Free practice · 2022–2026
4,087 original past-paper questions and language tasks across 14 subjects. Choose a topic and read each question right here, with screen-friendly wording and its original equations and diagrams. Rarity shows how often its question type was found in the last five exam years—not how difficult it is.
4,087 matching entries · showing 673–696. Mixed questions appear in every relevant topic filter, but are counted once.
National 5 Chemistry
Section1 · Section 1
PDF page 2 · check any continuation
Moles, masses and reaction quantities · Acids, bases, salts and pH
Convert to amounts of substance and use the balanced-equation ratio.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 3 · check any continuation
Experimental design and chemical observations · Gas-volume calculations · 2 more skills
Connect practical decisions and observations to the purpose of the investigation.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 8 · check any continuation
Reaction rates and collision theory · Acids, bases, salts and pH
Link a rate change to successful collision frequency or activation energy.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 9 · check any continuation
Periodic trends · Acids, bases, salts and pH
Explain a trend using nuclear charge, shielding and attraction.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 6–7 · check any continuation
Atomic structure, isotopes and ions · Moles, masses and reaction quantities · 1 more skills
Use particle numbers and electron arrangements to explain chemical behaviour.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 8–9 · check any continuation
Formulae and balanced equations · Moles, masses and reaction quantities · 3 more skills
Use valencies or the stated species, then conserve atoms and charge.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 10–11 · check any continuation
Gas-volume calculations · Formulae and balanced equations · 3 more skills
Use the stated molar volume and the stoichiometric ratio.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF page 16 · check any continuation
Acids, bases, salts and pH · Open-ended chemical reasoning
Apply acid-base chemistry to equations, properties or measurements.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 17–18 · check any continuation
Representing molecular structures · Formulae and balanced equations · 1 more skills
Translate between structural representations while preserving bonds and functional groups.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 20–21 · check any continuation
Atomic structure, isotopes and ions · Experimental design and chemical observations · 1 more skills
Use particle numbers and electron arrangements to explain chemical behaviour.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 22–25 · check any continuation
Experimental design and chemical observations · Electrochemical cells and electrolysis · 3 more skills
Connect practical decisions and observations to the purpose of the investigation.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 26–28 · check any continuation
Representing molecular structures · Moles, masses and reaction quantities · 5 more skills
Translate between structural representations while preserving bonds and functional groups.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 29–31 · check any continuation
Experimental design and chemical observations · Redox and electron-transfer equations · 4 more skills
Connect practical decisions and observations to the purpose of the investigation.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF page 32 · check any continuation
Acids, bases, salts and pH · Open-ended chemical reasoning
Apply acid-base chemistry to equations, properties or measurements.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 2 · check any continuation
Moles, masses and reaction quantities · Acids, bases, salts and pH
Convert to amounts of substance and use the balanced-equation ratio.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 2 · check any continuation
Moles, masses and reaction quantities · Bonding, structure and properties
Convert to amounts of substance and use the balanced-equation ratio.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 3 · check any continuation
Reaction rates and collision theory · Acids, bases, salts and pH · 1 more skills
Link a rate change to successful collision frequency or activation energy.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 3 · check any continuation
Moles, masses and reaction quantities · Acids, bases, salts and pH
Convert to amounts of substance and use the balanced-equation ratio.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 4 · check any continuation
Formulae and balanced equations · Hydrocarbons, naming and isomers
Use valencies or the stated species, then conserve atoms and charge.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 5 · check any continuation
Representing molecular structures · Formulae and balanced equations · 1 more skills
Translate between structural representations while preserving bonds and functional groups.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 6 · check any continuation
Representing molecular structures · Formulae and balanced equations
Translate between structural representations while preserving bonds and functional groups.
Published marking linked · general strategy, not a model answer
Section1 · Section 1
PDF page 10 · check any continuation
Experimental design and chemical observations · Acids, bases, salts and pH · 1 more skills
Connect practical decisions and observations to the purpose of the investigation.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 6–7 · check any continuation
Experimental design and chemical observations · Gas-volume calculations · 3 more skills
Connect practical decisions and observations to the purpose of the investigation.
Published marking linked · general strategy, not a model answer
Section2 · Section 2
PDF pages 8–9 · check any continuation
Atomic structure, isotopes and ions · Moles, masses and reaction quantities · 1 more skills
Use particle numbers and electron arrangements to explain chemical behaviour.
Published marking linked · general strategy, not a model answer
4,087 numbered questions or named language tasks across 250 source PDFs in this subject/level selection. Repeated copies of the same extracted question are grouped once. 116 entries still need topic classification. Optional essay and text choices are included; these counts are not the number you must answer in an exam.
Question anchors and printed allocations are extracted from SHA-256-verified source PDFs. Optional alternatives are not added together. Applicable all-question paper totals are reconciled with the printed rubric; mismatches withhold automatic mark totals. A first written-answer marking row is never treated as a whole-question total. Exact marking pages require a section-matched table anchor or a wording- and digest-checked source pair. Topic headings are conservative rule matches and provisional, not independently reviewed or proof of current syllabus coverage. Original questions, diagrams, passages and official answers are not republished in this metadata index. Checked original question pages are rendered on demand in the website without rewriting their wording or diagrams. Scans, extraction gaps and uncertain marks remain visible rather than filled with invented content. Source audit: 2026-10-21. Question index: 2026-10-23. There were no ordinary exam sittings in 2020 or 2021. This is not a claim that every question has been independently checked or that scanned papers are fully indexed.
1 entries indexed; numbering or extraction still needs checking. Read the complete source for anything not listed.
The extracted allocations total 30, but the applicable printed total is 90. Automatic question totals are withheld for this source.
1 entries indexed; numbering or extraction still needs checking. Read the complete source for anything not listed.
The extracted allocations total 30, but the applicable printed total is 90. Automatic question totals are withheld for this source.
4 entries indexed; numbering or extraction still needs checking. Read the complete source for anything not listed.
The extracted allocations total 60, but the applicable printed total is 90. Automatic question totals are withheld for this source.
11 entries indexed; numbering or extraction still needs checking. Read the complete source for anything not listed.
The extracted allocations total 92, but the applicable printed total is 100. Automatic question totals are withheld for this source.