# General chemistry: connect particles, equations and quantities — Study worksheet [Study guides](https://unireadinglist.com/guides/general-chemistry/) [Course topic: General Chemistry](https://unireadinglist.com/subjects/chemistry/#course-general-chemistry) Sources checked: 2026-11-03 Study route and exercise: University Reading List editorial project. A first pass through general chemistry, from measurement to equilibrium, using Chemistry 2e (2019), The Central Science 15e (released 2022, copyright 2023), and the MSU Libraries CLUE edition (2020). The six stages are study units, not a promise to finish two semesters in six weeks. This is a reading and paper-calculation route, not laboratory training. ## Choose your starting point - [ ] I need a free course spine Start with Chemistry 2e. Its worked examples and selected student answers allow a repeatable attempt–check–explain cycle. Keep a dated error log and use CLUE only when the particle explanation remains unclear. - [ ] My course assigns Brown and colleagues Use the exact 15e syllabus chapters and assignment package. Match concepts to OpenStax by title rather than chapter number: kinetics is Brown 14 but OpenStax 12. A print ISBN does not establish Mastering access. - [ ] I can calculate but cannot explain Read CLUE alongside short numerical sets from OpenStax. Before calculating, predict which species change and why. This combination addresses explanations; it does not replace the breadth of a conventional course problem bank. ## Compare the three books ### Chemistry 2e Paul Flowers; Klaus Theopold; Richard Langley; William R. Robinson · 2 · 2019 Free practice spine Choose it when: You want conventional coverage with an official web/PDF route and worked numerical examples. Use another route when: You expect a complete public solution for every exercise or an assessed practical course. Selected reading: Begin with chapters 1–4; return to chapters 6–7 for atoms and bonding. Limits and trade-offs: The long survey requires selection. Odd-numbered exercise answers are available to students; even-numbered instructor answers are not a self-study entitlement. #### Try before choosing After OpenStax sections 4.3–4.4, explain why fewer starting moles need not identify the limiting reagent, using the invented reaction in this guide. Check your work: Compare n/coefficient for both reagents before choosing the minimum; then check residual atoms. A correct product number without this argument leaves the conceptual gap unresolved. Your notes: ________________________________ ISBN: 9781947172623 [Official free reading](https://openstax.org/details/books/chemistry-2e) [Book record and access options](https://unireadinglist.com/subjects/chemistry/chemistry-2e/) ### Chemistry: The Central Science Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus · 15 · 2022 Syllabus and exercise reference Choose it when: Your class already uses 15e, or you need its sequence of topics and problem practice. Use another route when: You only need a free first route or cannot establish the required digital-access arrangement. Selected reading: Use chapters 1–4, 8–9 and 14–17 selectively; the chapter map differs from OpenStax. Limits and trade-offs: The catalog print identifier is 9780137493609. Pearson lists separate eText and Mastering products, so compare the assigned format before acquiring access. #### Try before choosing Use an available 15e contents/sample or legitimate copy to cross-reference stoichiometry chapter 3 with bonding chapters 8–9. Write a particle explanation and a mole calculation for the same invented formula. Check your work: Keep atom identity, formula subscripts and reaction coefficients distinct. If your assignment names a 15e question, verify its format and location rather than assuming OpenStax numbering matches. Your notes: ________________________________ ISBN: 9780137493609 [Book record and access options](https://unireadinglist.com/subjects/chemistry/chemistry-the-central-science/) ### CLUE: Chemistry, Life, the Universe and Everything Melanie M. Cooper; Michael W. Klymkowsky · 2020 Conceptual repair companion Choose it when: You want an explanation linking structure, interactions, systems and energy. Use another route when: You need it alone to supply every routine calculation demanded by a standard general-chemistry syllabus. Selected reading: Use the 2020 MSU edition: atoms and systems thinking are useful anchors for explanation notes. Limits and trade-offs: Its connected conceptual route is valuable when you write predictions and diagrams; adding it as another passive reading assignment increases workload without diagnosing mistakes. #### Try before choosing Use CLUE’s atoms/systems orientation to draw an energy-system boundary and write separate predictions about energy change and reaction speed, without inventing a numerical rate. Check your work: A thermodynamic tendency alone does not supply a kinetic rate. If the diagram diagnoses your difficulty but routine stoichiometry