The total thermodynamic energy in a system (the system can be the reactants or products)
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Enthalpy Change
Change in energy in a system (units are kJmol-1)
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Standard States
The physical state (solid, liquid, gas) of a substance under standard condition
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Standard Enthalpy Changes
Change in heat energy at constant pressure measured at standard conditions
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Standard Enthalpy Change of Combustion
The enthalpy change when one mole of a substance is completely burnt in oxygen under standard conditions. (value will always be negative as burning always releases heat)
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Standard Enthalpy Change of Neutralisation
The enthalpy change when one mole of water is produced in a neutralisation reaction under standard conditions. (value is always negative)
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Standard Enthalpy Change of Formation
The enthalpy change when one mole of a compound is formed from its elements under standard conditions
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Standard Enthalpy of a Reaction
The enthalpy change when substances react together under standard conditions with the number of moles given by the equation for the reaction
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Conservation of Energy
Energy cannot be created or destroyed, only converted from one form to another
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Hess's Law
The enthalpy change for a reaction is independent of the route taken, provided the initial and final conditions are the same
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Bond Enthalpy
The energy required to break one mole of a given bond
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Average Bond Enthalpy
The energy required to break one mole of a given bond averaged over many compounds
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Other cards in this set
Card 2
Front
Reactions that take in heat energy
Back
Endothermic
Card 3
Front
The total thermodynamic energy in a system (the system can be the reactants or products)
Back
Card 4
Front
Change in energy in a system (units are kJmol-1)
Back
Card 5
Front
The physical state (solid, liquid, gas) of a substance under standard condition
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