Enthalpy Changes (AQA A-Level Chemistry): Flashcards
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Enthalpy change ()
Enthalpy change ()
Heat energy change at constant pressure
Sign of in endothermic reactions
Sign of in endothermic reactions
Positive
Sign of in exothermic reactions
Sign of in exothermic reactions
Negative
Standard pressure for enthalpy changes
Standard pressure for enthalpy changes
100 kPa
Standard temperature for enthalpy changes
Standard temperature for enthalpy changes
298 K (25°C)
Standard enthalpy of formation ()
Standard enthalpy of formation ()
Enthalpy change when 1 mole of compound forms from elements
for elements in standard states
for elements in standard states
Zero
Standard enthalpy of combustion ()
Standard enthalpy of combustion ()
Enthalpy change when 1 mole burns completely in oxygen
Negative indicates
Negative indicates
Exothermic reaction
Standard states
Standard states
Most stable form of substance under standard conditions