How to Study for the ACS General Chemistry Final Exam
If you're reading this, you're probably about two weeks out from an ACS final and just realized this is not going to look anything like the exams you've taken all semester. Welcome to the club. Your professor didn't write this one. The American Chemical Society did, and they have a very specific idea of what you should know, along with a very specific way of asking about it.
Here's the format: 70 multiple-choice questions, 110 minutes, zero partial credit, scored against a national percentile curve. That last part matters more than you think; your raw score gets compared to every other student in the country taking the same form. A raw score of 70% might land you in the 90th percentile, or the 80th, depending on the difficulty of your particular form and the cohort taking it. Your professor decides how to map percentiles to letter grades, so if you haven't asked about that yet, now is the time.
It's a breadth exam, not a depth exam.
Your regular midterms covered 3–5 chapters at a time. The ACS final covers the entire year or semester, depending on which form your school uses. That means a question on calorimetry might sit right next to one on molecular orbital theory, followed by a Lewis acid–base problem you haven't thought about since September. Nothing dominates, but in my experience grading and tutoring these exams, stoichiometry, equilibrium, acid–base chemistry, and thermodynamics consistently carry the most weight. Atomic structure, bonding, kinetics, electrochemistry, and gas laws fill in the rest.
The other thing that catches students off guard is the question style. ACS questions lean heavily conceptual. You'll see fewer "plug and chug" problems and more questions asking you to predict what happens, compare two systems, or interpret a graph or diagram. If your study strategy so far has been memorizing equations and grinding calculations, it's time to shift gears. You need to understand why things happen, not just how to compute them. A student who deeply understands Le Châtelier's principle will outscore a student who memorized the equilibrium expression but can't reason about what happens when you add a reactant.
The three mistakes I see every single time.
Mistake 1: Re-reading notes. I get it; it feels productive. You're sitting there with a highlighter, going through your notebook, and it genuinely seems like studying. But cognitive science is clear on this: re-reading produces almost no measurable improvement on a multiple-choice exam that tests application. The ACS doesn't ask you to recall definitions. It asks you to use concepts on problems you've never seen. The only way to prepare for that is to practice solving unfamiliar problems under realistic conditions. Period.
Mistake 2: Spreading study time equally across all topics. If you already have gas laws and stoichiometry locked down, spending three hours reviewing them is three hours you could have spent on thermodynamics or equilibrium, the topics where you're actually losing points. Triage your study time. Identify your weak spots and attack those. That's where the points are, and your time is not infinite.
Mistake 3: Never practicing under timed conditions. You get roughly 90 seconds per question on the ACS. That's tight. If something takes you more than two minutes, mark it, move on, come back. Practicing that discipline before exam day is the difference between composed and panicked. I've seen strong students bomb the ACS purely because they spent seven minutes on one question and ran out of time with 15 questions unanswered. Don't be that student.
A realistic two-week plan.
Week 1: Take a diagnostic. A practice exam, old homework problems, a topic-by-topic self-quiz: whatever you can get your hands on. The goal is honest self-assessment. Which 3–4 topics are your weakest? Be brutal with yourself here. Then spend the rest of Week 1 doing focused practice on those weak areas. For every question you miss, write down why you missed it; not just the right answer, but the specific concept you misunderstood or the step you skipped. That written record becomes your study guide for Week 2.
Week 2: Take a full-length timed practice exam. 70 questions, 110 minutes, no notes, no phone. Grade it honestly. Go through every miss and re-derive the solution from scratch. Those missed questions are your final-week study targets. The night before the real thing? Light review and actual sleep. Cramming the night before an exam this broad is like trying to drink from a fire hose; you won't retain anything useful, and you'll be exhausted during the test.
Quick self-test.
1. A 2.00 g sample of an unknown metal is heated to 95.0 °C, then placed in 50.0 g of water at 22.0 °C. The final temperature is 23.8 °C. What is the specific heat of the metal?
2. For N₂O₄(g) ⇌ 2 NO₂(g), Kc = 4.6 × 10⁻³ at 25 °C. If only N₂O₄ is initially present at 0.50 M, what is the equilibrium concentration of NO₂?
3. Which has the highest boiling point: CH₃OH, CH₃CH₃, or CH₃F? Explain in terms of intermolecular forces.
If you nailed all three without hesitating, you're in solid shape. If any of them tripped you up, those topics just moved to the top of your study list, and that's valuable information to have two weeks out.
For ACS-format practice with detailed explanations for every question, the topic-by-topic ACS practice packets at drmaralearning.com cover all eight major exam areas.
