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Physical Quantities, Units and Measurement
Use SI units, instruments, data, graphs, and uncertainty within the Combined Science component scope.
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Choose a science, then open the chapter you need. These notes follow the 2027 K326 Combined Science syllabus.
Last updated: 2026-07-16
Sitting the exam in 2027? Use K326. Sitting in 2026? Keep using the current 5086 syllabus and your school materials.
K326 uses Paper 2 for Physics, Paper 3 for Chemistry, and Paper 5 for practical work drawn from both components. Confirm current details in the official master syllabus.
Combined Physics has 16 top-level topics. It groups and narrows the 20-topic K323 Pure Physics map, so a Pure Physics checklist is not a safe substitute.
01
1
Use SI units, instruments, data, graphs, and uncertainty within the Combined Science component scope.
2
Connect speed, velocity, acceleration, distance-time graphs, and speed-time graphs within one-direction motion.
3
Keep mass, weight, density, force, contact area, and pressure distinct before choosing a relationship.
4
Use resultant force and motion reasoning from a clear force model.
5
Use moments, perpendicular distance, equilibrium, and centre of gravity within component scope.
6
Track energy stores and transfers, then calculate work, kinetic energy, gravitational potential energy, and power.
7
Explain states, temperature, internal energy, and phase changes using particle spacing, motion, and forces.
8
Explain conduction, convection, radiation, and the dominant transfer path in context.
9
Use wave quantities, transverse and longitudinal models, sound, and echo reasoning.
10
Compare spectrum regions, uses, and hazards through frequency and interaction.
11
Use ray diagrams and the required reflection, refraction, refractive-index, and converging-lens ideas.
12
Separate static charge from current and relate charge flow, potential difference, and resistance.
13
Apply symbols, measurements, series and parallel rules, and equivalent resistance to labelled circuits.
14
Explain mains wiring, safety devices, power ratings, and energy use.
15
Connect magnet properties, induced magnetism, current-produced fields, and the motor effect.
16
Compare emissions, interpret half-life, and balance uses against exposure risk.
Combined Chemistry retains the 12 top-level labels but narrows the assessed outcomes. The reviewed 2027 component does not include the Pure Chemistry electrolysis outcomes.
01
1
Choose apparatus, gas collection, separations, chromatography comparisons, and purity evidence for the stated task.
2
Connect particle states and energy changes to atomic structure, nuclide notation, isotopes, and ion particle counts.
3
Connect ionic and covalent bonding to properties, then distinguish elements, compounds, mixtures, metals, and alloys.
02
4
Move between formulae, equations, moles, masses, gas volumes, limiting reactants, and concentration with ratios visible.
5
Use ions, pH, indicators, neutralisation, oxide classification, soil treatment, and ammonium-salt reactions.
6
Apply the official cation, anion, and gas tests through reagent, condition, observation, and inference.
7
Recognise oxidation and reduction through oxygen, hydrogen, electrons, oxidation states, and the named redox tests.
8
Use Groups 1, 17, and 18, the reactivity series, extraction, alloys, and rust prevention within Combined scope.
9
Classify exothermic and endothermic changes from energy transfer and experimental evidence.
10
Explain concentration, pressure, particle-size, and temperature effects through collisions and rate data.
03
11
Connect fuels, crude oil, cracking, alkanes, alkenes, alcohols, carboxylic acids, polyethene, and recycling.
12
Connect air composition, pollutant sources and effects, the carbon cycle, greenhouse gases, and consequences.
Official curriculum source: SEAB 2027 SEC G3 Science (Physics, Chemistry) K326 syllabus. Checked 15 July 2026. Recheck codes, outcomes and assessment details before annual updates.
The focus lines are Eclat revision guidance. They are not quoted syllabus text and do not replace the official learning outcomes.
This hub maps the official 2027 SEC G3 Science (Physics, Chemistry) K326 top-level topics. The linked SEAB syllabus remains authoritative for every assessable learning outcome and paper detail.
O-Level is still familiar reader language and 5086 is the 2026-and-earlier reference code. Students sitting in 2027 should use K326, while 2026 candidates must follow their current legacy syllabus and school instructions.
Only as a national comparison. IP schools control their own sequence, depth, and assessment scope, so IP students should use the separate IP route and follow current school materials first.