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Chemistry 5070

Cambridge O Levels · 12 sessions · 2019–2025

Chemistry notes →
Year
Session
SessionPaperQuestion paperMark scheme
May/June 2025Paper 1 · Variant 11QP ↓MS ↓
May/June 2025Paper 1 · Variant 12QP ↓MS ↓
May/June 2025Paper 1 · Variant 13QP ↓MS ↓
May/June 2025Paper 2 · Variant 21QP ↓MS ↓
May/June 2025Paper 2 · Variant 22QP ↓MS ↓
May/June 2025Paper 2 · Variant 23QP ↓MS ↓
May/June 2025Paper 4 · Variant 41QP ↓MS ↓
May/June 2025Paper 4 · Variant 42QP ↓MS ↓
May/June 2025Paper 4 · Variant 43QP ↓MS ↓

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Exam tips for Chemistry

  1. 01Reactivity series (K Na Ca Mg Al Zn Fe Sn Pb Cu Hg Ag Au) — memorise it.
  2. 02Ionic equations: remove spectator ions; include state symbols (aq, s, l, g).
  3. 03Electrolysis: cathode = reduction (gains e⁻); anode = oxidation (loses e⁻).
  4. 04Moles: n = m/Mᵣ, n = cV, n = V/24 at RTP — know all three.
  5. 05Organic: write structural formulae for alkanes/alkenes; know addition vs substitution reactions.