Experiment 4.2 - Chemistry Form 4
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Experiment 4.2 - Chemistry Form 4

To determine the reactivity trend of Group 17 (chlorine, bromine, iodine).

Here’s a clear and engaging post about based on the typical Malaysian SPM curriculum (KSSM). The experiment usually focuses on Periodic Table – Reactivity of Group 1 (Alkali Metals) or Group 17 (Halogens) .

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.

Wear goggles & use small pieces only. Potassium reacts violently!

| Halogen \ Halide | KCl | KBr | KI | |----------------|-----|-----|-----| | Chlorine water | No reaction | Turns orange (Br₂) | Turns brown (I₂) | | Bromine water | No reaction | No reaction | Turns brown (I₂) | | Iodine water | No reaction | No reaction | No reaction |

Cl₂(aq) + 2KBr(aq) → 2KCl(aq) + Br₂(aq)

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!

#ChemistryForm4 #Experiment4_2 #Halogens #DisplacementReaction #SPM

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

To investigate the reactivity of Group 1 elements (Li, Na, K) with water & oxygen.

#ChemistryForm4 #Experiment4_2 #Group1Reactivity #SPMChemistry #AlkaliMetals 🧪 Chemistry Form 4: Experiment 4.2 – Halogen Displacement Reactions Which halogen is the strongest oxidising agent?