Enthalpy Changes

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Exothermic reaction
A reaction in which heat is released from the system (H of reactants is greater than H of products)
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Endothermic reaction
A reaction in which heat is gained by the system (H of products is greater than H of reactants)
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Breaking chemical bonds and attractions is...
Endothermic
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Making chemical bonds and attractions is...
Exothermic
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Activation energy
The minimum energy required by reactants in order to form products
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Standard condition
100kPa pressure, 298K temperature, 1moldm-3 concentration
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Enthalpy change of combustion
The exothermic heat change which accompanies is the complete combustion of one mole of a substance
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Enthalpy change of formation
The heat change which accompanies the formation of one mole of a substance from its elements in their normal states
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The value of enthalpy change of formation of any element
Elements have an enthalpy change of formation of zero
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Enthalpy change of neutralisation
The exothermic heat change which accompanies the production of one mole of water when an acid reacts with an alkali or base
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Why is experimental determination of an enthalpy change of combustion innacurate?
Incomplete combustion, heat loss to surroundings
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Average bond enthalpy
The endothermic heat change to break one mole of covalent bonds in gaseous molecules averages over a range of molecules with that bond
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Hess' law
The total enthalpy change from reactants to products is the same independent of the route taken
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Other cards in this set

Card 2

Front

A reaction in which heat is gained by the system (H of products is greater than H of reactants)

Back

Endothermic reaction

Card 3

Front

Endothermic

Back

Preview of the back of card 3

Card 4

Front

Exothermic

Back

Preview of the back of card 4

Card 5

Front

The minimum energy required by reactants in order to form products

Back

Preview of the back of card 5
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