The heat content that is stored in a chemical system.
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Enthalpy change, ΔH
Difference in enthalpy between the reactants and products in a reaction.
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Average bond enthalpy
The average bond enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond in the molecule of a gaseous species.
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Standard enthalpy of combustion
The enthalpy change that takes place when 1 mole of of a substance reacts completely with oxygen under standard conditions all reactants and products being in their standard states.
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Standard enthalpy change of formation
The enthalpy change that takes place when 1 mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.
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Standard enthalpy change of neutralisation
The enthalpy chnage that accompanies the reaction of an acid by a base o form one mole of H2O(l), under standard conditions, with all reactants and products in their standard states.
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Enthalpy cycle
A diagram for a reaction to compares the enthalpy of the reactants with the enthalpy of the products.
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Specific heat capacity
The energy required to raise the temperature of 1g of a substance by 1K
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Hess' Law
If a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route.
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Endothermic reaction
A reaction in which the enthaply of the products is greater than the enthalpy of the reactants, resulting in heat being taken in from the surroundings (ΔH is positive)
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Exothermic reaction
A reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants, resulting in heat loss to the surroundings. (ΔH is negative)
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Other cards in this set
Card 2
Front
Difference in enthalpy between the reactants and products in a reaction.
Back
Enthalpy change, ΔH
Card 3
Front
The average bond enthalpy change that takes place when breaking by homolytic fission 1 mole of a given type of bond in the molecule of a gaseous species.
Back
Card 4
Front
The enthalpy change that takes place when 1 mole of of a substance reacts completely with oxygen under standard conditions all reactants and products being in their standard states.
Back
Card 5
Front
The enthalpy change that takes place when 1 mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.
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