15 - changes Some Thermodynamic Terms The substances...

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15 Chemical Thermodynamics The First Law of Thermodynamics Exothermic reactions release energy in the form of heat. For example, the combustion of propane is exothermic. The First Law of Thermodynamics For an exothermic reaction, the potential energies of the products are lower than the potential energies of the reactants. The combustion of n-butane is also exothermic. The First Law of Thermodynamics The First Law of Thermodynamics This law can be stated as, “The total energy in the universe is constant.” The First Law of Thermodynamics is also known as the Law of Conservation of Energy - law states that energy is neither created nor destroyed in chemical reactions and physical
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Unformatted text preview: changes. Some Thermodynamic Terms The substances involved in the chemical and physical changes under investigation are called the system . In chemistry lab, the system is the chemicals inside the beaker. Some Thermodynamic Terms The environment around the system is called the surroundings (surroundings are outside the beaker). The system plus the surroundings is called the universe . The set of conditions that specify all of the properties of the system is called the thermodynamic state of a system . Enthalpy Change ∆ H rxn is the heat of reaction and it tells us if the reaction produces or consumes heat....
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