Review of Lectures 10 to 17 AOSC - CHEM 433 & AOSC - CHEM 633 - Second Exam Review

Sep 25, 2026

Online, open-book/open-web second exam guidance and lecture review spanning Lectures 10–17 for AOSC/CHEM 433 and AOSC/CHEM 633. The review emphasizes time-limited qualitative question answering, minimal calculations, and preparation strategy based on complete readings, AT responses, and learning outcome quiz retention. Supporting lecture topics include ozone formation chemistry via radicals, solar UV photodissociation and initiation–propagation–termination pathways, and atmospheric absorption/black-body spectral considerations relevant to photolysis and electronic-state transitions.

LanguageEnglish

CategoryExam

FormatPDF

Pages64

Reading Time2 h 41 min

AccessFree to download

Announcements

Second Exam Format and Preparation Guidance

Weekly Seminar (12 Nov 2020)

Summertime Ozone in North America

Lecture Review Themes (Lectures 10–17)

Radical Chemistry and Ozone Formation

Solar Irradiance, Black-Body Spectra, and Atmospheric Absorption

UV Absorption and Photodissociation Mechanisms

Review of Lectures 10 to 17 AOSC / CHEM 433 & AOSC / CHEM 633 Ross Salawitch Class Web Sites: [http://www2.atmos.umd.edu/~rjs/class/fall2020](http://www2.atmos.umd.edu/~rjs/class/fall2020) [https://myelms.umd.edu/courses/1291919](https://myelms.umd.edu/courses/1291919) [https://www.videoblocks.com/video/earth-sunset-spacewalk-view-from-space-station-r7dydlcsgjd23vml0](https://www.videoblocks.com/video/earth-sunset-spacewalk-view-from-space-station-r7dydlcsgjd23vml0) 12 November 2020 Copyright © 2020 University of Maryland. This material may not be reproduced or redistributed, in whole or in part, without written permission from Ross Salawitch. 1 Announcements: Class Second Exam Second exam which will be on-line, open book, open web, that everyone will take during normal class hour on Tues, 17 Nov, from 2:02 to 3:17 pm. However, please note that: a) the exam will focus on a series of question that you can only answer properly in the limited time IF you are already familiar with the contents of each lecture; b) there will be either minimal or no calculations on the exam, the vast majority of the exam will be qualitative rather than quantitative c) if you have been doing all of the readings, answering the ATs based on a comprehensive understanding of the readings, and retaining knowledge from the readings and exams, as solidified by consistently high scores of the learning out come quizzes, then you'll be in great shape for the first exam. On the other hand, if you have been skimming the readings, doing the bare minimum to answer the ATs, and not completing the learning outcome quizzes, you will need to impart greater effort to prepare for the exam, in order to do well. d) by “open web”, I mean you are allowed to search for information on the Web. You absolutely, positively are not allowed to conduct any on-line chats, or solicit help from an on-line assistance program of any sort. Today, 12 Nov: AOSC Weekly Seminar (3:30 pm) Dr. Dylan Jones, University of Toronto Summertime ozone in North America: Isolating weather-driven ozone pollution events and evaluating trends in precursor emissions Air pollution regulations have led to dramatic reductions in emissions of air quality pollutants in North America, and thus improvements in air quality, during the past three decades. However, ozone pollution episodes remain an issue in some regions of North America. Furthermore, there are uncertainties in the trend in emissions of nitrogen oxides (NOx), a key ozone precursor. In this talk I will examine the link between summertime ozone pollution episodes and large-scale atmospheric circulation patterns and present an analysis isolating the weather-driven component of ozone pollution episodes. I will also review the discrepancies in recent trends of emissions of NOx in the United States and discuss the use of a deep learning model to evaluate the consistency of the reported trends in NOx emissions with observations of surface ozone. [https://aosc.umd.edu/seminars/department-seminar](https://aosc.umd.edu/seminars/department-seminar) Email [Joseph Knisely at](Joseph Knisely at jknisely@umd.edu)[ j](Joseph Knisely at jknisely@umd.edu)[knisely@umd.edu](Joseph Knisely at jknisely@umd.edu) for Zoom connection info Copyright © 2020 University of Maryland. This material may not be reproduced or redistributed, in whole or in part, without written permission from Ross Salawitch. 3 ATL2428 here Copyright © 2020 University of Maryland. This material may not be reproduced or redistributed, in whole or in part, without written permission from Ross Salawitch. 4 • With a few exceptions, the only reactions between molecules that proceed at appreciable rates are those involving at least one radical • Radicals require significant energy to form: a bond must be broken • Radical formation is tied to absorption of photons that “photodissociate”a compound, leading to radical formation Initiation O2 +

FAQs

When and how will the second exam be conducted?

The second exam will be online, open book, and open web during the normal class hour on Tuesday, 17 Nov, from 2:02 to 3:17 pm.

What should students focus on for success on the exam?

The exam emphasizes qualitative questions that require familiarity with each lecture’s content. Minimal calculations are expected, and good preparation depends on completing readings, answering ATs thoroughly, and doing the learning outcome quizzes well.

What does “open web” allow and what is prohibited?

“Open web” allows searching for information on the Web, but students are not allowed to conduct any online chats or seek help from online assistance programs.

Sep 25, 2026

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