Scope: Pearson IAL Chemistry Topic 1–5 (WCH11). 6×6 modules / 24 nodes. Map labels use a single backslash before parentheses so KaTeX sees \( … \) (not \\(). Demos — Q: wording from past papers (English). 思路流 / Mark 为中文辅导。若本地缺 wch11_s23_ms_11.pdf 请自 Pearson 补档。

1. Topic 1 — Moles & amount
Mass from \(N\) molecules
Solution concentration (\(c\))
2. Topic 1 — Equations & counting
Ionic equations & spectators
Atoms in a sample (\(n\), \(L\))
3. Topic 1 — Gas & ppm
Gas volumes at r.t.p.
ppm \(\rightarrow\) percentage
4. Topic 2 — Atomic structure
Ions, \(Z\), \(m/z\) (MS)
Configurations & spin diagrams
5. Topic 2 — IE & ionic radius
First ionisation equation
Isoelectronic ionic radius
6. Topic 2/3 — Sub-shell & lattice
Sub-shell counts (e.g. Mn)
Ionic lattice & giant vs simple
Edexcel IAL Chemistry
Unit 1 (WCH11)
Structure, Bonding & Intro Organic
Topic 1–5
7. Topic 3 — Shape & VSEPR
Linear \(\mathrm{CO_2}\) & bond polarity
Bond angles (\(\mathrm{BCl_3}\), \(\mathrm{NH_4^+}\), \(\mathrm{OF_2}\))
8. Topic 4 — Alkanes
Hydrocarbon definition & isomers
Radical propagation step
9. Topic 4 — Fuels & environment
Hazard vs risk
Pollutants / combustion products
10. Topic 5 — Fission & stereochemistry
Heterolytic vs homolytic (context)
\(E\)/\(Z\) naming & limonene
11. Topic 5 — Polymers & tests
Poly(ethene) (true / false)
Hydrocarbon + bromine water
12. Topic 1 — Atom economy & IE
Atom economy (% by mass)
Second ionisation of Mg