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chemical reactions - Coggle Diagram
chemical reactions
corrosion reactions
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most corrosion reactions happen slowly, over days and weeks rather than seconds or minutes
types:
IRON
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When iron reacts with water or oxygen. The oxygen comes from air and the water may come as vapour in the air, or even as liquid
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Rust forms on the surface of iron, an d is SOFT, CRUMBLY, and EASILY COMES OFF, which exposes more iron to rust.
COPPER
Copper reacts with SUBSTANCES IN AIR, like carbon dioxide
produces GREEN COMPOUNDS, eg: copper carbonate, COVER SURFACE OF COPPER, DO NOT EASILY COME OFF which keeps underneath copper safe from corroding
SILVER
Silver doesn't react with water or oxygen at room temp., but in POLLUTED AIR, containing HYDROGEN SULFIDE, it reacts to produce SILVER SULFIDE, a BLACK compound
PREVENTIONS
1- can keep oxygen, water, or other reactants away from metals
2- apply a coating of PAINT (like on cars), OIL OR GREASEE (in englines), or ANOTHER METAL (like zinc, on iron buckets)
in this, the coating, the metal, reacts with the reactants, instead of the metal underneath, and does not come off
SOME METALS ARE ~SUPERIOR~ (they dont react, like wow they're so useful)
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tin reacts with water. a thin layer o tin oxide is formed on the surface of tin, when it reacts with oxygen in the air, protecting the tin underneath it. The tin oxide doesn't react with air or water, which is why the underneath tin is protected. TIN + OXYGEN -> TIN OXIDE
Aluminium is like tin. Aliminium oxide is formed on the surface, and protects the metal under it as it doesn't react with other substances.
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combustion reactions
magnesium
heating of magnesium produces a bright white flame, and the product is a white ash
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carbon
when reacts with oxygen, glows red, mass decreases
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keywords: chemical reactions, reactants, substances, products, salt