Question

Which is not an example of a pure substance?

Answer 1

Answer:

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.

Answer 2

Answer:

it is milk

Explanation:

Milk is not a pure substance, it's a mixture. Pure substances are either elements or compounds. Milk is predominately a mixture of water, lactose,...