Question

Is water freezing to ice endothermic or exothermic? Natural gas burning?

Answer 1

1=endothermic

2=exothermic

Answer 2

Exothermic - when you burn something, it feels hot to you because it is giving off heat into the surroundings. Exothermic - think of ice forming in your freezer instead. You put water into the freezer, which takes heat out of the water, to get it to freeze