Which mixture will separate quickly when left uncovered out in the open?

A. Air
B. Cola
C. Concrete
D. Seawater

Cola in the open loses its dissolved carbon dioxide.

cola

excape

The mixture that will separate quickly when left uncovered out in the open is B. Cola.

Explanation: When cola is left open, it will gradually lose its dissolved carbon dioxide (CO2) gas. Cola contains carbonation, which is created by dissolving carbon dioxide under pressure. When the pressure is released, such as when opening the bottle or can, the carbon dioxide begins to escape from the liquid. As a result, the cola will become flat and lose its fizz.

This process of carbon dioxide escaping from the liquid is known as degassing or outgassing. It occurs because the solubility of gases, such as carbon dioxide, decreases as the temperature increases or the pressure decreases. When the cola is left uncovered out in the open, the pressure decreases, allowing the carbon dioxide gas to escape more rapidly.

Therefore, cola will separate quickly when left uncovered out in the open due to the loss of dissolved carbon dioxide gas.