Very active metals which are on top of the electro-chemical series like sodium can react with water to release hydrogen.
A metal oxide reacts with water to produce a metal hydroxide.
Potassium is the metal that reacts most vigorously with water at 25C.
The metal that reacts slowly with cold water to form a hydroxide is magnesium. When magnesium reacts with water, it forms magnesium hydroxide and hydrogen gas.
When an alkali metal reacts with water, it produces an alkali metal hydroxide and hydrogen gas. This is a highly exothermic reaction, with the alkali metal displacing hydrogen from the water molecule.
Zinc is a grey metal that can react with water, although it does so slowly. When zinc reacts with water, it produces zinc hydroxide and hydrogen gas.
A corresponding metal salt and water are produced.
Metal hydroxide + hydrogen gas
Water
copper
Sodium is a metal that reacts violently with water, sometimes bursting into flames. The reaction produces sodium hydroxide and hydrogen gas.
When a metal reacts with water, it can produce metal hydroxide and hydrogen gas. The metal hydroxide is a basic compound that dissolves in water to form a basic solution, while the hydrogen gas is released as a byproduct of the reaction.
When a metal oxide reacts with water, it forms a metal hydroxide. This reaction typically involves the metal oxide releasing hydroxide ions when it reacts with water molecules. Metal hydroxides are basic compounds that can dissociate in water to form metal cations and hydroxide anions.