Molecular Orbital Theory
Chemistry ⇒ Chemical Bonding and Structure
Molecular Orbital Theory starts at 11 and continues till grade 12.
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Calculate the bond order of the NO molecule using molecular orbital theory.
Calculate the number of unpaired electrons in the O2 molecule according to molecular orbital theory.
Describe the difference between bonding and antibonding molecular orbitals.
Describe the difference in the order of molecular orbitals for molecules with atomic number less than 8 and those with atomic number 8 or more.
Describe the main limitation of molecular orbital theory when applied to polyatomic molecules.
Describe the significance of bond order in molecular orbital theory.
Explain why F2 has a lower bond order than O2 according to molecular orbital theory.
Explain why the bond order of H2- is less than that of H2.
Which of the following best explains why O2 is paramagnetic? (1) It has unpaired electrons in its π2p* orbitals. (2) It has all electrons paired. (3) It has unpaired electrons in its σ2p orbital. (4) It has no electrons in antibonding orbitals. (1)
Which of the following ions has the highest bond order? (1) O2+ (2) O2 (3) O2- (4) O22- (1)
Which of the following is NOT a postulate of molecular orbital theory? (1) Atomic orbitals combine to form molecular orbitals. (2) The number of molecular orbitals formed equals the number of atomic orbitals combined. (3) Electrons in molecular orbitals are localized between two atoms. (4) Molecular orbitals are filled according to the Aufbau principle. (1)
Which of the following is the correct bond order for the B2 molecule? (1) 1 (2) 2 (3) 3 (4) 0 (1)
Fill in the blank: The antibonding molecular orbital is denoted by a _______ symbol.
Fill in the blank: The molecular orbital formed by head-on overlap of two p orbitals is called a _______ molecular orbital.
Fill in the blank: The molecular orbital formed by the sideways overlap of two p orbitals is called a _______ molecular orbital.
Fill in the blank: The molecular orbital theory explains the _______ nature of O2, which cannot be explained by valence bond theory.
State whether the following statement is true or false: The bond order of a molecule can be a fraction.
State whether the following statement is true or false: The bond order of a molecule can be zero.
State whether the following statement is true or false: The bond order of a molecule is always a whole number.
State whether the following statement is true or false: The bond order of N2 is 3.
