Question

exothermic reaction: a chemical thermal energy is the products will usually feel the products will have than the reactants. more chemical bonds are being in the products than being in the reactants. examples: precipitation, cubes, fireworks, freezing graphing thermal energy endothermic reactions: heat is into the system from the exothermic reactions: heat is to the surroundings from the model exothermic reaction surroundings system (reactants) e_system decreases (generally heat flow) system boundary surroundings model endothermic reaction surroundings system (reactants) e_system increases (generally heat flow) system boundary surroundings energy released = temperature increases! energy absorbed = temperature decreases!

Explanation:

Exothermic reactions release thermal energy, making the surroundings feel hot. Products have lower energy than reactants and more bonds are formed in products. Examples include precipitation, melting of ice - cubes in reverse (freezing), fireworks. In endothermic reactions, heat is absorbed into the system from the surroundings. In exothermic reactions, heat is released to the surroundings from the system.

Answer:

Exothermic Reaction: a chemical reaction in which thermal energy is released. The products will usually feel hot. The products will have lower energy than the reactants. More chemical bonds are being formed in the products than being broken in the reactants. Examples: Precipitation, freezing cubes, fireworks.
Graphing Thermal Energy - Endothermic Reactions: Heat is absorbed into the system from the surroundings.
Exothermic Reactions: Heat is released to the surroundings from the system.