Question

Lithium floats an water while sodium
floats and catches fire when put in
water.​

Answer 1

The metal floats on the water and reacts with it, giving off Hydrogen gas. The heat given out by the reaction is produced so quickly that the Hydrogen gas catches fire, it burns with a lilac flame !

Answer 2

Answer:

Now let's see another reaction of the alkali metals, the reaction with water. We'll start with Lithium. The metal floats on the water and reacts with it, giving off Hydrogen gas. ... The heat given out by the reaction is produced so quickly that the Hydrogen gas catches fire, it burns with a lilac flame.

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