remains weak, pair this conceptual companion with the practice spine. Your notes: ________________________________ ISBN: 9781626101012 [Official free reading](https://openbooks.lib.msu.edu/clue/) [Book record and access options](https://unireadinglist.com/subjects/chemistry/clue-cooper-klymkowsky/) ## Check your preparation ### What mathematics should I check first? Your notes: ________________________________ ### Do I need prior chemistry or a lab? Your notes: ________________________________ ### How do I know that I understood a worked example? Your notes: ________________________________ ## Six steps with a concrete output - [ ] 1. Establish measurement discipline Selected reading: Chemistry 2e, chapter 1, especially dimensional analysis and measurement uncertainty. Make this: Create a conversion chain for mass and volume, then annotate one rounded result with the precision justified by its inputs. Check your work: Every cancelled unit is visible; you distinguish a measured value from an exact stoichiometric coefficient. Your notes: ________________________________ - [ ] 2. Connect formulas to amounts Selected reading: Chemistry 2e, chapters 2–3: formulas, the mole and solution concentration. Make this: For an invented compound, translate a particle ratio into a formula and convert a chosen amount between mol and mass using stated molar masses. Check your work: You can explain why a subscript changes identity while a coefficient changes the amount of a species. Your notes: ________________________________ - [ ] 3. Account for a reaction Selected reading: Chemistry 2e, chapter 4, especially 4.4; compare Central Science 15e chapter 3 if assigned. Make this: Complete the limiting-reactant example below without viewing the answer. Add a before/after amount table and identify the excess reagent. Check your work: Both elements balance, unused reagent is nonnegative, and the product cannot exceed either independent reagent bound. Your notes: ________________________________ - [ ] 4. Explain bonding rather than memorise shapes Selected reading: Chemistry 2e, chapters 6–7; optional Central Science 15e chapters 8–9 and CLUE atoms/bonding discussion. Make this: Draw two different small molecules, count valence electrons, label a plausible geometry and distinguish bond polarity from molecular polarity. Check your work: Your explanation names the model used and does not treat a Lewis diagram as a literal photograph of electrons. Your notes: ________________________________ - [ ] 5. Separate energy from speed Selected reading: Chemistry 2e, chapters 5 and 12; optional CLUE systems thinking, chapter 5. Make this: Draw an invented reaction energy profile with and without a catalyst, holding reactant and product energies fixed. Identify the system boundary for a heat statement. Check your work: A lower activation barrier changes rate; it does not by itself change the reaction enthalpy or equilibrium constant at the same temperature. Your notes: ________________________________ - [ ] 6. Test equilibrium claims Selected reading: Chemistry 2e, chapter 13 and selected chapter 14 acid–base sections; Brown 15e chapters 15–16 provide an alternate reference. Make this: For a simple stated equilibrium, write Q, compare it with a supplied K, predict the initial net direction, and explain what concentration data would be needed for a numerical final state. Check your work: You separate direction, rate and final composition, and explicitly name any concentration or temperature assumptions. Your notes: ________________________________ ## Worked exercise: A fictional reaction with a leftover reagent For the hypothetical reaction A₂ + 3B₂ → 2AB₃, initial amounts are 0.080 mol A₂ and 0.180 mol B₂. Molar masses are A = 10.0 g/mol and B = 5.0 g/mol. Find the maximum product amount and mass, the leftover reagent, and the percentage yield if the stated product amount is 4.80 g. Assumptions: This is an invented paper model, not a proposed synthesis. Assume complete conversion of the limiting reagent, no side reactions, pure product, and the stated molar masses. The 4.80 g result is fictional. Retain extra digits until reporting. Your notes: ________________________________ ## Change an assumption: Follow-up: purity and recovery are different questions Retain the original starting amounts and molar masses, so the theoretical AB₃ maximum remains 3.00 g. Replace the pure-product assumption: the recovered 4.80 g sample is stipulated to contain 50.0% AB₃ by mass. Outside contamination may enter during collection; no source is identified. Find recovered AB₃ yield and decide whether reagent conversion is known. Your notes: ________________________________ ## Before moving on - Produce a reaction account containing a balanced equation, limiting-reagent calculation, leftover amount, unit checks and an atom or mass balance. - Write two explanations connecting molecular structure to a predicted macroscopic property, with the limits of the model stated. - Submit an