Course review

1.1 Measuring enthalpy changes

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Learning objective

1.1.1—Energy transfer

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• Chemical reactions transfer energy between system and surroundings • Total energy conserved • Heat vs. temperature

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Learning objective

1.1.2—Endothermic vs. exothermic

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• Endothermic: energy absorbed (T decreases) • Exothermic: energy released (T increases)

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Learning objective

1.1.3—Stability and energy

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• Relative stability determines endo/exothermic nature • Energy profiles • Sketch and interpret labelled energy profiles for endothermic and exothermic reactions

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Learning objective

1.1.4—Standard enthalpy change (ΔH⦵)

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• Heat transferred at constant pressure, standard conditions • Q = mcΔT • ΔH = −Q/n • Calculate enthalpy change from calorimetry data

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