Which is not an example of a pure substance? a. Table salt
b. Rust on a nail
c. Milk
d. Rubbing alcohol

Milk

Explanation:

Milk is what we call colloid.

A colloid is, basically, a substance that has a homegenous appereance in naked eye. But with some pressure on it or looking into a good microscope, we can see other particles, other pure substances.

In the case of milk, we have fat, proteins, water and a few other things.

Table salt, rubbing alcohol and Rust on a nail are all pure substances, because they have only one type of atoms arrangement, respectively:

NaCl - a "crystal" - , Fe(OH)³ - other "crystal" -, and C3H8O - who has a classic geometric form.

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

1/0.14nm = 10^10/1.4 a lot