<span>In a chemical change, the molecular structure of a substance changes. I think this is right. I hope this helps.</span>
Answer: D.kinectic energy
Explanation
x=3
Use the pythagorean theorem:
a^2 + b^2 = c^2
4^2 + x^2 = 5^2
16 + x^2 = 25
x^2 = 25-16
x^2 = 9
√x^2 = √9
x = 3
1:1
Fe has a charge of 2+ while O has a charge of 2-.
Formula: FeO
Since the atomic mass consists of protons and neutrons, that would be the answer.
Answer: <span>C. the atomic mass </span>
