The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat.
Answer:

Explanation:
number of moles of C8H9NO2 = 
The trick is to remember to convert milligrams to grams because molar mass is normally presented in grams per mole
I THINK that that is true. It's just weathering the rock down not change composition. Lemme know if you get it right please! (:
Answer:
2.
Explanation:
This should be right hopefully it is!
<span>a. x and y are atoms of the same element.
If both atoms contain the same amount of protons, they are always the same element.
</span>