Question

the piece of______floats on the surface of the water with “hissing” sound ​

Answer 1

Answer:

Sodium is the answer

Explanation:

Answer 2

The piece of sodium floats on the surface of the water with “hissing”

sound .

Explanation:

Sodium reacts with water and form Hydrogen gas ;

$\[2Na + 2{H_2}O \to 2NaOH + {H_2}\]$

The hydrogen gas in above chemical equation produced hissing sound.

Therefore,

The piece of sodium floats on the surface of the water with “hissing”

sound .