Searchers often ask how many questions are on the HKDSE Chemistry exam and what score counts as a pass, expecting an answer like a driving test or a professional licensing exam. The real answer is that neither of those exists in the form most people expect, and the actual structure is a Compulsory Part plus an Elective Part, graded on a Level scale.
How many questions are on the HKDSE Chemistry exam?
The exam is not built around a fixed count of questions the way a multiple-choice licensing test is. HKEAA assesses Chemistry through a Compulsory Part, sat by every candidate, and an Elective Part, where a school selects two of three elective units for its students. Questions mix multiple-choice items with structured questions marked on a points scale, so the total number of discrete “questions” is not a single published figure the way total marks or paper structure are.
Is there a pass mark for HKDSE Chemistry?
No, and this is the detail most searches get wrong. HKEAA does not publish a fixed pass mark for Chemistry or any other DSE subject. Results are reported on a Level 1 to 5 scale, from 1 up to 5, 5*, and 5** at the top, using standards-referenced grading: examiners set the boundary for each level after that year’s scripts have been marked, based on the quality of work at each level, not a percentage agreed in advance. There is no number to memorise the way there is for a fixed pass/fail licensing exam.
What is the Compulsory Part?
The Compulsory Part covers twelve topics that every candidate studies, moving from the chemicals around us to atomic structure, reaction behaviour, and organic chemistry:
- Planet Earth: the atmosphere, the ocean, and rocks and minerals as sources of the chemicals around us.
- Microscopic World I: atomic structure, the Periodic Table, metallic, ionic and covalent bonding, and how structure decides the properties of a substance.
- Metals: where metals occur, how they are extracted, the reactivity series, reacting masses, and corrosion and its prevention.
- Acids and Bases: acids and alkalis, indicators and pH, strong and weak, salts and neutralisation, concentration, and volumetric analysis.
- Fossil Fuels and Carbon Compounds: hydrocarbons from fossil fuels, homologous series and naming, alkanes and alkenes, and addition polymers.
- Microscopic World II: bond and molecular polarity, intermolecular forces, the structure of ice, non-octet structures, and the shapes of simple molecules.
- Redox Reactions, Chemical Cells and Electrolysis: everyday chemical cells, the reactions inside them, oxidation and reduction, and electrolysis.
- Chemical Reactions and Energy: energy changes in reactions, standard enthalpy changes, and Hess’s law.
- Rate of Reaction: how reaction rate is measured, the factors that change it, and the molar volume of gases at room temperature and pressure.
- Chemical Equilibrium: dynamic equilibrium, the equilibrium constant, and how concentration and temperature shift a position of equilibrium.
- Chemistry of Carbon Compounds: selected homologous series, isomerism, the typical reactions of each functional group, inter-conversions, and important organic substances.
- Patterns in the Chemical World: periodic variation from Li to Ar, the oxides of the elements from Na to Cl, and the general properties of transition metals.
What is the Elective Part?
The Elective Part offers three units, and a school teaches two of them, so the pair a candidate actually sits depends on their school’s arrangement rather than a fixed national list:
- Industrial Chemistry: industrial processes and why they matter, rate equations, activation energy, catalysis, and green chemistry.
- Materials Chemistry: natural and synthetic polymers, plastics, metals and alloys, modern synthetic materials, and green chemistry.
- Analytical Chemistry: detecting chemical species, separation and purification, quantitative analysis, instrumental methods, and what analysis gives society.
Because a student cannot know in advance which two electives their school will teach, a revision resource that only covers one or two units leaves a gap. Covering all three means the material lines up with whichever pair a given school has chosen.
How is HKDSE Chemistry graded if there is no pass mark?
Through the same standards-referenced system used across all DSE subjects. Rather than fixing a score threshold before the exam is sat, examiners review the marked scripts each year and set the mark ranges for Level 1 through Level 5** based on the demonstrated quality of work at each level. That is why the level boundaries can shift slightly from year to year, and why there is no single “pass mark” number a study guide can responsibly quote.
How can I revise for HKDSE Chemistry without a fixed target to aim for?
Since there is no official pass mark to drill toward, the most useful thing a revision tool can do is cover the full breadth of both the Compulsory Part and all three Elective units, so nothing is missed regardless of which electives a school teaches. The RiverMap Learning DSE Chemistry app has 710 original practice questions and 370 flashcards across all fifteen topics, plus a one-page revision note for each topic, in English, Traditional Chinese, and Simplified Chinese with one-tap switching. Rather than simulate a pass/fail mock exam, it tracks topic-by-topic mastery so a student can see exactly which of the fifteen topics still needs work before the real exam.
Every question is original and written to align with the publicly available HKDSE Chemistry Curriculum and Assessment Guide (Secondary 4-6), never copied from a past paper, marking scheme, or textbook. The full curriculum guide is published by the Education Bureau at edb.gov.hk. This app is an independent revision aid, not affiliated with or endorsed by the HKEAA, the Education Bureau, or the Curriculum Development Council.