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Unit 3 - Thermochemistry

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Annotated notes and lecture slides from the third unit of grade 12 chemistry, thermochemistry.

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White Oaks Secondary School
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Unit 3 - Chemistry Notes

,Thermochemical Equations

,Representing Enthalpy Changes
Enthalpy of Reaction, ΔHrxn
Enthalpy change of a chemical reaction (heat energy transferred)


Standard Enthalpy of Reaction, ΔHorxn
Heat energy transferred under standard conditions (298 K and 100 kPa)

, Representing Thermochemical Equations
Endothermic Reaction Exothermic Reaction

MgCO3 → MgO + CO2 ΔHo = 117.3 kJ C + O2 → CO2 ΔHo = -393.5 kJ

OR OR

MgCO3 + 117.3 kJ→ MgO + CO2 C + O2 → CO2 + 393.5 kJ
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