CHEM1011 · Chemistry 1a
The Complete Exam Bible · T2 2026Chemistry 1A
CHEM1011 Chemistry 1A (Atoms, Molecules and Energy) is UNSW Sydney's first-year general chemistry course, a 6-unit-of-credit (UOC) course in the School of Chemistry taught over the ten teaching weeks of Term 2. Its syllabus is split into two tiers: Threshold content — the pass-level material delivered by self-paced Moodle lessons and assessed every week — and Mastery content — the merit-level theory (Rydberg spectra, molecular-orbital diagrams, the van 't Hoff and Nernst equations) delivered in live lectures and tutorials and assessed in the final exam. The eight topics run from the quantisation of energy and atomic structure through bonding, VSEPR and intermolecular forces to equilibrium, acids and bases, thermochemistry and electrochemistry, with a weekly laboratory program running alongside. Assessment is built on four components: two in-person in-term Threshold tests (32%), weekly Moodle Threshold quizzes (8%), skills-based laboratory work (20%), and a 40% in-person final exam held in the UNSW examination period — the largest single weight and where the Mastery theory is examined. The course is passed on a hurdle system: you must attend at least six laboratory classes, be awarded all core laboratory skills, and achieve an overall course mark of at least 50, so a strong student can clear every written task and still fail on the lab-skills hurdle. Your CHEM1011 mark feeds the Weighted Average Mark (WAM) that later chemistry and science courses build on, and the UNSW grade scheme runs HD (85+), DN (75–84), CR (65–74), PS (50–64) and FL. The final-exam details are released in Week 9, so confirm the exact date, duration and permitted materials on Moodle and the UNSW exam timetable.
What CHEM1011 covers
CHEM1011 runs over 10 teaching weeks in UNSW Term 2, moving from quantised energy and atomic structure through bonding and molecular shape, intermolecular forces, equilibrium, acids and bases, thermochemistry and finally electrochemistry. Each topic is split into Threshold content (tested in weekly quizzes and the two in-term tests) and Mastery content (assessed in the 40% final exam), and every unit is reinforced by the weekly laboratory program. This guide follows that teaching order so each chapter maps to the week and the assessment that tests it.
How CHEM1011 is assessed
| Component | Weight | Format |
|---|---|---|
| In-Term Tests for Threshold Content (2 tests) | 32% | In person in the exam timeslot, Week 5 and Week 9; 20 questions similar to the weekly quizzes, 45 minutes each |
| Weekly Threshold Quizzes | 8% | On Moodle every Monday 9:00 AM (Weeks 3-5, 7-10); unlimited attempts, but you must score 10/10 on a topic quiz in at least one attempt before its deadline to earn that quiz's 1% — 9/10 scores zero for the whole quiz |
| Final Exam | 40% | In person during the UNSW examination period; mix of question styles and lengths; a mock/practice paper is provided; details released in Week 9 |
| Laboratory Work | 20% | Weekly skills-based assessment; core skills = 10/20, non-core marks scaled by pre-lab quiz average |
Standard cell potential and spontaneity of a Zn–Cu galvanic cell
- +1The couple with the more positive reduction potential is reduced (the cathode): Cu²⁺/Cu at +0.34 V. The more negative couple is oxidised (the anode): Zn²⁺/Zn at −0.76 V — so zinc metal dissolves and copper deposits.
- +1Standard cell potential E°cell = E°(cathode) − E°(anode) = 0.34 − (−0.76) = +1.10 V. A positive E°cell means the cell reaction is spontaneous as written.
- +1The half-equations Zn → Zn²⁺ + 2e⁻ and Cu²⁺ + 2e⁻ → Cu transfer n = 2 electrons, so ΔG° = −nFE°cell = −(2)(96485)(1.10).
- +1ΔG° = −212267 J mol⁻¹ ≈ −212 kJ mol⁻¹. ΔG° < 0 confirms spontaneity, consistent with the positive E°cell.
Key terms
- The mole (n)
- The SI amount of substance; one mole contains Nₐ = 6.022 × 10²³ entities. Moles from mass n = m/M (M = molar mass, g mol⁻¹); molar concentration c = n/V (mol L⁻¹). The mole is the bridge between the masses you weigh and the particles that react.
- Equilibrium constant (K)
- For a A + b B ⇌ c C + d D, K = ([C]ᶜ[D]ᵈ)/([A]ᵃ[B]ᵇ) using equilibrium concentrations (pure solids/liquids omitted). K depends only on temperature; K ≫ 1 favours products, K ≪ 1 favours reactants. The reaction quotient Q has the same form for non-equilibrium concentrations.
- pH and Kw
- pH = −log₁₀[H⁺] and pOH = −log₁₀[OH⁻]; water self-ionises with Kw = [H⁺][OH⁻] = 1.0 × 10⁻¹⁴ at 25 °C, so pH + pOH = 14. Neutral pH is 7, acidic below 7, basic above 7.
- Gibbs energy (ΔG)
- ΔG = ΔH − TΔS (T in kelvin) decides spontaneity at constant T and pressure: ΔG < 0 spontaneous, ΔG > 0 non-spontaneous, ΔG = 0 at equilibrium. It links to the equilibrium constant by ΔG° = −RT ln K.
- Standard cell potential (E°cell)
- E°cell = E°(cathode) − E°(anode), both taken as standard reduction potentials. A positive E°cell marks a spontaneous galvanic cell and relates to free energy by ΔG° = −nFE°cell.
