In 1839, American inventor Charles Goodyear had spent years unsuccessfully trying to make rubber less sticky and more heat-resistant. What finally led him to discover vulcanization, the process that made durable rubber possible?
- He treated raw rubber with a chemical bleach that happened to alter its molecular structure, a discovery he stumbled onto while doing laundry
- He froze a rubber-and-sulfur mixture in ice to slow down a reaction he was trying to control, and noticed the frozen sample had become more elastic
- He accidentally dropped a rubber-and-sulfur mixture onto a hot stove, and the heat transformed the sticky compound into a firm, weatherproof material
- He deliberately baked increasingly larger batches of rubber and sulfur in an oven at rising temperatures until one careful trial produced the right texture
Why C? And why not the others?
Correct answer: C. He accidentally dropped a rubber-and-sulfur mixture onto a hot stove, and the heat transformed the sticky compound into a firm, weatherproof material
Vulcanization was discovered by accident: after years of failed attempts to stabilize rubber, Goodyear dropped a rubber-and-sulfur mixture onto a hot stove, and rather than melting or burning as he expected, the heat cross-linked the rubber's molecules into a durable material that stayed firm across a wide range of temperatures. The option describing a slow, deliberate oven-baking trial is wrong because it removes the defining accidental element of the story; the historical record credits a sudden mishap, not a controlled temperature-rising experiment. The option describing a chemical bleach encountered while doing laundry is wrong because bleach and laundering played no role in the discovery at all; it substitutes an unrelated invented anecdote. The option describing freezing the mixture in ice is wrong because cold, not heat, was the applied condition, and freezing is the opposite of the reaction that actually cross-linked the rubber and sulfur into a stable compound.
Source: Britannica: Charles Goodyear