Reactions that absorb heat are called __________________ * Assignment #1 Determine if the following processes are endothermic or exothermic? Then Explain why. When solid potassium bromide (endo or exo) is dissolved in water (endo or exo), the solution gets colder. Natural gas ( CH4 ) is burned (endo or exo) in a furnace to heat the house (endo or exo). When concentrated H2SO4 (endo or exo) is added to water (endo or exo), the solution gets very hot. Water (endo or exo) is boiled in a teakettle while sitting on the stove (endo or exo). “element” Podcast 4.3: Enthalpy Enthalpy is a State Function The value for a state function depends only on Enthalpy, H, is also a state function ___________________ Function accounts for H = = ΔH for a gas => work = = ΔE SO… = ΔH Change in enthalpy = Enthalpies of Rxn = ΔH So… = ΔH this can also be called the heat of reaction or ΔHrxn IF… is - => __________________________ ΔH is + => __________________________ ΔH Thermochemical Equations a chemical reaction that shows Example Calculations with Enthalpy
Reactions that absorb heat are called __________________ * Assignment #1 Determine if the following processes are endothermic or exothermic? Then Explain why. When solid potassium bromide (endo or exo) is dissolved in water (endo or exo), the solution gets colder. Natural gas ( CH4 ) is burned (endo or exo) in a furnace to heat the house (endo or exo). When concentrated H2SO4 (endo or exo) is added to water (endo or exo), the solution gets very hot. Water (endo or exo) is boiled in a teakettle while sitting on the stove “element” (endo or exo). Podcast 4.3: Enthalpy Enthalpy is a State Function The value for a state function depends only on Enthalpy, H, is also a state function ___________________ Function accounts for H = ΔH = for a gas => work = ΔE = SO… ΔH = Change in enthalpy = Enthalpies of Rxn ΔH = So… ΔH = this can also be called the heat of reaction or ΔHrxn IF… ΔH is - => __________________________ ΔH is + => __________________________ Thermochemical Equations a chemical reaction that shows Example Calculations with Enthalpy
ap_chem_unit_3_thermochem_student_packet.docx