least one additional article that you found using a library database to help you interpret
your article.
Write an approximately half to one page (single spaced) summary of the article, IN
YOUR OWN WORDS. You should:
1. Succinctly summarize the article. The summary should highlight the main points
of the article. Do not use quotes from the article. Rephrase the main points in
your own words. Review the information on how to write a summary posted on
Blackboard or online at http://www.philau.edu/learning/writingasummary.htm.
2. In a separate short paragraph, discuss why (or why not perhaps) the article
interests you.
3. Use clear, concise language. Writing about chemistry requires that you be precise
in your use of language. Flowery phrases or complex analogies are neither
necessary nor acceptable.