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This textbook was created for the CHEMI: 1105 Contemporary Chemistry course at the College of DuPage with funding from the OER Faculty Support Grant Program. Copyright © Lubna Haque, Kathleen M. Hess, Usha I. Narayanan, and Andy Sua 2026. This work is licensed under a Creative Commons Attribution-Non-Commercial-ShareAlike 4.0 (CC BY-NC-SA 4.0) License, except where otherwise noted. Content for this textbook was adapted from the following open educational resources: Chemistry for Changing Times (Hill and McCreary) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. The Basics of General, Organic, and Biological Chemistry (Ball et al.) is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by LibreTexts. Chapter 7: Chemical Reactions was taken from the CHEMI 1105 OER lab manual, which is written by College of DuPage professors with several updates and additions. This material is also shared under a CC BY-NC-SA 4.0 license.