Question

laura is separating a mixture of sand and water by decanting. she lets the sand all settle to the bottom of the container and then slowly pours the water into a new, clean container. this leaves all the sand behind in the bottom of first container. why is decanting an effective method of separation for water and sand? a. water and sand have different densities. b. water and sand have different colors. c. water and sand are both pure substances. d. water and sand have similar properties.

Explanation:

Decanting works for separating water - sand mixture because sand, being denser, settles at the bottom and water can be carefully poured off.

Answer:

A. Water and sand have different densities.