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  • Thermochemistry
  • Energy is stored between the bonds of an atom in molecules. It is potential energy for it has not yet been released.
  • Atoms and molecules have kinetic energy so they are always in motion. Energy is transferred between the system and surroundings by the collision of molecules. 
  • During a chemical reaction, activation energy is absorbed in order to break the existing chemical bonds. Energy is always released from a chemical reaction as the new bonds form.
  • A spark ignites the gasoline,  immediately burning the fuel and producing energy to power the car. 
  • Gasoline
  • H20 +  MgSO4
  • If the bonds of the reactants contain more energy than the bonds of the products, the reaction will release energy (Exothermic, -heat). It will get warm.
  • The chemical reaction is exothermic because it's losing energy.
  • If the bonds of the reactants contain less energy than the bonds of the products, the reaction will absorb energy (Endothermic, +heat). It will get cold.
  • The chemical reaction is endothermic because energy is absorbed by the system.
  • H20 +  NH4NO3
  •  The potential energy in the bonds of the products depends on the reaction. If it is an exothermic reaction, the product releases the energy and loses it. If it is an endothermic reaction, the product absorbs the energy and gains it.
  • Regardless of the chemical reaction, the total energy of the systems and surroundings does not change.
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