- Threshold vs Mastery content
- CHEM1011's two-tier syllabus. Threshold is the pass-level material delivered by self-paced Moodle lessons and assessed in the weekly quizzes and two in-term tests; Mastery is the merit-level theory (Rydberg, MO diagrams, van 't Hoff, Nernst) delivered in lectures and tutorials and assessed in the 40% final exam.
CHEM1011 FAQ
Is CHEM1011 hard?
CHEM1011 is broad rather than deeply mathematical: eight topics in ten weeks, each split into Threshold (pass-level) and Mastery (merit-level) content, plus a weekly lab program. The calculations — mole ratios, pH, the equilibrium constant K, ΔG and E°cell — use simple data-sheet formulas, so most marks go to setting them up with the right units and interpreting the answer rather than to hard algebra. What catches students out is the hurdle structure (you must clear the lab attendance and core-skills hurdles and score at least 50 overall) and the weekly 10/10-or-nothing quiz gate. Students who keep up with the self-paced Moodle lessons, draw the recurring diagrams and rehearse the calculations each week tend to find it manageable; steady work also protects your Weighted Average Mark (WAM).
Can AI help me with CHEM1011?
Yes, as a step-by-step study aid. Sia is an AI tutor built to mirror how CHEM1011 is actually taught and assessed at UNSW Sydney: it can walk you through a Rydberg-equation spectral line, an electron configuration, an ICE-table equilibrium, a Henderson–Hasselbalch buffer, a ΔG = ΔH − TΔS spontaneity check or a Nernst calculation one line at a time, and it checks your reasoning as you go. Bring your own tutorial or past-paper question and ask Sia to explain each step. It does not do graded assessment for you — no homework or exam answers — and the UNSW academic-integrity and plagiarism policy still applies; use it to understand the method, not to produce work you submit.
Where can I find past exam papers / practice for CHEM1011?
Start on Moodle, where the course posts its final-exam information (released in Week 9) and the mock/practice paper, along with the Periodic Table and Data Sheet you are given in the exam. The weekly Threshold quizzes and the tutorial problem sets are the closest match to the in-term tests. This guide also includes a re-authored practice exam that mirrors the paper's shape — spectra, atomic structure, bonding, equilibrium, pH, thermochemistry and electrochemistry — with fresh numbers, and you can ask Sia to generate extra practice in the same style and explain each step. Treat any third-party 'model answers' with caution and confirm what is officially provided on Moodle.
What are the CHEM1011 hurdles and assessment rules?
To pass CHEM1011 you must do three things: attend at least six laboratory classes, be awarded all core laboratory skills, and achieve an overall course mark of at least 50. The lab manual's core-skill list is long — it covers the safety and ethics inductions, fume-cupboard induction, chemical and analytical glassware, weighing, heating materials, titration and scientific graphing — and missing any one of them fails the lab component and therefore the course, so track your skills report on the lab web page. A student can pass every written task and still fail on the lab-skills hurdle, so the labs are not optional. The weekly Threshold quizzes also have an internal gate — attempts are unlimited, but you must score 10/10 on a topic quiz in at least one attempt before its deadline to earn that quiz's marks; 9/10 scores zero for the whole quiz, and each topic quiz is worth 1% of the course mark. The four components weight as In-Term Tests 32%, Weekly Quizzes 8%, Final Exam 40% and Laboratory Work 20%; confirm the current rules on Moodle and the UNSW course outline.
What is on the CHEM1011 final exam?
A single in-person paper worth 40%, held in the UNSW examination period, covering all eight topics with a mix of question styles and lengths. It is where the Mastery theory is examined — Rydberg spectra, molecular-orbital diagrams and bond order, the van 't Hoff equation and the Nernst equation appear here rather than in the weekly quizzes — sitting on top of the Threshold underpinning. A Periodic Table and Data Sheet (constants and the standard equations) is provided, so the emphasis is on applying formulas, not memorising them. The exact duration and section structure are released in Week 9, so confirm the date, time and room on Moodle and the UNSW exam timetable.
How to study for the exam
Treat CHEM1011 as two habits running in parallel rather than one reading unit, and keep up week by week because the hurdle structure punishes falling behind. First, service the Threshold layer every week: work the self-paced Moodle lessons and take the weekly quiz seriously — each topic quiz gates 10/10-or-nothing, so a careless slip on one easy item forfeits that quiz's whole 1%. Second, build the Mastery layer for the 40% final exam by rehearsing the recurring calculations until they are automatic: a Rydberg line then its photon energy, an electron configuration and its ion, an ICE table with the small-x check, a Henderson–Hasselbalch buffer, a Hess/ΔG spontaneity argument, and an E°cell/Nernst cell. Because the exam supplies the Periodic Table and Data Sheet, practise applying each formula with correct units and a sanity check, not memorising it. Protect the two non-negotiable hurdles early — attend at least six lab classes and secure every core lab skill — and remember the overall pass mark of 50. Draw the standard diagrams (energy-level diagrams, VSEPR shapes, MO diagrams, titration curves, galvanic cells) from memory, since they recur across topics and across the in-term tests and the exam. When a step will not click, ask Sia to explain that single step a different way and set you a fresh practice question in the same style; it teaches the method and checks your reasoning, and it never substitutes for your own graded work. Confirm the final-exam date, room and permitted materials on Moodle and the UNSW exam timetable, and keep an eye on how each result feeds your WAM under the HD/DN/CR/PS/FL scheme.
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