Spontaneous Reactions and Enthelpy

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SUMMARY

This discussion focuses on the principles of entropy and spontaneous reactions in the context of AP Chemistry. It clarifies that reactions do not create energy, adhering to the first law of thermodynamics, which states that energy is conserved. Exothermic reactions release stored energy from reactants, resulting in products with lower energy levels. Understanding these concepts is crucial for grasping the nature of spontaneous reactions.

PREREQUISITES
  • Understanding of the first law of thermodynamics
  • Basic knowledge of exothermic and endothermic reactions
  • Familiarity with concepts of entropy
  • General principles of chemical reactions
NEXT STEPS
  • Study the relationship between entropy and spontaneity in chemical reactions
  • Explore detailed examples of exothermic reactions and their energy profiles
  • Learn about Gibbs free energy and its role in predicting spontaneity
  • Investigate the implications of the second law of thermodynamics on reaction spontaneity
USEFUL FOR

Students in AP Chemistry, educators teaching thermodynamics, and anyone interested in understanding the principles of energy conservation in chemical reactions.

LordWillO
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Today in AP Chemistry we started learning about entropy and spontaneous reactions. Could someone explain on an undergraduate level (preferably not using calculus) how, if the universe has a fixed amount of mass and energy, that reactions can be spontaneous and create their own energy? Thanks!
 
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Reactions don't create energy. There is the first law of thermodynamics which says that energy is conserved. If a reaction is exothermic, heat is given off in the course of the reaction. However this type of energy was stored in the reactands. The products of the reaction have less energy.
 

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