1. Carbon monoxide reduction iron oxide experiment
Principle: 3CO Fe2O3=3CO2 2Fe
Steps
Check device air tightness
Place iron oxide into the center of the glass tube
One pass: pass in CO gas first
Purpose: To discharge the air in the device - to prevent CO from mixing with air and causing an explosion.
Point 2: Light the alcohol blowtorch again
Three extinguishes: stop heating
Four stops: Stop passing CO after the glass tube cools down.
Purpose: To prevent the generated iron powder from being re-oxidized at higher temperatures
Prevent the backflow of lime water from exploding the test tube
Experimental phenomena
1. Reddish brown powder turns into black
2. The gas generated makes the clear lime water in the test tube turbid.
3. The exhaust gas burns to produce a blue flame
Protection of metal resources
Methods to prevent iron products from rusting
Principle: Make iron products isolate water or air
1. Keep the surface of iron products clean and dry
2. Cover the steel surface with a protective film
3. Use chemical methods to form a dense oxide film on the steel surface