Question

question 7. a science student prepares a mixture of water and sand in a beaker. after leaving the mixture undisturbed for a few minutes, the sand settles to the bottom. the student carefully tilts the beaker and pours the clear water into another container, leaving the sand behind.
filtration
decantation
chromatography
distillation

Explanation:

Filtration involves passing a mixture through a filter medium. Chromatography separates components based on their different affinities for a stationary and mobile phase. Distillation separates based on differences in boiling - points. Decantation is the process of carefully pouring off a liquid layer from a solid - liquid mixture without disturbing the solid at the bottom. The student's action of pouring off clear water leaving sand behind is decantation.

Answer:

B. Decantation