How to Study Chemistry: The Method That Actually Works

Every semester it's the same story. Someone who cruised through high school chemistry hits gen chem, studies the way they always have, and gets a 58 on the first midterm. They knew the material. They'd read the chapter three times, highlighted everything, made beautiful notes. And then the exam asked them to actually do something with it, and everything fell apart.

What almost nobody tells you about how to study chemistry is that it isn't one subject. It's two subjects wearing the same name, and they need opposite study methods. Students fail chemistry not because they're lazy but because they study the whole course with a method that only works on half of it.

Why Chemistry Breaks Study Habits That Worked Everywhere Else

Think about what's actually in a gen chem course.

Some of it is pure memory. Polyatomic ions, nomenclature rules, solubility rules, periodic trends, which acids are strong. There's no deriving your way to "sulfate is SO₄²⁻" in the middle of an exam. You know it or you don't.

The rest is skill. Stoichiometry, gas laws, equilibrium, acid-base calculations, thermochemistry. This half behaves like math. Rereading the chapter does nothing for it, the same way rereading a chapter on free throws doesn't improve your free throws. You get better by working problems, badly at first, then less badly.

Most students pick one strategy for the whole course. The memorizers flashcard everything and freeze when an exam problem has three steps. The "I just need to understand the concepts" crowd nod along with every lecture and then blank on names and formulas that were free points. Both groups put in real hours. Both get burned, because half their effort used the wrong tool.

There's solid evidence behind that diagnosis. A major 2013 review of learning techniques by John Dunlosky and colleagues rated the most popular study methods, and the ones chemistry students lean on hardest, namely rereading, highlighting and summarizing, all landed in the lowest usefulness tier. The winners were practice testing and spacing study over time. Neither of those is what most people do the night before a chem exam.

Step 1: Sort the Course Into Its Two Halves

Before your next study session, take the syllabus or the chapter list and label every topic M or P.

M topics (memorize): polyatomic ions, naming rules, solubility rules, strong acids and bases, periodic trends, common charges, unit conversions and constants.

P topics (practice): stoichiometry, limiting reagents, molarity and dilutions, gas laws, thermochemistry, equilibrium, titrations, kinetics.

Plenty of topics have a foot in each camp. Lewis structures need memorized rules and drawing practice. Fine. Label the parts separately. The point of the exercise is that from now on, you never sit down to "study chemistry". You sit down to drill M material or to work P problems, and those are different sessions with different methods.

Step 2: Put the Memory Half on a Spaced Schedule

The M pile is flashcard territory, and it's the one place in chemistry where flashcards are genuinely the right call. Two rules make them work.

First, test, don't reread. Cover the answer, produce it from memory, then check. The Dunlosky review put practice testing at the top for exactly this reason, and every pass where you just look at the card is a pass wasted.

Second, space it. Ten minutes on polyatomic ions today, again in two days, again next week, beats an hour of them the night before the exam, with hours to spare. That's spaced repetition, and the M half of chemistry might be the single best use case for it in any course you're taking.

Making the cards is the boring part, and it's where the plan usually dies in week three. If that's you, upload your notes or the textbook chapter to StudyLab and let it generate the flashcards and quiz questions, then spend your time on the actual testing.

The ions deserve a special mention because they're the tax you pay for the whole course. Every formula you write, every equation you balance, every stoichiometry problem assumes they're instant. Get them automatic in week one and every later chapter gets easier.

Step 3: Study Worked Examples Before You Grind Problems

Now the P half, and this is where the good research surprises people.

The instinct is to jump straight into the problem set. But in a classic 1985 series of experiments in the journal Cognition and Instruction, John Sweller and Graham Cooper found that beginners learned algebra faster from studying worked examples than from solving the equivalent problems themselves. The problem-solvers took nearly six times longer and made far more errors along the way, because floundering through a problem you don't yet have a method for eats your mental capacity without teaching you the method.

For chemistry, that means when a problem type is new, your first move is to work through two or three solved examples slowly. And "work through" has a specific meaning here. Explain each step to yourself. Why moles here? Why is this the limiting reagent? Where did that conversion factor come from? A famous study of physics students by Michelene Chi found the successful ones did exactly this, generating explanations at every step, while the strugglers read the same solutions and just nodded along. That gap has a name, and the self-explanation effect is the closest thing chemistry has to a cheat code, because "I understood the example" and "I can reproduce the example" feel identical until the exam.

