“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.
The solution turned from vibrant blue to a pale, cloudy colourless. The reddish-brown solid was pure, elemental copper. Zinc was the hero. chemistry form 4 experiment 5.1
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.” “Don’t be a hero yet,” Lin warned, pouring
Later, as they washed the test tubes, Ravi looked at the reddish-brown copper residue stuck to the glass. “It’s like a chemical war,” he said. “The strong kick the weak out of their homes.” The reddish-brown solid was pure, elemental copper
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.
Maya, the cautious one, read the steps aloud. “First, we label four test tubes. One is the control.”