Endothermic and Exothermic

energy is going both in and out: determine to what extent

Endothermic:

• Energy in > energy out

• Absorbs energy; surroundings are colder

• The system gains energy, surroundings lose it

• Energy is a reactant
  

  

Exothermic:

• Energy out > energy in

• Emits energy; surroundings are warmer

• The surroundings gain energy, system loses it

• Energy is a product