Experiment 4.2 Chemistry Form 4 May 2026

2M(s) + 2H₂O(l) → 2MOH(aq) + H₂(g) (Alkali metal + water → metal hydroxide + hydrogen)

Reactivity decreases down Group 17: Cl > Br > I Chlorine can displace bromine & iodine; bromine can displace iodine only. experiment 4.2 chemistry form 4

Wear goggles & use small pieces only. Potassium reacts violently! 2M(s) + 2H₂O(l) → 2MOH(aq) + H₂(g) (Alkali

I’ve written two versions: one for (most common) and one for Group 17 . Choose the one that fits your syllabus. Option 1: Experiment 4.2 – Reactivity of Group 1 Elements (Alkali Metals) 🧪 Chemistry Form 4: Experiment 4.2 – How Reactive Are Group 1 Elements? Lithium, Sodium & Potassium – let’s see them in action! experiment 4.2 chemistry form 4

Halogens are toxic & corrosive – work in a fume hood or well-ventilated area.