CHEM 110 1 Recitation 14 Recitation 14 Learning Objectives Thermochemistry Internal energy and the First Law • Know the difference between kinetic and potential energy. Be able to give examples of the different kinds of energy. • Know units of energy and order of magnitude of different kinds of energies (photon energy, etc.) • Know how chemical energy is stored ion molecules. • Know what is meant by electronic energy (energy of electrons and energy associated with electron transitions) • What is the First Law of Thermodynamics? • What is meant by the system? The surroundings? • What is internal energy? What is heat and work? ( Δ E = q + w) • What does the “sign” of energy mean? + means energy (= q + w) into the system (endothermic = q into system) − means energy (= q + w) out of the system (exothermic = q out of the system) • What is a State function? Be able to give some examples? Why is it useful to know that these are state functions? Enthalpy and heats of reactions
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