Answer:
The are 10 electrons in nitride
X is usually representing time so years, days, etc
Answer:
The answer is "
".
Explanation:
calculating the moles in
Eqution:

Calculating the amount of
produced:

So, the amount of dihydrogen produced = 
Answer: It becomes the uncombined element in the product.
Explanation:
The reaction between Zn and HCl is a single displacement reaction according to equation below
Zn + 2HCl —> ZnCl2 + H2
Zn displaces H2 from acid and in the product, hydrogen became the uncombined element.
I think it’s B vibrations in molecules
Explanation: The Kinetic Theory of Matter states that matter is composed of a large number of small particles—individual atoms or molecules—that are in constant motion.