Because they decompose the water to pure hydrogen and oxygen. The hydrogen is a flammable gas and the oxygen is the oxidizing agent that reacts together in an explosive manner.
Caesium
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.
Alkali Metal + Water ------> Alkali Hydroxide + Hydrogen Alkali Metal Oxide + Water ------> Alkali Hydroxide + Water Example: ================ Sodium + Water ------> Sodium Hydroxide + Hydrogen 2 Na + 2 H2O --------> 2 NaOH + H2
Improve Alkali Metal + Water ------> Alkali Hydroxide + Hydrogen Alkali Metal Oxide + Water ------> Alkali Hydroxide + Water
The pH of water changes after a reaction with an alkali metal because the metal reacts with water to produce hydroxide ions, increasing the concentration of hydroxide ions in the solution and making it more basic. This leads to a shift in the pH towards the alkaline side of the pH scale.
Alkali metals reacts violently with water forming a hydroxide and hydrogen; alkali earth metals react with water but no so violent.Other metals doesn't generally react with water at room temperature.
Pick one. They all do it, and the farther down the period you go the more violently it'll explode.
Potassium is the only metal (alkali metal) where a flame is present. Lithium and sodium fizz but there is no flame. Caesium, francium and rubidium all explode on contact with water.
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.
No, an alkali is a type of metal.
Silver wouldn't explode at all in water! Unless it were the alkali/alkaline earth metals they would.
Alkali metals explode in water because they react violently with the water, releasing hydrogen gas and heat. This reaction is highly exothermic and can lead to an explosion due to the rapid release of energy.
Alkali Metal + Water ------> Alkali Hydroxide + Hydrogen Alkali Metal Oxide + Water ------> Alkali Hydroxide + Water Example: ================ Sodium + Water ------> Sodium Hydroxide + Hydrogen 2 Na + 2 H2O --------> 2 NaOH + H2
Yes, francium is a highly reactive alkali metal and will react vigorously with water, producing hydrogen gas and heat. Due to its extreme rarity and radioactivity, the actual observation of francium reacting with water has not been extensively documented.
Improve Alkali Metal + Water ------> Alkali Hydroxide + Hydrogen Alkali Metal Oxide + Water ------> Alkali Hydroxide + Water
Potassium is a reactive metal, an alkali metal, placed in the group 1 of the periodic table, is soft, has a natural radioactive isotope, easily react with water and halogens, etc. The symbol is K.
group 1 or alkali metals
The pH of water changes after a reaction with an alkali metal because the metal reacts with water to produce hydroxide ions, increasing the concentration of hydroxide ions in the solution and making it more basic. This leads to a shift in the pH towards the alkaline side of the pH scale.