Jenny has a mixture of sand, sugar, common salt, and milk powder. she adds some water to the mixture. which of these can be separated easily from the mixture after adding water?

Sand

Sand can be separated easily from the mixture after adding water. Sand does not mix with water unlike sugar, common salt, and milk powder. Sand settles down like precipitates because it cannot float or dissolve like the others. Decantation technique can be used to separate sand from the mixture.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.