Question

part a
which of the following is a heterogeneous mixture?
vinegar
sugar water
air
raisin bran
none of the above

Explanation:

A heterogeneous mixture has visibly different parts. Vinegar is a solution of acetic - acid in water (homogeneous). Sugar water is a sugar - water solution (homogeneous). Air is a homogeneous mixture of gases. Raisin bran has visible raisins and bran flakes, making it a heterogeneous mixture.

Answer:

D. raisin bran