Answer:
Iodine
Explanation:
fluorine is the most reactive
B is the answer glad to help
Answer: Last option (total energy always remains constant)
Explanation:
The Law of Conservation basically states that energy cannot be created or destroyed. Only changed from one form to another (potential, kinetic, chemical, etc.) so it makes sense that the net energy is unchanging.
Answer:
Friction
Explanation:
<em>Friction causes heat because it forces particles to move at a quicker speed and gain more energy.</em>