reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants - loss to the surroundings
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Endothermic
Reaction in which the enthalpy of products is greater than the enthalpy of the reactants - heat taken in from the enviroment
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Activation energy
Minimum energy required to start a reaction by breaking of bonds
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Standard Conditions
100 kPa(1 atmosphere, 298K(25C) and 1 mol if aqueous
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Standard State
Physical state of a substance under standard conditions
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Standard Enthalpy of Reaction
Enthalpy change that accompanies a reaction in the molar quantaties expressed in a chemical equation under standard conditions, all reactants and products in their standard states
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Standard Enthalpy of Combustion
Enthalpy change that accompanies a reaction when 1 mole of a substance reacts completely with Oxygen under standard conditions, all reactants and products in their standard states
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Standard Enthalpy of Formation
Of a compound is the enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their under standard conditions, all reactants and products in their standard states
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Specific heat capacity, c
The energy required in order to raise the temperature of 1g of a substance by 1 Celsius
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Bond enthalpy
Energy 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
The average enthalpy change that takes place when breaking by homolyric 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 routes
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Rate of reaction
Change in concerntration of a reactant or a product in a given time
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Heterogeneous Catalyst
Catalyst of a reaction in which the catalyst has a different physical state from the reactants, frequently reactants are gases whilst the catalyst is a solid
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Homogeneous Catalyst
Catalyst of a reaction in which the catalyst and reactants are in the same physical state, which is most frequently in the aqueous or gaseous state
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Le Chatelier's Principle
When a system is in dynamic equilibrium is subjected to a change, the position of the equilibrium will shift to minimize the change
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Dynamic Equilibrium
The equilibrium that exists in a closed system when the rate of the foward reaction is equal to the rate of the reverse reaction
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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 - loss to the surroundings
Back
Exothermic
Card 3
Front
Reaction in which the enthalpy of products is greater than the enthalpy of the reactants - heat taken in from the enviroment
Back
Card 4
Front
Minimum energy required to start a reaction by breaking of bonds
Back
Card 5
Front
100 kPa(1 atmosphere, 298K(25C) and 1 mol if aqueous
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