Question

Назовите щелочные металлы, которые, реагируя с водой, плавают на её поверхности и не тонут. Дайте объяснение этому явлению.

Answer 1

Литий, натрий и калий легче воды и плавают на её поверхности, реагируя с ней.( выделяется водород)

Answer 2

Alkali Metals Reacting with Water

The alkali metals that react with water and float on its surface without sinking are lithium (Li), sodium (Na), and potassium (K).

This phenomenon occurs due to the low density of these alkali metals compared to water. When these metals react with water, they produce hydrogen gas, which forms bubbles. These bubbles of hydrogen gas adhere to the surface of the metal, reducing its overall density and causing it to float.

This can be explained by the principle of buoyancy, which states that an object will float if it is less dense than the fluid it is placed in. In the case of alkali metals reacting with water, the hydrogen bubbles formed during the reaction decrease the overall density of the metal, allowing it to float on the water's surface.

Cited Sources

- Source "The alkali metals that react with water and float on its surface without sinking are lithium (Li), sodium (Na), and potassium (K)." - Source "This phenomenon occurs due to the low density of these alkali metals compared to water. When these metals react with water, they produce hydrogen gas, which forms bubbles. These bubbles of hydrogen gas adhere to the surface of the metal, reducing its overall density and causing it to float."

I hope this explanation helps! If you have any more questions or need further clarification, feel free to ask.