Enthalpy and equilibria definitions

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  • Created by: Afion
  • Created on: 20-04-16 19:48
Dynamic equilibrium
The equilibrium that exists in a closed system, where the rates of the forward and reverse reactions are equal and the concentration of reactants and products are constant
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Le Chatelier's principle
When a system in dynamic equilibrium is subjected to a change, the position of equilibrium will shift to minimise the change
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Activation energy
The minimum energy required by reactants to react to form products
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Catalyst
A substance that increases the rate of reaction, without being used up in the process, by providing an alternative reaction path with a lower activation energy
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Enthalpy
Heat energy stored within a chemical system
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Enthalpy change
Heat exchange with surroundings during a chemical reaction
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Enthalpy of combustion
The exothermic heat change which accompanies the complete combustion of one mole of a substance
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Enthalpy of neutralisation
The exothermic heat change which accompanies the formation of one mole of water when an acid and a base react
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Average bond enthalpy
The endothermic heat change required to break one mole of covalent bonds in gaseous molecules, averaged over a range of molecules containing that bond
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Enthalpy change of formation
The heat change which accompanies the formation of one mole of a substance from its elememts
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Hess's law
The enthalpy change from reactant to product is the same, independent of the route taken
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Other cards in this set

Card 2

Front

When a system in dynamic equilibrium is subjected to a change, the position of equilibrium will shift to minimise the change

Back

Le Chatelier's principle

Card 3

Front

The minimum energy required by reactants to react to form products

Back

Preview of the back of card 3

Card 4

Front

A substance that increases the rate of reaction, without being used up in the process, by providing an alternative reaction path with a lower activation energy

Back

Preview of the back of card 4

Card 5

Front

Heat energy stored within a chemical system

Back

Preview of the back of card 5
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