KCSE Chemistry Paper 1 || 2026 Prediction Solved! (80/80)

Complete step-by-step walkthrough and official marking scheme for KCSE Chemistry Paper 1 (233/1) Theory Prediction Exam (80 Marks). Master key concepts including acid-base indicators, isotopes, carbon(II) oxide reduction of lead(II) oxide, hydrocarbon isomerism, qualitative analysis for zinc ions, paper chromatography, and coordinate (dative) bonding dot-and-cross diagrams to secure a full 80/80. TIMESTAMPS: 00:00 - Intro & Exam Overview 00:26 - Q1: Indicators & Acid Strength 01:24 - Q2: Isotopes & Mass Calculations 05:00 - Q5: Thermal Decomposition & Glass Wool Diffusion 06:40 - Q6: Hydrogen Sulphide Flowchart 07:25 - Q7: Carbon(II) Oxide Reduction of PbO 09:45 - Q9: Hydrocarbon Isomers (Butene) 18:35 - Q15: Paper Chromatography of Sugars 20:00 - Q16: Empirical & Molecular Formula 23:20 - Q19: Preparation of Dry HCl Gas 28:25 - Q22: Atomic Structure & Periodic Table 29:45 - Q23: Dot-and-Cross Bonding ($H_3O^+$ Dative Bond) 34:05 - Q27: Preparation of Nitrogen(IV) Oxide 34:50 - Q28: Electrochemical Cell Representation & Wrap-Up GET FULL REVISION GUIDES & ESSAYS HERE 👇 👉 https://selar.com/8282q8221e 🎁 FREE SAMPLE REVISION NOTES ON WHATSAPP: 👉 https://wa.link/j1w3u0 (or WhatsApp 0728354355) 📲 JOIN OUR LIVE ONLINE CLASSES: Weekly KCSE Revision Masterclasses on Google Meet | Call / WhatsApp: 0728354355 🔔 Subscribe for complete national school mock revisions, predictions, and official marking schemes! #KCSE #KCSEChemistry #ChemistryPaper1 #KCSE2026 #ChemistryRevision #MarkingScheme