Section 1 : Enthalpy Changes and Bond Enthalpy
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9 Terms
Define Enthalpy change
Heat energy transferred in a reaction at constant pressure.
What are the Standard Conditions
100 kPa
298 K
All elements are in their standard states
What affects the enthalpy change
Temperature
Pressure
What will be the energy change in exothermic reactions?
Negative
What are the features of endothermic reaction?
Energy is taken from the surroundings
Products of reaction have more energy than the reactants.
Energy change is positive
What is Activation Energy
Minimum amount of energy needed to break bonds and therefore a chemical reaction to take place.
Define Bond dissociation Enthalpy
The amount of energy needed to break bonds per mole.
Why is it easier to break the second OH bond in H2O
It has got an extra electron repulsion
Formula to calculate Enthalpy change
Enthalpy Change = Bonds formed - Bonds broken
Note 
Flashcards (24)