F322 - Module 3

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Enthalpy
The heat content that is stored in a chemical system.
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Exothermic
Refers to a 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
Refers to a 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
A diagram for a reaction to compare the enthalpy of the reactants with the enthalpy of the products.
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Activation energy
The minimum energy required to start a reaction by the breaking of the bonds.
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Standard conditions
100kPa, 298K, 1.0 moldm-3.
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Enthalpy change of reaction
Enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions.
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Enthalpy change of combustion
Enthalpy change when 1 mole of substance reacts completely with oxygen under standard conditions.
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Specific heat capacity
The energy required to raise the temperature of 1g of a substance by 1°C.
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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 bond in the molecules of a gaseous species.
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Hess' Law states....
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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Heterogeneous catalysis
Catalysis of a reaction in which the catalyst has a different physical state from the reactants.
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Homogeneous catalysis
Catalysis of a reaction in which the catalyst and reactants are in the same physical state.
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Boltzmann distrubution
The distribution of energies of molecules at a particular temperature, often shown as a graph.
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Le Chatelier's principle states....
When a system in dynamic equilibrium is subjected to a change, the position of the equilibrium will shift to minimise the change.
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Other cards in this set

Card 2

Front

Refers to a 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

Refers to a 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

Preview of the back of card 3

Card 4

Front

A diagram for a reaction to compare the enthalpy of the reactants with the enthalpy of the products.

Back

Preview of the back of card 4

Card 5

Front

The minimum energy required to start a reaction by the breaking of the bonds.

Back

Preview of the back of card 5
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