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chapter 5, Thermochemical equation -heat term is included on products side of the reaction A + B = C + D + energy Ex:B(g)→B(s) + 50kJ Enthalpy Term -include seperate term beside equation ΔHreaction = negative value* A + B → C + D ΔH= - Ex:A +B →C + D ΔH= -50kJ Enthalpy Diagram -products above reactant C+D (products) A+B ( reactant), Thermochemical definitions System that part of the Universe whose change we are going to measure, Thermochemical equation -heat term is on the reactants side of the equation A + B + energy → C + D Ex:B(L) + 2C(ℓ) + 100kJ → D(ℓ) Enthalpy Term -include seperate term beside equation ΔHreaction = positive value* A + B → C + D ΔH= + Ex:B(ℓ) +2C(ℓ) →D ΔH= 100kJ Enthalpy Diagram -products above reactant C+D (products) A+B ( reactant), Energy kinds solar, the total energy of chemical spesies in the reactant will be different than in the product. The difference between these, we call the enthalpy of the reaction. An enthalpy change can be either positive or negative Endothermic (absorb energy) Thermochemical equation -heat term is on the reactants side of the equation A + B + energy → C + D Ex:B(L) + 2C(ℓ) + 100kJ → D(ℓ), Energy kinds electrical, Energy and change 5.1-The energy of physical, chemical, and nuclear processes Enthalpy and Enthalpy change, that part of the Universe whose change we are going to measure kinds Closed Systems ~exchange only energy with their surroundings, Energy and change 5.1-The energy of physical, chemical, and nuclear processes Thermochemical definitions, heat, Q same units as energy - joules (J) from a hotter object to a cooler object