Heat & Thermochemical Equations

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Presentation transcript:

Heat & Thermochemical Equations Chapter 16-3

Enthalpy 17.2 The heat content of a system at constant pressure is the same as a property called the enthalpy (H) of the system.

Themochemical Equation 17.2 Thermochemical Equations In a chemical equation, the enthalpy change for the reaction can be written as either a reactant or a product. A chemical equation that includes the enthalpy change is called a thermochemical equation.

Thermochemical Equations 17.2 The heat of reaction is the enthalpy change for the chemical equation exactly as it is written.

Thermochemical Equations 17.2 These enthalpy diagrams show exothermic and endothermic processes: a) the reaction of calcium oxide and water and b) the decomposition of sodium bicarbonate. Identifying In which case is the enthalpy of the reactant(s) higher than that of the product(s)? Exothermic Reaction

Thermochemical Equations 17.2 These enthalpy diagrams show exothermic and endothermic processes: a) the reaction of calcium oxide and water and b) the decomposition of sodium bicarbonate. Identifying In which case is the enthalpy of the reactant(s) higher than that of the product(s)? Endothermic Reaction