What happens to powders in a mixture if it is not stirred?

When a mixture containing powders is not stirred, the powders tend to settle out of water due to the effects of gravity. This settling occurs because the powders are typically denser than water and lack the agitation needed to keep them suspended in the liquid. As a result, over time, the heavier particles will accumulate at the bottom of the container, leading to a separation between the solid powder and the liquid component.

This phenomenon is commonly observed in mixtures such as sand in water or flour in water, where without stirring, the solid particles will clump and eventually settle. The other options do not accurately describe what occurs when powders are left undisturbed in a mixture. Powders do not remain suspended indefinitely without stirring, nor do they completely dissolve without adequate mixing. Additionally, there is no inherent change in the chemical composition of the powders simply due to being left unstirred, as they retain their original characteristics unless acted upon by a chemical agent or reaction.