ChainReaction: Chem 100

About this app

Chain Reaction is a full general-chemistry course and a fast arcade quiz in one app. Read the chapter, then race the clock on what you just read. A COMPLETE WRITTEN COURSE Twenty-one chapters, one per topic, covering the whole Chem 1A + 1B sequence from measurement through organic chemistry. These are not flashcard summaries. The course runs to roughly 143,000 words — about twelve hours of reading — with 213 worked examples that carry real numbers all the way to an answer, and 152 reference tables holding the material chemistry actually requires you to have in front of you: the polyatomic ions, the solubility rules, the strong acids and bases, standard reduction potentials, VSEPR geometries, the functional groups, the decay modes. EVERY NUMBER CHECKED Each worked example was computed and then independently recomputed. Every reference table was verified against standard tabulated values — every Ksp exponent, every formation constant, every half-life, every standard potential. READ A CHAPTER, THEN DRILL IT Every chapter ends with a button that starts a timed run using only that chapter's questions. Chapter practice never touches your Quick Play high score, so you can hammer a weak topic without spoiling a good run. BEAT THE CLOCK Quick Play is an endless blitz across all 21 topics: three lives, rising levels, and a combo multiplier that rewards streaks. Every question is timed, and every miss is followed by the correct answer and a short explanation, so getting one wrong still teaches you something. TWO HUNDRED AND SEVENTY-FOUR QUESTIONS Twelve to fourteen per topic, mixing recall, concept, calculation, trend-reading and spot-the-error. Answer choices reshuffle every time, so nothing can be memorized by position. Wrong answers are built from the mistakes students actually make — the dropped coefficient, the un-converted unit, the reciprocal, the unsquared concentration, pH confused with pOH. TWENTY-ONE TOPICS Measurement · Atoms & Ions · Electrons & Orbitals · Periodic Trends · Bonding · Lewis Structures & VSEPR · Nomenclature · The Mole & Stoichiometry · Reactions & Equations · Aqueous Solutions · Gases · Thermochemistry · Kinetics · Equilibrium · Acids, Bases & Buffers · Intermolecular Forces & States · Thermodynamics · Electrochemistry · Solubility Equilibria · Nuclear Chemistry · Organic & Biomolecules WRITTEN FOR MED AND PRE-MED Every chapter carries a clinical-relevance note — 78 in all. Blood buffering and acid-base disorders, drug ionization and absorption, the Nernst equation behind a resting membrane potential, radioisotopes in imaging, why ice floats and what that has to do with a cell. The chemistry is standard; the examples are the ones a health-science student meets again later. BUILT TO STAY OUT OF YOUR WAY No account. No sign-in. No advertising. No analytics and no tracking of any kind. Everything works offline, and your score stays on your device. Chain Reaction is an independent study aid from BlackFox Media LLC. It is a study aid for educational use and is not medical advice.

LEARN IS NOW A REAL COURSE. The Learn section used to be a short outline — about 250 words per chapter. It has been rewritten as twenty-one full chapters totalling roughly 143,000 words, twenty-three to forty-four minutes of reading each. - Chapters now teach the material instead of listing it: 213 worked examples carried to a real answer, and 152 reference tables covering the polyatomic ions, solubility rules, strong acids and bases, standard reduction potentials, VSEPR geometries, thermodynamic sign cases, functional groups and decay modes. - Every calculation was computed and independently recomputed. Every tabulated constant — Ksp values, formation constants, half-lives, standard potentials — was checked against standard references. DRILL THE CHAPTER YOU JUST READ Each chapter now ends with a button that starts a timed run drawn only from that chapter's topic. It reports how many questions back the chapter before you start, and it deliberately does not overwrite your Quick Play high score. THE QUESTION BANK GREW FROM 64 TO 274 Twelve to fourteen questions per topic instead of three. Every question is answerable from its own chapter, and the wrong answers are built from real student errors rather than filler. NO MORE ADVERTISING The ad banner is gone. This version contains no advertising SDK, no analytics and no tracking of any kind, and it makes no network requests at all. BETTER ON iPAD The reading column is now capped and centered instead of stretching the full width of the display, so chapter text stays at a comfortable line length on a 13-inch screen. The home screen is centered to match. ALSO IN THIS RELEASE - A new reference-table layout in the reading view for material that belongs in a table - Fixed the Measurement chapter rendering in the wrong accent color - About now carries the full Limitation of Liability, Release of Claims, Governing Law, Changes and Trademarks sections

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1. First observed Sep 29, 2026 · 7:54 AM $0.99