Form 4 Experiment 5.1 - Chemistry

Lin dropped a small piece of copper wire into the blue liquid. They waited. One minute. Two. The copper sat at the bottom like a sleeping snake. The blue remained blue.

“Today,” she had announced, her voice crackling through the lab’s humid air, “you are all forensic chemists. A factory has spilled three different metals—magnesium, zinc, and copper—into a vat of copper(II) sulphate solution. Your job is to determine which metal is the ‘hero’ that reacts, and which are the ‘villains’ that remain inert.”

Ravi carefully dropped a few granules of zinc into the next tube. For a moment, nothing. Then, a miracle. The deep blue colour began to bleed away from the zinc, as if an invisible eraser was moving upwards. Simultaneously, a reddish-brown dust started to bloom on the surface of the zinc granules, like rust forming in fast-forward. chemistry form 4 experiment 5.1

Maya stood up, her voice steady. “Magnesium is the most reactive, then zinc, then copper. Because a more reactive metal will displace a less reactive metal from its salt solution.”

Lin nodded, swirling the last of the pale, colourless solution down the sink. “That’s not war,” she smiled. “That’s displacement. And now we know how to prove who belongs where.” Lin dropped a small piece of copper wire

It was a Thursday afternoon, and the Form 4 Science lab smelled of antiseptic and old wood. Maya, Lin, and Ravi huddled over their workstation, a neat row of four test tubes clamped to a metal stand. Their teacher, Puan Aishah, had given them a puzzle.

“Don’t be a hero yet,” Lin warned, pouring 2 cm³ of the deep, sapphire-blue copper(II) sulphate solution into each tube. The liquid was beautiful, like a piece of the ocean trapped in glass. “Today,” she had announced, her voice crackling through

The more reactive metal (magnesium or zinc) acts as the displacer, while the less reactive metal (copper) is displaced. The reactivity series is not just a list—it is a hierarchy of chemical power.