Here's why:
* Alkali metals are highly reactive metals located in Group 1 of the periodic table (Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium).
* They have a strong tendency to lose their single valence electron, making them excellent reducing agents.
* When alkali metals react with water, they displace hydrogen from water molecules, forming hydrogen gas and a metal hydroxide.
Here's a general equation for the reaction:
2M + 2H₂O → 2MOH + H₂
Where:
* M represents an alkali metal.
* MOH represents the metal hydroxide.
Example:
* Sodium (Na) reacting with water:
2Na + 2H₂O → 2NaOH + H₂
This reaction is highly exothermic, meaning it releases a lot of heat, which can even cause the hydrogen gas to ignite.
Note: Other metals like calcium, magnesium, and zinc also react with water to produce hydrogen gas, but they require specific conditions, such as heating or steam.
