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Rust
4Fe (s) + 3O2 + 4H2O → 2Fe2O32H2O
iron + oxygen + water → hydrated iron(III) oxide
metal + water
metal hydroxide + hydrogen
i.e
2K + 2H2O → 2KOH + H2
metal + oxygen
metal oxide
i.e
4K + O2 → 2K2O
metal + acid
metal salt + hydrogen
i.e
Mg + H2SO4 → Mg2SO4 + H2
metal + steam
metal oxide + hydrogen
i.e
Mg + H2O (g) → MgO + H2