Which statement best describes chemical properties of matter?

A: Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
B: Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
C: Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.
D: Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

for e d g e n u i t y ppl its: C: Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Which statement best describes chemical properties of matter?

D: Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

I think that it shouold be D.

answer and explanation;

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.