One honest caveat. The worked-example advantage is for beginners. Once you can solve a problem type reliably, studying more examples actually holds you back, a finding researchers call the expertise reversal effect. So use examples as the on-ramp, not the destination. Two or three explained examples, then straight to solving on your own.

Step 4: Mix the Problem Types Instead of Blocking Them

Textbooks arrange problems in blocks. Fifteen gas law problems, then fifteen stoichiometry problems. Block practice feels great, because by problem six you're on autopilot.

That autopilot is the problem. On the exam, nobody tells you which chapter a question comes from. Figuring out what kind of problem you're looking at is half the skill, and blocked practice never trains it.

The fix is interleaved practice, which means shuffling problem types within one session. And this isn't borrowed faith from math research. A 2017 study by Luke Eglington and Sean Kang taught undergraduates to classify organic chemical compounds and found that mixing the categories during study beat blocking them when tested two days later. Once you're past the worked-example stage on two or three problem types, pull questions from all of them into one shuffled set and make identifying the problem type part of the practice.

Step 5: Draw the Invisible Stuff

Chemistry lives at three levels at once. The stuff you can see, the molecules you can't, and the symbols on the page. Students who only ever touch the symbols end up pushing letters around without any picture of what's happening in the flask.

So draw. Sketch the particles in a dilution. Draw what ions are floating around before and after a precipitation. Ugly is fine. Pairing a verbal explanation with your own rough visual is dual coding, and it gives every concept a second handle in memory. For gas laws and equilibrium especially, the students who can draw the situation are the ones who catch their own nonsense answers, because 400 litres of coffee from one tablet looks wrong in a way the algebra never does.

A Week That Actually Works

Here's the shape of a chem week using all of it, sized for a typical gen chem load.

Mon (30 min): M drill. Flashcards on ions, naming, rules. Spaced, tested, no rereading.
Tue (60 min): New problem type. Three worked examples, self-explained step by step, then four problems on your own.
Wed (30 min): M drill again, shorter. Add anything new from this week's lectures.
Thu (60 min): Interleaved problem session. Ten problems drawn from every type covered so far, shuffled.
Weekend (45 min): One mixed mini-test under exam conditions. No notes, no solutions until the end. Wrong answers tell you what Monday's session is.

Three and a half hours, and every minute is either retrieval or problem-solving. Compare that with one heroic four-hour Sunday reread, which the research says buys you almost nothing.

FAQ

Why do I understand chemistry in class but fail the exams?

Because following a solution and producing one are different skills, and class only trains the first. The professor's worked example makes sense the way a magic trick makes sense while someone explains it. The fix is testing yourself cold on problems without the solution in view, days before the exam rather than the night before.

What's the best way to memorize polyatomic ions?

Spaced retrieval practice. Short flashcard sessions where you produce name, formula and charge from memory, repeated over a week or two with growing gaps. Patterns help too, like the -ate to -ite relationship, since noticing structure beats brute force. Expect them to be automatic after about two weeks of ten-minute sessions.

Is chemistry harder than biology?

It's differently hard. Biology is heavy on memory, so pure memorization strategies mostly work. Chemistry stacks a skill component on top, and each chapter builds on the last, so a gap in week two resurfaces in week ten. That cumulative structure is why cramming fails harder in chemistry than in almost any other course.

Can I be good at chemistry if I'm bad at math?

Usually yes, because gen chem math is mostly algebra and unit conversions rather than anything exotic. What matters is fluency, not brilliance. If the algebra is shaky, drilling rearrangement and unit-factor problems for a week pays off fast, and the techniques in how to study math effectively transfer to the P half of chemistry almost unchanged.

How many hours a week should I study chemistry?

For a typical gen chem course, three to five focused hours outside class beats ten passive ones. The schedule above runs about three and a half. If you're putting in more than that and still struggling, the problem is almost always the method, not the hours. Audit how much of your time is rereading, and convert it to testing and problems.

The Split Is the Strategy

Chemistry stops being mysterious once you stop treating it as one subject. Sort every topic into memorize or practice. Put the memory half on spaced flashcards. Enter each new problem type through self-explained worked examples, leave through interleaved problem sets, and draw what the symbols are hiding. That's the whole system.

Start tonight with the sort. It takes fifteen minutes with the syllabus. Then take whichever chapter your first exam covers, upload it to StudyLab, and let it turn the chapter into flashcards and practice questions so the testing can start tomorrow instead of "once the cards are ready".