Question

characteristics of matter that can be seen through direct observation such as density, melting point, and boiling point are called what....

Answer 1

Hmm.

Well, they're all properties of matter.

Those are physical proportions (e.g., physical changes.), since you still have the same product, just in a different form.

Answer 2

Breannlynn, post this question to the Chemistry section as opposed to the Feedback section. You will have much better luck finding an answer there.