Enthalpy Change Deffinitions

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An exothermic reaction is
A reaction where heat is released from the system signified by a tempreture increase and the product has a lower enthalpy than the reactants
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An endothermic reaction is
A reaction where heat is gained by the system signified in a tempreture decrease and the products enthalpy is greater than the reactants
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Breaking chemical bonds and attractions is
Endothermic
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Activiation energy is
The minimum amount of energy required by the reactants in order to form the products
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Standard thermochemical conditions are
100kPa, 298k (25 degrees C) and 1 mol dm-3 concnetration
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Enthalpy change of combustion is
The exothermic heat change which accompanies the complete combustion of one mole of a substance
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Enthalpy change of formation is
The heat chnage which accompamies the formation of one mole of a substance from its elements in their normal states
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Enthalpy change of neutrilisation is
The exothermic heat chnage which accompanies the production of one mole of water when an acid reacts with an alkali
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Calorimetry calculations
Q= mc(delta T) and (delta H)=Q/n
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Give 2 reasons why experimental results of the determination of enthalpy chnage and combustion is very inaccurate
incomplete combustion and heat loss surrounding the experiment
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Average bond enthalpies are
The endothermic heat change to break one mole of covalent bonds in gaseous molecules averaged over a range of molecules with that same bond
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equation for calculating bond enthalpies
(delta H)= sum of Bonds broken-sum of bonds made
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State Hess' law
The total enthalpy change from the reactants to products is the same inderpendant of the rout taken
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Card 2

Front

A reaction where heat is gained by the system signified in a tempreture decrease and the products enthalpy is greater than the reactants

Back

An endothermic reaction is

Card 3

Front

Endothermic

Back

Preview of the back of card 3

Card 4

Front

The minimum amount of energy required by the reactants in order to form the products

Back

Preview of the back of card 4

Card 5

Front

100kPa, 298k (25 degrees C) and 1 mol dm-3 concnetration

Back

Preview of the back of card 5
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