Name two metals which react violently with cold eater. Write any three observations you would make when such a metal is dropped into water.
Sodium and potassium are two metals that react violently with cold water.
Three observations when such a metal is dropped in water are:
- Reaction is highly exothermic i.e. a huge amount of heat is produced.
- Hydrogen gas is evolved in the reaction.
- A small explosion takes place because the heat produced in the reaction burns the hydrogen gas. Hydrogen can be identified by the 'pop' sound it makes while burning.