Answer:
Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water.
It has 49 electrons as well. The amount of protons and electrons are equal.
Number #2 is joule
In the SI system the unit of heat is the joule. The calorie was defined so that the heat capacity of water was equal to one.The heat capacity of a substance is the amount of heat required to raise the temperature of a defined amount of pure substances by one degree.
Number #3 is Endothermic
Why? I can't explain. I Just left class where they were just explaining that.
The answer is D) n2, hope this helped!!