Chapter 1. Chemical Reactions and Equations

12 sections · about 16 pages in the Science book (jesc101.pdf). Section anchors below are the targets of the citation chips you get back from an answer.

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Study this chapter — ask questions and take the quizGo straight to the quiz

Concept animations for this chapter

Interactive explanations, drawn in the page — no video, no external scripts. Each one is keyboard operable, has a “what to notice” caption, and a “try this” prompt that changes what it shows.

Types of chemical reactions: balance the equation and watch the atom count

conceptId: reaction-types

Mg(s) + O2(g) → MgO(s)
magnesium1oxygen1magnesium oxide1

What to notice: the two sides disagree on O — atoms are only moved around in a chemical reaction, never made or lost, so the coefficients have to be chosen to even them up.

Try this: pick Water decomposed by electricity and raise the water coefficient to 2 — the hydrogens now match but the oxygens do not until the oxygen molecule also gets a 2. Model note: only atom counts are computed here; reaction rates, energy barriers and the physical states drawn as (s)/(l)/(g)/(aq) labels are given, not simulated.

live count — not balanced: O 2=1, Mg 1=1; totals 3 = 2 atoms

10 further animations in the registries belong to other chapters.