They convert chemical potential energy (stored in muscle cells) to kinetic energy (running)
Because chloride is more reactive than hydrogen.
The main pieces of evidence that an exothermic reaction has occurred is an increase in temperature due to the release of energy, a release of energy in the form of light, or a release of gas.
Answer: Bubbles, burning, odor, color change, and rusting.
Explanation: Chemical changes are changes to something that is irreversible.
