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Energy Changes in Chemical & Nuclear Systems

Learning Goals:  I will be able to explain the difference between exothermic and endothermic reaction.  I will be able to explain the difference between fission and fusion .  I will be able to explain the energy changes associated with physical/chemical/nuclear changes. .

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Energy Changes in Chemical & Nuclear Systems

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  1. Learning Goals:I will be able to explain the difference between exothermic and endothermic reaction.I will be able to explain the difference between fission and fusion. I will be able to explain the energy changes associated with physical/chemical/nuclear changes. Energy Changes in Chemical & Nuclear Systems

  2. Thermochemistry: • Energy • Heat • Law of Conservation of Energy • Temperature • Thermal Energy • Potential Energy • Kinetic Energy • Open System • Closed System • Isolated System • Endothermic • Exothermic • Surroundings Key Terms

  3. The study of energy changes that accompany physical or chemical changes in matter • All thermodynamics depends on the LAW OF CONSERVATION OF ENERGY • Changes that occur in matter may be classified as physical, chemical or nuclear • Simpsons & thermodynamics (video) What is Thermochemistry?

  4. Energy cannot be created or destroyed…but it can change forms (see the pic) and often it is ‘LOST’…as heat • the total energy of a system and its surroundings remains the same Law of Conservation of Energy

  5. Thermodynamics

  6. Exothermic – energy (heat - q) is released to the environment Feels HOT! • Endothermic – energy (think heat) is absorbed from the environment. • Feels COLD! Exothermic vs. Endothermic DEMOS

  7. Large , heavy nuclei are formed when small atomic massed atoms combine. • Eg. THE SUN!! Nuclear Energy - Fusion

  8. When smaller nuclei are formed as a result of the splitting of heavier atomic masses. • Eg. NUCLEAR REACTORS! Nuclear Energy - Fission

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