Reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants,resulting in heat loss to the surroundings.
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Endothermic
Reaction in which the enthalpy of the products is greater than the enthalpy of the reactants,resulting in heat being taken in from the surroundings.
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Enthalpy profile diagram
Diagram for a reaction to compare the enthalpy of the reactants with the enthalpy of the products.
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Activation energy
Minimum energy required to start a reaction by the breaking of bonds
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Standard conditions
A pressure of 100kPa(1 atmosphere) and a temperature of 298K
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Standard state
Physical state of a substance under the standard conditions
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Standard enthalpy change of combustion
Enthapy change that takes place when one mole 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
Enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions
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Specific heat capacity
Energy required to raise the temperature of 1g of a substance by 1 degree celcius
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Bond enthalpy
Enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecules of a gaseous species
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Average bond enthalpy
Average enthalpy change that takes place when breaking by homolytic fission 1 mol of a given type of bond in the molecules of a gaseous species.
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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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Enthalpy cycle
Diagram showing alternative routes between reactants andd products which allows the indirect determination of an enthalpy changes using Hess' law.
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Other cards in this set
Card 2
Front
Reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants,resulting in heat loss to the surroundings.
Back
Exothermic
Card 3
Front
Reaction in which the enthalpy of the products is greater than the enthalpy of the reactants,resulting in heat being taken in from the surroundings.
Back
Card 4
Front
Diagram for a reaction to compare the enthalpy of the reactants with the enthalpy of the products.
Back
Card 5
Front
Minimum energy required to start a reaction by the breaking of bonds
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