A week before an IB Chemistry exam, a lot of students do the same thing: they study harder.
And then they walk out thinking, “I knew that. Why didn’t I get the marks?”
That gap -- between knowing and scoring -- is where most IB Chemistry grades are decided. Not by one heroic all-nighter, but by tiny, repeatable mistakes: answering the wrong command term, losing a unit, skipping a justification, or spending ten minutes polishing a diagram no one asked for.
This guide breaks those patterns and replaces them with a calmer, more reliable approach built around RevisionDojo’s practice loop.
IB Chemistry units and sig figs panic comic
A quick checklist to stop losing easy marks in IB Chemistry
Use this as your last-minute scan before each practice set or mock:
Match your response to the command term (not your mood).
Write units on every line of working, not just at the end.
Show method clearly to earn method marks even if the final value is off.
In data/practical questions, always talk about uncertainty, limitations, and improvements.
Train under time pressure at least weekly, then review mistakes the same day.
In IB Chemistry, command terms are the hidden marking scheme. “Outline” is not “explain.” “Evaluate” is not “describe.” If you answer with the wrong depth, you can be capped even if your chemistry knowledge is strong.
A simple habit: before you write, translate the command term into a micro-plan.
Outline: 2--4 key points, minimal detail.
Explain: cause-and-effect, mechanism, or reasoning.
Evaluate: pros, cons, then a justified conclusion.
To practice this deliberately, use RevisionDojo’s Questionbank and tag every miss as either “chemistry gap” or “command term mismatch.” That one label changes how you revise.
IB Chemistry command terms comic
Mistake 2: Memorising without being able to transfer
Most IB Chemistry questions are polite traps: familiar content in an unfamiliar setting. You might know Le Châtelier’s principle, but can you apply it when the question swaps a concentration change for a pressure change, or embeds it inside a data table?
The fix is to revise in “application mode”:
Learn the idea quickly (Study Notes).
Test it immediately (Questionbank).
Explain it out loud in one minute (AI Chat).
Lock key definitions and relationships (Flashcards).
If you’re building foundations or re-learning a topic cleanly, use topic pages like R2.2.1 Rate of reaction and structured lessons such as S2.4 From models to materials lessons. This keeps your IB Chemistry revision syllabus-first instead of panic-first.
Mistake 3: Calculation errors that start two lines earlier
In IB Chemistry, the final answer is often where you notice the mistake -- but the mistake usually happened earlier: a unit conversion, a missing exponent, a rounded intermediate value, or a copied number.
Two rules that save marks:
Put units on every meaningful step (especially with concentration, pressure, energy, and rates).
Keep working visible and linear so method marks are obvious.
Then drill calculations in clusters. For example, if energetics is a weak spot, do focused sets from Energetics and Thermochemistry Questionbank until you stop making the same unit mistake twice.
For quick, exam-ready summaries, pair practice with IB Chemistry cheatsheets. The point is not to “read more” -- it’s to reduce decision fatigue when you calculate under time.
Mistake 4: Writing vague practical and data answers
Paper 3-style thinking shows up everywhere in IB Chemistry: data-based questions, experimental design, evaluation, uncertainty. Students often lose marks by saying true-but-empty things like “human error” or “use better equipment.”
A stronger template:
Limitation: what exactly is weak (precision, calibration, heat loss, endpoint detection)?
Effect: how it changes the result (systematic vs random, higher/lower, wider spread)?
Improvement: a specific fix that matches the limitation.
RevisionDojo helps here because you can practice and then immediately compare your wording to markscheme-style phrasing using AI Chat and grading tools, instead of guessing what “evaluate” should look like in IB Chemistry.
Mistake 5: Timing that collapses at the worst moment
Students rarely run out of knowledge. They run out of minutes.
So build stamina like a chemistry athlete:
Once a week, sit a full timed section.
Same day: review every dropped mark and name the pattern.
Next day: do a targeted Questionbank set on that pattern.
Closing: Turn IB Chemistry into a repeatable system
The students who do best in IB Chemistry aren’t the ones who never make mistakes. They’re the ones who spot their mistakes early, name them clearly, and train around them until those errors run out of places to hide.
If you want that kind of calm momentum, build your loop with RevisionDojo: Study Notes for clarity, Flashcards for recall, Questionbank for volume, AI Chat for fast unblocking, grading tools for markscheme accuracy, and Predicted Papers and Mock Exams for full exam rehearsal.
Start here: IB Chemistry resources on RevisionDojo -- and make your next practice session the one where you stop losing the same easy marks in IB Chemistry.
Daniel holds an MSc in Chemistry from Imperial College London and has taught IB Chemistry for over 20 years, including as Head of Chemistry. His focus is on building the conceptual understanding behind each equation rather than rote recall.
