3.1.4.1 - Enthalpy change
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7 Terms
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Enthalpy change
The heat energy transferred in a reaction at constant pressure
Symbol: ΔH
Units: kJ mol⁻¹
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Standard conditions
Pressure: 100kPa
Temperature: stated in method
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What does ΔH⦵ mean?
Substances in standard states and measurement made under standard conditions
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Exothermic reaction
Give out energy
Negative ΔH
Temp increases
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Endothermic reaction
Absorb energy
Positive ΔH
Temp decreases
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Standard enthalpy of combustion
Enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions
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Standard enthalpy of formation
Enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions