ENTHALPY
Exothermic Reaction
Endothermic Reaction
Product Have Lesser Energy than Reactants
Heat Released to the Surroundings
Products have more energy than reactants
Heat absorbed from surroundings
STANDARD ENTHALPY
Standard ENthalpy Of Transition
Standard ENthalpy Of Formation
Standard Enthalpy Of Reaction
Standard Bond Dissociation Enthalpy
Standard enthalpy change that accompanies a change in
physical state
The standard enthalpy change when one mole of compound is
formed from its elements in their reference states.
Standard bond dissociation enthalpy, ∆H° (A—B) is the
energy involves in breaking or forming a bond in standard state.
First Law of Thermodynamics - The first law of thermodynamics states that energy can be converted from one form to another but cannot be created or destroyed.
It is based on the law of conservation of energy.
Second Law of Thermodynamics - The second law of thermodynamic states that the entropy of the universe increases in spontaneous processes and remains unchanged during equilibrium processes
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Hess's Law :
Heat evolved or absorbed in a chemical process is the same whether the process takes place in one or multiple steps
Hess's Law can be calculated in two ways
1st way
2nd way
Standard Enthaply of transition
changes that accompanies a change in physical state
Standard Enthalpy Change of Reaction
∆rxnH° (units in kJ)= (product)-(reactant)
(not included) Hrxn calculation
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Formula could only be used with the standard enthalpies change formula can only be used with the standard elthalpies change of reacants and products
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