Answer:
exothermic reaction
when compounds dissolve they produce heat hence a chemical reaction that produces heat is known as endothermic reaction.
Isometry, or I think you mean Isometric or Anisometric, is two molecular entities that are superposable or can be made superposable by reflection of one of them in a mirror.
A: Natural Gas
They do this because Natural gas does not have a smell, so you wouldn't know if it was in the air. So they give it a distinct foul smell, so you know if there is a gas leak.
The answer should be metallic
Agreed with the person on top ^^^
