HSC Chemistry · Year 12
HSC Chemistry: what actually gets examined
Every question from 4 official NESA papers, coded by module, topic and marks — so you can decide what to revise from evidence rather than a feeling.
4 NESA papers, 2022–2025 · 174 questions · 400 marks
HSC Chemistry spreads its 400 marks over 16 topics, the biggest carrying 14%, and the 4 modules carry almost identical weight. There is nothing here you can safely skip — the question is what order you revise in.
Counted from 4 official NESA Chemistry papers (2022–2025). 174 questions, 400 marks. Nothing estimated.
The key words that carry the paper
Share of written-response questions by NESA key word. Revising the content without revising the directive is how marks get lost. The lower / middle / higher grouping is ours — NESA publishes the glossary but does not band it. Based on the 28% of written responses that open with a glossary key word; the rest open with wording outside it, such as “State” or a direct question.
Lower orderMiddle orderHigher order
Each tile is one key word; its size is that key word's share of written-response questions that open with one. The smallest 3 are grouped as Other: Analyse 4% · 1q, Construct 4% · 1q, Justify 4% · 1q.
Where the marks sit
Each module with its topics underneath. The bar is that topic's share of its own module.
Module 5: Equilibrium and Acid Reactions
107 marks25% indicative weighting, quoted from the syllabus
16 questions · 27% of this module
12 questions · 25% of this module
12 questions · 24% of this module
10 questions · 19% of this module
2 questions (6 marks) in this module were set across the whole module rather than on one topic. They are counted in the module total above, but they do not say which topics they examined — so the consistency chips are withheld here rather than guessed.
Concept pages in this module:
Module 6: Acid/Base Reactions
99 marks25% indicative weighting, quoted from the syllabus
23 questions · 55% of this module
12 questions · 22% of this module
10 questions · 21% of this module
1 question (4 marks) in this module was set across the whole module rather than on one topic. It is counted in the module total above, but it does not say which topic it examined — so the consistency chips are withheld here rather than guessed.
Concept pages in this module:
Module 7: Organic Chemistry
98 marks25% indicative weighting, quoted from the syllabus
15 questions · 27% of this module
15 questions · 22% of this module
5 questions · 12% of this module
6 questions · 11% of this module
8 questions · 11% of this module
5 questions · 6% of this module
4 questions (11 marks) in this module were set across the whole module rather than on one topic. They are counted in the module total above, but they do not say which topics they examined — so the consistency chips are withheld here rather than guessed.
Concept pages in this module:
Module 8: Applying Chemical Ideas
97 marks25% indicative weighting, quoted from the syllabus
25 questions · 46% of this module
12 questions · 32% of this module
8 questions · 23% of this module
Concept pages in this module:
Across 4 papers the modules carried 107, 99, 98, 97 marks — against a 25% indicative weighting each, quoted from the NESA Chemistry Stage 6 Syllabus (2017). The counted share and the published weighting are two different measures.
How each topic gets asked
The 6 biggest topics, by the shape of the questions actually set on them. Revising the content without revising the directive is how marks get lost — the key words below are NESA's own, counted from the papers.
Quantitative Analysis
Module 6: Acid/Base Reactions · 54 marks across 23 questions
Asked as Multiple choice ×10 · Short answer ×10 · Extended response ×3
NESA key words Calculate ×2 · Explain ×1
Analysis of Inorganic Substances
Module 8: Applying Chemical Ideas · 45 marks across 25 questions
Asked as Multiple choice ×10 · Short answer ×15
NESA key words Calculate ×1 · Explain ×1 · Outline ×1 · Describe ×1 · Identify ×1
Analysis of Organic Substances
Module 8: Applying Chemical Ideas · 31 marks across 12 questions
Asked as Multiple choice ×6 · Short answer ×2 · Extended response ×4
NESA key words Describe ×1
Factors that Affect Equilibrium
Module 5: Equilibrium and Acid Reactions · 29 marks across 16 questions
Asked as Multiple choice ×7 · Short answer ×8 · Extended response ×1
NESA key words Explain ×3 · Identify ×1
Solution Equilibria
Module 5: Equilibrium and Acid Reactions · 27 marks across 12 questions
Asked as Multiple choice ×8 · Short answer ×1 · Extended response ×3
NESA key words Calculate ×1
Calculating the Equilibrium Constant
Module 5: Equilibrium and Acid Reactions · 26 marks across 12 questions
Asked as Multiple choice ×6 · Short answer ×5 · Extended response ×1
NESA key words Calculate ×1
How the paper is built
Marks by question format across the same 4 papers.
Multiple choice is exactly 20 marks in every paper. The rest moves around: short answer ran 54, 54, 61, 56 marks and extended response ran 26, 26, 19, 24 marks. 4 papers is not enough to call that a trend.
The papers this is counted from
NSW Education Standards Authority publishes every paper and its marking guidelines. These links go to NESA's own copies — read the questions there.
These are the external examination papers. They are not the whole subject: Chemistry is also assessed by school-based assessment set and marked by your school, which NESA does not publish — so nothing on this page covers that part of your result.
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Frequently Asked Questions
Which HSC Chemistry topics come up every year?
Not published for every module yet. 7 questions in the papers on file were set across a whole module rather than on one topic. Because they do not say which topics they examined, a topic that WAS examined could look absent — so the chips are withheld in the affected modules rather than guessed.
Which HSC Chemistry module is worth the most marks?
Module 5: Equilibrium and Acid Reactions 107, Module 6: Acid/Base Reactions 99, Module 7: Organic Chemistry 98, Module 8: Applying Chemical Ideas 97 marks across the 4 papers analysed. The syllabus publishes an indicative weighting for each; the counted share and the published weighting are two different measures.
What is the biggest single topic in HSC Chemistry?
Quantitative Analysis, with 54 of the 400 marks counted across 4 papers.
How was this analysed?
Every question in 4 official NESA HSC Chemistry papers (2022–2025) was counted against the NESA Chemistry Stage 6 Syllabus (2017): its mark value, its format and its key word, and the module and topic it assesses. Marks are reconciled against each paper's own stated total.
Are the exam questions reproduced here?
No. NSW Education Standards Authority owns the papers. This page publishes counts and links to NESA's own copy of each paper so you can read the questions at the source. The analysis is ours; the papers stay with NESA.
Does this predict what will be in my exam?
No, and it is not meant to. It describes what has been set. Examiners write each paper fresh and can weight a neglected topic heavily, which is why every topic is listed here, including the ones examined least.
Coded against the NESA Chemistry Stage 6 Syllabus (2017). Where a question is coded to more than one topic its marks are split evenly, so topic totals within a module can round a mark or two above the module total. Last updated 2026-08-30 · Exam papers © NSW Education Standards Authority, linked at source.