equilibrium direction argument and an error log showing at least one corrected misconception, with exact book edition and section references. ## Answer and interpretation ### What mathematics should I check first? Rearrange c = n/V, convert 250 mL to 0.250 L, and interpret 10⁻³ before proceeding. Later acid–base work needs base-10 logarithms. If unit conversions fail, practise them before adding reaction coefficients. ### Do I need prior chemistry or a lab? No prior chemistry course is assumed for this route. Learn symbols, formulas and the mole as new vocabulary. The tasks here use invented quantities on paper; they neither certify laboratory competence nor ask you to perform reactions. ### How do I know that I understood a worked example? Hide the solution, state what is conserved, and solve a changed numerical case. Then explain why a tempting alternative is wrong. A matching final number without a balanced equation and units is incomplete evidence. ### A fictional reaction with a leftover reagent 1. The allowed reaction extents are 0.080/1 = 0.080 mol from A₂ and 0.180/3 = 0.060 mol from B₂. The smaller value makes B₂ limiting; comparing initial mole counts alone would give the wrong test. 2. At extent 0.060 mol, product is 2 × 0.060 = 0.120 mol AB₃. A₂ consumed is 0.060 mol, leaving 0.020 mol A₂; B₂ remaining is zero. 3. M(AB₃) = 10.0 + 3 × 5.0 = 25.0 g/mol. The theoretical product mass is 0.120 × 25.0 = 3.00 g. The claimed yield is 4.80/3.00 × 100% = 160%. 4. Check mass: initially A₂ contributes 1.60 g and B₂ contributes 1.80 g, total 3.40 g. Product 3.00 g plus leftover A₂ 0.400 g equals 3.40 g. The theoretical maximum is 0.120 mol (3.00 g) AB₃, with 0.020 mol A₂ left. The reported 160% is incompatible with the pure-product model; do not present it as an achievable conversion. Test the result: Count atoms as well as mass: initially A = 0.160 mol atoms and B = 0.360 mol atoms; product contains A = 0.120 and B = 0.360, with A = 0.040 in the residue. The anomalous yield signals failed assumptions or data, not proof of one particular cause such as moisture. ### Change an assumption: Follow-up: purity and recovery are different questions 1. Recovered AB₃ is 4.80 × 0.500 = 2.40 g, or 2.40/25.0 = 0.0960 mol. Its recovered yield relative to the 3.00 g maximum is 80.0%. 2. One compatible account is complete limiting-reagent conversion making 3.00 g AB₃, then loss of 0.600 g during recovery. Another is extent 0.0480 mol making 2.40 g with no AB₃ recovery loss, leaving 0.0360 mol B₂ and 0.0320 mol A₂. Recovered pure product is 2.40 g and its theoretical-yield percentage is 80.0%. The supplied measurement cannot distinguish incomplete reaction from product loss. The additional 2.40 g of non-AB₃ material is not evidence for one named contaminant. Test the result: The larger collection sample cannot close the original closed material balance once outside contamination is allowed. State the changed boundary; do not infer full conversion merely from an apparently corrected yield. ## Common mistakes ### Using the smaller mole count as the limiting test Compare n divided by the balanced coefficient. Amounts and stoichiometric requirements must use the same reaction basis. ### Treating bonds as energy containers that release energy when broken Separate bond breaking, which requires energy, from bond formation and the net change. Explain the whole process and the chosen system. ### Turning a six-stage route into a speed target Advance after producing the checkpoint evidence. Repeat a stage when the explanation and calculation disagree; chapter completion alone does not establish readiness. ## Sources and edition checks - [OpenStax: Chemistry 2e preface and contents](https://openstax.org/books/chemistry-2e/pages/preface) Confirms two-semester scope, free web/PDF access, worked examples and student answer availability. Its current preface states CC BY-NC-SA 4.0; free reading and reuse permission are different questions. - [Pearson: Chemistry: The Central Science, 15th edition](https://www.pearson.com/en-us/subject-catalog/p/chemistry-the-central-science/P200000006933) Confirms 15e contents, release/copyright distinction and separate print, eText and Mastering identifiers. Course-platform access is not inferred from a print copy. - [Michigan State University Libraries: CLUE, 2020](https://openbooks.lib.msu.edu/clue/) Uses the MSU Libraries 2020 publication identity and conceptual organization. The live page blocked direct retrieval during this check; indexed first-party metadata remained available. No unsupported pagination is assigned. - [OpenStax: Reaction yields](https://openstax.org/books/chemistry-2e/pages/4-4-reaction-yields) The section supplies the limiting-reactant/yield method. The A/B substances, quantities and worked solution above are original to this guide. These are proposed study activities, not official course assignments or a claim that every book has been read cover to cover. [How we curate](https://unireadinglist.com/editorial/)