Question

which of the following do water (h₂o), rust (fe₂o₃), and salt (nacl) have in common? a water, rust, and salt are elements b water, rust, and salt are heterogeneous mixtures c water, rust, and salt are homogeneous mixtures d water, rust, and salt are compounds

Explanation:

Water ($H_2O$), rust ($Fe_2O_3$), and salt ($NaCl$) are not elements. They are compounds made up of different elements. A homogeneous mixture has uniform composition throughout, and a heterogeneous mixture has non - uniform composition. Water, rust, and salt are compounds, not mixtures or elements.

Answer:

A. water, rust, and salt are elements - Incorrect
B. water, rust, and salt are heterogeneous mixtures - Incorrect
C. water, rust, and salt are homogeneous mixtures - Incorrect
D. water, rust, and salt are compounds - Correct
So the answer is D.