Introduction
Success in IB Chemistry is not just about knowing content. It’s also about understanding how examiners mark your work. The IB uses very specific marking schemes that reward certain skills and penalize common mistakes.
Many students struggle because they write what they think is a “good answer” without realizing it doesn’t match the mark scheme. This guide provides a detailed breakdown of IB Chemistry marking schemes, showing how they work and how you can use them to your advantage.
Why Marking Schemes Matter
Marking schemes are the examiner’s blueprint. They:
- Define the exact expectations for each question.
- Show how many marks are available for specific steps.
- Provide consistency across thousands of IB candidates.
- Help students see where marks are lost unnecessarily.
By studying marking schemes, you learn how to structure answers the way examiners want — which often means earning marks even without a perfect final answer.
How IB Chemistry Papers Are Structured
IB Chemistry is assessed through three written papers plus Internal Assessment (IA):
- Paper 1: Multiple-choice questions (SL and HL).
- Paper 2: Short-answer and extended-response questions.
- Paper 3: Data-based questions and practical application.
- IA: A 10-hour individual investigation (20% of the grade).
Each paper has its own marking scheme style, which you need to understand to maximize your score.
Paper 1: Multiple-Choice Marking
- Marking is straightforward: 1 mark per correct answer.
- No partial credit.
