Which actions represent endothermic reactions? check all that apply. an instant ice pack becoming cold, splitting a gas molecule, baking bread, tnt exploding, wood burning in a fire

Answer is: an instant ice pack becoming cold, splitting a gas molecule and baking bread.

Endothermic reaction is chemical reaction that absorbs more energy than it releases.
In ice pack, reaction absorbs heat from the surroundings (endothermic reaction), lowering the surrounding temperature.
For splitting molecule and baking bread we must add energy to break bonds between atoms.

The chemical bubbles