Bond Enthalpies
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6 Terms
What is the simplified process of chemical reactions?
energy is absorbed
bonds are broken
energy absorbed
bonds are formed
energy released
Define Bond Enthalpy
quantity of energy needed to break one mole of bonds in gaseous molecules under standard conditions, via homolytic fission
Which process is endothermic?
• a. 2Cl (g) —> Cl2 (g)
• b. Na (g) —> Na+ (g) + e-
• c. Na+ (g) + Cl- (g) —> NaCl (s)
• d. Na (g) —> Na (s)
b. Na (g) —> Na+ (g) + e-
the stronger the bond…
the shorter the length of the bond
How do you get ∆H Using Bond Enthalpies?
△H
= sum of energy added per mole (reactants) + sum of energy released per mole (products)
= n(ΣBE bonds broken) - n(Σ BE bonds formed)
= ΣB.E.reactants - Σ B.E. products
What are the steps to calculate Bond Enthalpy?
Write your balanced chemical equation
Draw the simplified Lewis structures of reactants and products.
Use these values to determine the enthalpy change.
