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Exam 9: Covalent Bonding: Orbitals

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Question 1

Multiple Choice

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Which charge(s) on an O₂ ion would give a bond order of 2.5?

A) -2
B) -1
C) +1
D) two of these
E) none of these

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Question 2

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How many of the following: F₂,B₂,O₂,N₂ ,are paramagnetic?

A) 0
B) 1
C) 2
D) 3
E) 4

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Question 3

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Tetracyanoethylene has the skeleton shown below: From its Lewis structure determine the following: -How many of the atoms are sp² hybridized?

The hybridization of the carbon atom in the cation CH₃⁺ is:

Which of these statements about benzene is true?

How many unpaired electrons in the F₂²⁺ ion are based on molecular orbital theory? The order of the molecular orbitals are ( $\sigma$ _2s) ( $\sigma$ *_2s) ( $\sigma$ _2p) ( $\pi$ _2p) ( $\pi$ *_2p) ( $\sigma$ *_2p) .

__________ causes a substance to be attracted into the inducing magnetic field.

Which of the following statements about the molecule BN is false?

The hybridization of the central atom in XeF₅⁺ is:

For how many of the following does bond order decrease if you take away one electron from the neutral molecule? B₂,C₂,P₂,F₂

Which of the following has the shortest bond length?

The number of molecular orbitals formed is always __________ the number of atomic orbitals combined.

The hybridization of the central atom in ClF₂⁺ is:

Consider three molecules - A,B,C.Molecule A has a hybridization of sp³.Molecule B has two more effective pairs (electron pairs around the central atom)than molecule A.Molecule C consists of one $\sigma$ bond and two $\pi$ bonds.Give the molecular structure,hybridization,bond angles,and an example for each molecule.

Sulfur trioxide is known to be planar with all the oxygen atoms equidistant from the central sulfur atom.On the basis of these facts,which of the following conclusions may be drawn concerning this molecule? I.It can be represented by three equivalent resonance structures. II.The dipoles associated with each S-O bond are equal in magnitude. III.The sulfur atom is sp² hybridized.

The hybridization of the central atom,Al,in AlBr₃ is

Tetracyanoethylene has the skeleton shown below: From its Lewis structure determine the following: -How many sigma and pi bonds are in the molecule?

Which of the following statements is false?

How many electrons are involved in pi bonding in benzene,C₆H₆?

Use the molecules below to answer the next three questions. -Which molecule(s) have equivalent C-C bonds throughout the molecule?