Edexcel IAL Chemistry U1R June 2026 Paper Walkthrough_Section A

Walkthrough of Edexcel IAL Chemistry Unit 1R (June 2026) Section A, step-by-step method on screen with spoken explanation. Each question: key idea → working → answer. Built for revision and exam technique, not just final letters. Topics covered • Atomic orbitals & maximum electrons • Carbon neutrality • Fractional distillation & chain length • Cracking vs reforming • Acid rain (NOx / SOx) • Dot-and-cross diagram (CO) • Free-radical substitution (propagation) • Electrical conductivity (ionic vs metallic) • Electron density maps • Ionic bond strength & polarising power • Atom economy & Fe extraction calculations • Solution concentration (Cl⁻) • Alkene → diol (acidified KMnO₄) • Hazard vs risk • Graphene vs graphite • ppm by mass (fluoride)