All Flashcards
What is Bond Dissociation Energy (BDE)?
The energy required to break a specific bond in the gas phase.
Define 'endothermic' in the context of bond energetics.
A process that requires energy input, such as breaking a bond.
Define 'exothermic' in the context of bond energetics.
A process that releases energy, such as forming a bond.
What is the relationship between bond order and bond dissociation energy?
Higher bond order (e.g., triple bond) generally corresponds to higher bond dissociation energy.
Define enthalpy of reaction () using bond dissociation energies.
The difference between the sum of the energies required to break bonds in reactants and the sum of the energies released by forming bonds in products: .
What is the effect of increasing bond order on bond strength?
Increasing bond order (single to double to triple) increases bond strength.
What is the effect of a negative value?
The reaction is exothermic, meaning it releases heat.
What is the effect of a positive value?
The reaction is endothermic, meaning it requires heat.
What are the steps to calculate using BDEs?
- Break all bonds in reactants. 2. Form all bonds in products. 3. Sum BDEs of bonds broken. 4. Sum BDEs of bonds formed. 5. Apply the formula: .