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When a metal oxide reacts with an acid a slat and water are formed.
When a hydrocarbon burns, it reacts with oxygen to form carob dioxide and water vapor. As both of these are gasses, they wil drift away. When a metal react with oxygen, it forms a metal oxide, and metal oxides are solid.
Sulfuric acid, smog, and the CO2 in the water reacts with those.
copper
rust
Hydrogen
Water
Metal hydroxide + hydrogen gas
I had the same quesiton on a worksheet in my Chemistry class .... "Which metal reacts quickly with when water when it is finely powdered?" The answer is Magnesium .
A corresponding metal salt and water are produced.
The oxygen in the water reacts with the metal in the nail - forming metal oxide (rust)
A cation is formed.