Answer: heat
Explanation: if solid ice is heated it becomes in liquid and then to gaseous steam.
1) Reaction is exothermic because energy of products is less than energy of reactants
2) Energy is released because the reaction is exothermic
3) 350
4) 150
5) 500-350=150
6) 350-150=200
Window cleaner is ammonia dissolved in water. This is an example of a _______.