I love chemistry this week. This week we are learning thermochemistry. and there are these two ways of saying stuff. if you gain heat its called endothermic. when you lose heat it is exothermic. and when we did some labs we had to find if it was endothermic or exothermic. so we abbreviate it. endothermic is 'endo' and exothermic is.......'exo'. i love thermochemistry.