Chemistry Class Notes (Transcript-based)

Instructor welcomes interaction and emphasizes collaboration; this is all reflected in the syllabus and class norms.
Preference: let students review recorded lectures and learn on their own, then use in-class time to discuss fine points and clear up confusion.
The default in class is the instructor talking while students take notes, especially in a large lecture hall; students are encouraged to steer the session if they want a different approach.
Class size: roughly $93$ students; group work and flexible teaching methods are harder to implement in this setting, so the instructor uses traditional lecture by default but invites student input to change the format.
The instructor values student life and is sensitive to makeup exams, aiming to minimize endless makeup opportunities due to scheduling conflicts.

The course covers $10$ chapters this semester.
There will be a couple of in-person midterm exams and a cumulative final exam.
After today, there are three dates when you need to be in class to take written tests: one in September, one in November, and the final is cumulative (with heavier emphasis on the last two chapters).
Each midterm will cover $4$ chapters.
The final exam is cumulative but will heavily focus on the last two chapters studied.
Assessments (midterms and final) are multiple-choice bubble-sheet exams.

Recommended textbook: Brown, LeMay, 14th edition. A shareable link is provided that does not require login; you can access it without logging in, though some steps may require AppState email authentication for videos.
The linked page maps which chapter in the Brown and LeMay text corresponds to which pages in the alternative textbook edition used in class, helping with cross-reference.
Chapters may be reorganized between editions, so use the chapter-page mapping to locate the same content across editions.
There are worked examples with explanations in the files accompanying the chapters, plus recorded videos that require logging in with your AppState email account to access.
At the start of each chapter, you’ll find a module with open homework for that chapter.

Homework for each chapter is opened as the chapter begins and is due at the end of that chapter.
Quizzes open on a schedule (e.g., “open next Tuesday morning”) and will have a due date associated with the chapter timelines; exact dates are posted in the course schedule.
All exams are multiple-choice bubble sheets; makeup exams are discouraged but accommodated when feasible—no endless makeup options. The instructor emphasizes practicality and respect for students’ lives outside class.

Atoms and molecules are the foundational building blocks of matter.
An atom is the smallest unit of an element with its own unique properties; elements are the individual Lego-like building blocks.
Elements cannot be transformed into different elements by simple means (in the context of chemistry). They retain their identity as unique building blocks.
Molecules are groups of atoms bonded together; compounds are substances made from two or more different elements chemically bound.
A key question in chemistry: how do we rearrange these building blocks (atoms) to form new substances via chemical reactions?
In contrast, physics deals with deeper structural questions about what makes atoms themselves; chemistry focuses on the rearrangement of atoms into new substances.

Matter can be classified into solid, liquid, and gas; plasma is another state of matter.
There are many solid phases; substances can exist in different states (e.g., water as solid ice, liquid water, and gaseous steam).
A mixture is a combination of two or more substances where each substance retains its own properties (e.g., water staying wet and sugar staying sweet).
A pure substance is a single substance with a fixed composition; within pure substances, the sample is uniform in composition and properties.
Glucose mixed with glucose remains a pure substance (same composition throughout); when different substances are combined, you can have a mixture or a compound depending on whether they are chemically bound.

Atoms are like Lego blocks: single, indivisible units with distinct properties.
You can click Lego blocks together in infinitely many patterns to form molecules and, in turn, compounds with varied properties.
The identity of a Lego block (an element) is fixed; you cannot cut a block in half to change its properties in ordinary chemistry—this retains the element’s identity.
Combining blocks into different shapes corresponds to chemical reactions and the formation of new substances with new properties.
Physics would get into how atoms themselves are built and manipulated at a deeper level; chemistry operates at a level where we rearrange already-defined blocks.

Pure substances: fixed composition; examples include elemental elements and compounds.
Compounds: substances formed from two or more different elements chemically bonded.
Mixtures: combinations of substances that retain their own identities and properties.
Chemical reactions: processes that rearrange atoms and bonds to form new substances with different properties.

Significant figures: there is meaning in how many digits a number has and where the decimal point sits. The difference between writing numbers as $1$ , $1.0$ , and $1.00$ is not trivial in measurements and reporting.
The rules for significant figures can be confusing, but they matter for measurement precision and later chemistry topics; expect a quick review next class.

Chemistry explains why materials behave the way they do, from everyday substances to minerals and biological materials.
The course links to foundational science—how atoms come together to create everything around us—and to practical applications like material properties, chemical reactions, and industrial processes.
The Lego analogy helps bridge intuitive understanding of building blocks to real chemical bonds and reactions.

Be prepared to engage with recordings, homework, and in-class discussions; the instructor aims to minimize purely passive lectures and maximize meaningful, guided learning outside class time.
Given the large class size, students should actively participate, steer discussions if they want a different pace or method, and manage study time around the chapter-based schedule.
Plan ahead for exams and quizzes; keep track of three in-class exam dates and the cumulative final; use the textbook and course resources to study before each assessment.

Review the chapter-by-chapter structure and map it to the two textbooks as needed using the provided cross-reference page.
Regularly consult the recorded videos (login required) to reinforce in-class topics.
Practice significant figures and measurement concepts ahead of the next class to build a solid foundation for numerical reasoning in chemistry.
Use the Lego-block metaphor to explain concepts to peers and to yourself when studying new material.
Stay organized with the chapter-based homework and note the exam dates to avoid last-minute stress.