University:
Boston University
Course:
CAS PY 105 | Physics 1
Academic year:

2022
Views:

405

Pages:

4
Author:

perlesdesfees9ovd

Bond order and bond energy [TP] Which of the following has the highest bond order? 0% 0% 0% 0% 0% 0% 1. 2. 3. 4. 5. 6. Li22+ Li2+ Li2− Li22− Li2+ and Li2− Li22+ and Li22− 0 of 5 Bond order and bond energy The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. Draw the correlation diagram. 1 Bond order and bond energy The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. X2+ has one electron in the σ MO and none in the σ* MO. Calculate the bond order of X2+. Calculate the bond energy of X2+. Efar = 1 x (−10 eV) = −10 eV Eclose = 1 x (−12 eV) = −12 eV Bond strength = Efar – Eclose = +2 eV Bond order and bond energy The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. X2− has two electrons in the σ MO and one in the σ* MO. Calculate the bond order of X2−. Calculate the bond energy of X2−. Efar = 2 x (−10 eV) + 1 x (−10 eV) = −30 eV Eclose = 2 x (−12 eV) + 1 x (−7 eV) = −31 eV Bond energy = Efar – Eclose = +1 eV Bond order and bond strength The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. X2− has two electrons in the σ MO and one in the σ* MO. X2+ and X2− have the same bond order 1/2 X2 had bond strength 2 eV: X2+  X + X+ ΔE = 2 eV + X2− has bond strength 1 eV: X2−  X + X− ΔE = 1 eV 2 [TP] Which of the following has the largest bond energy? (the strongest bond)? Boston University Slideshow Title Goes Here 0% 0% 0% 0% 0% 0% 1. 2. 3. 4. 5. 6. X22+ X2+ X2− X22− X2+ and X2− X22+ and X22− [TP] Use the same approach we used for analysis of diatomic ions of X to determine which of the following has the largest bond energy (strongest bond)? Boston University Slideshow Title Goes Here 0% 0% 0% 0% 0% 0% 1. 2. 3. 4. 5. 6. Li22+ Li2+ Li2− Li22− Li2+ and Li2− Li22+ and Li22− Bond order and bond energy The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. X22+ has no electrons in the σ MO and none in the σ* MO. Calculate the bond order of X22+. Calculate ΔE for the reaction X22+  X+ + X+. Explain whether your answer makes physical sense. 3 Bond order and bond energy The lowest energy (most stable) s AO of atom X has energy Boston University Slideshow Title Goes Here −10 eV. X2 has a σ (bonding) MO of energy −12 eV and a σ* (an bonding) MO of energy −7 eV. X22− has two electrons in the σ MO and two in the σ* MO. Calculate the bond order of X22−. Calculate ΔE for the reaction X22−  X− + X−. Explain whether your answer makes physical sense.