Which of these sentences is in the first-person point of view? A
We know all about the surprise party.

B
You turn 15 this October.

C
They keep mentioning your birthday.

D
He piles the birthday presents under his bed.

Cause of he different elevations  hope this ?

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen